WSR 16-03-072
PERMANENT RULES
BUILDING CODE COUNCIL
[Filed January 19, 2016, 3:13 p.m., effective July 1, 2016]
Effective Date of Rule: July 1, 2016.
Purpose: Adoption and amendment of the 2015 International Energy Conservation Code (IECC)/Washington State Energy Code (WSEC) (Commercial), chapter 51-11C WAC. The rules adopt the 2015 edition of WSEC (Commercial) with amendments to incorporate requirements from the 2015 IECC (Commercial), and formatted to the 2015 IECC, to provide increased clarity and energy efficiency as required in RCW 19.27A.160.
Citation of Existing Rules Affected by this Order: Amending one hundred seventy-eight sections of chapter 51-11C WAC.
Statutory Authority for Adoption: RCW 19.27A.025, 19.27A.160.
Other Authority: RCW 19.27.074.
Adopted under notice filed as WSR 15-17-037 on August 12, 2015.
Changes Other than Editing from Proposed to Adopted Version: 1. Section C101.2 was modified to specify that temporary growing structures are classified as such only when portable mechanical or lighting equipment is used.
2. The definition of Certified Commissioning Professional was modified to cite some of the accrediting organizations.
3. The definition of Vertical Fenestration was modified to remove reference to opaque doors.
4. The definition of Skylight under "S" was deleted and a pointer inserted to reference the new definition under Fenestration.
5. Section C401.2 was modified to allow those using the Total Building Performance path to utilize options out of C406, if desired.
6. Section C402.1 was modified to include the missing item 3 referencing compliance with air leakage requirements.
7. Table C402.1.3 had the following modifications:
Both Option 1 and Option 2 were modified to be identical. The difference between the two options was the value for Mass walls. Both changes were rejected and the mass wall values from the 2012 WSEC were retained, along with the cited footnote.
The Roofs category: The R-value for Insulation entirely above deck was revised from R-30 to R-38 to coordinate with the change to the same category in Table C402.1.4.
8. Table C402.1.4: Similar to Table C402.1.3, above, the mass wall values from the 2012 WSEC were retained, along with the cited footnote.
9. Equation 4-3 was modified to include definitions left out of the draft; these were previously defined in another equation no longer present in the code.
10. Section C402.4.1.4 was modified to reflect the changes made to the dedicated outdoor air system requirements, previously in Section C403.2.6.1 and now in Section C403.6.
11. Section C402.4.2 shows editorial changes to align terms and language related to the various forms of daylighting.
12. Section C402.5.1.2 was modified to provide better clarity.
13. Section C402.5.4 was modified to delete a reference to a section that no longer exists.
14. Section C402.5.7 was modified to include a previous exception for vehicle doors that was mistakenly left out of the model code and reinstated via errata.
15. Table C403.2.3(8) was modified to correct computer translation errors in the performance column and a transposition of standard numbers in the test procedure column.
16. Section C403.2.4 was modified with clearer, more generic language.
17. Section C403.2.4.1 was modified to delete extraneous language posing as exception 2.
18. Section C403.2.6 was modified to allow for increased outdoor air rates for particulate or VOC dilution.
19. Proposed Section C403.2.6.1, DOAS, was moved from the Mandatory provisions of C403.2 to a Prescriptive Section C403.6. The new section is also optional until July 1, 2017. Two exceptions were also added for (1) buildings utilizing natural ventilation and (2) high efficiency VAV systems. A new section (C403.7) was added detailing the requirements for a high efficiency VAV system. The original C403.2.6.1 was divided into two sections, scoping (C403.6) and ERV requirements (C403.6.1). The allowance for DCV was moved into an exception, and another exception was added for makeup air systems. The heating/cooling system fan controls section (was previously C403.2.6.1.2; now C403.6.2) was moved in front of the impracticality section (previously C403.2.6.1.1, now C403.6.3).
20. Section C403.2.11.3 was modified to strike the requirement for fans to be certified by an independent testing laboratory.
21. Section C403.2.11.4 was modified to exempt HRV and intermittently operated fans from the efficacy requirements.
22. Missing Table C403.3, referenced in Section C403.3 exception 3, was added.
23. Section C403.5.1, exception 8 was corrected (exceeds becomes less than) and clarified.
24. Section C403.6 and C403.7. See item 19.
25. Table C404.2 was modified to reflect the changes shown in the ASHRAE 90.1-2014 errata.
26. Section C405.2.2 was modified to correlate with the option offered for switching under Section C405.2.6.
27. Section C405.2.4.1, Item 6 exception, was modified for clarity and ease of use. Item 9 was added for clarification.
28. Section C405.2.6.1 was modified for clarity.
29. Section C405.8 was modified by adding language to the exceptions to clarity where fan efficacy requirements apply.
30. Sections C406.2.1 and C406.2.2 were modified to allow additional technologies know [known] to be effective but which are not listed in the cited tables.
31. Missing Table C406.5, referenced in Section C406.5, was added, and it also includes provisions for multifamily residential.
32. Section C406.6 was modified to coordinate with the changes made to the DOAS provisions noted in Items 19 and 24.
33. Section C407.3 was modified to allow those using the Total Building Performance path to utilize options out of C406, if desired. See also Item 5.
34. Section C503.4 was modified by adding an exception stating that existing mechanical systems do not need to comply with the DOAS provisions unless cooling is added to the system.
35. Table A103.3.7.1(1) was modified to correct calculation errors and adds values for two more wall types.
36. Section AE101.1 was modified to clarify the use of the exception.
A final cost-benefit analysis is available by contacting Tim Nogler, P.O. Box 41449, Olympia, WA 98504-1449, phone (360) 407-9280, fax (360) 586-9088, e-mail sbcc@ga.wa.gov.
Number of Sections Adopted in Order to Comply with Federal Statute: New 0, Amended 0, Repealed 0; Federal Rules or Standards: New 0, Amended 0, Repealed 0; or Recently Enacted State Statutes: New 0, Amended 0, Repealed 0.
Number of Sections Adopted at Request of a Nongovernmental Entity: New 25, Amended 178, Repealed 0.
Number of Sections Adopted on the Agency's Own Initiative: New 0, Amended 0, Repealed 0.
Number of Sections Adopted in Order to Clarify, Streamline, or Reform Agency Procedures: New 0, Amended 0, Repealed 0.
Number of Sections Adopted Using Negotiated Rule Making: New 0, Amended 0, Repealed 0; Pilot Rule Making: New 0, Amended 0, Repealed 0; or Other Alternative Rule Making: New 26, Amended 178, Repealed 0.
Date Adopted: November 20, 2015.
November 20, 2015
Steve Simpson
Council Chair
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-10100 Section C101Scope and general requirements.
C101.1 Title. This code shall be known as the ((International Energy Conservation Code of [NAME OF JURISDICTION])) Washington State Energy Code, and shall be cited as such. It is referred to herein as "this code."
C101.2 Scope. This code applies to commercial buildings and the buildings sites and associated systems and equipment.
EXCEPTION:
The provisions of this code do not apply to temporary growing structures used solely for the commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. (("Temporary growing structure" means a structure that has the sides and roof covered with polyethylene, polyvinyl, or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention.)) A temporary growing structure is not considered a building for the purposes of this code. However, the installation of other than listed, portable mechanical equipment or listed, portable lighting fixtures is not allowed.
C101.3 Intent. This code shall regulate the design and construction of buildings for the ((effective)) use and conservation of energy over the ((useful)) life of each building. This code is intended to provide flexibility to permit the use of innovative approaches and techniques to achieve this objective. This code is not intended to abridge safety, health or environmental requirements contained in other applicable codes or ordinances.
AMENDATORY SECTION (Amending WSR 14-24-122, filed 12/3/14, effective 1/3/15)
WAC 51-11C-10140 Section C101.4Applicability.
C101.4 Applicability. Where, in any specific case, different sections of this code specify different materials, methods of construction or other requirements, the most restrictive shall govern. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall govern.
C101.4.1 ((Existing buildings. Except as specified in this chapter, this code shall not be used to require the removal, alteration or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code.
C101.4.2 Historic buildings. The building official may modify the specific requirements of this code for historic buildings and require alternate provisions which will result in a reasonable degree of energy efficiency. This modification may be allowed for those buildings or structures that are listed in the state or national register of historic places; designated as a historic property under local or state designation law or survey; certified as a contributing resource with a national register listed or locally designated historic district; or with an opinion or certification that the property is eligible to be listed on the national or state registers of historic places either individually or as a contributing building to a historic district by the state historic preservation officer or the keeper of the national register of historic places.
C101.4.3 Additions, alterations, renovations or repairs. Additions, alterations, renovations or repairs to an existing building, building system or portion thereof shall conform to the provisions of this code as they relate to new construction without requiring the unaltered portion(s) of the existing building or building system to comply with this code. Additions, alterations, renovations or repairs shall not create an unsafe or hazardous condition or overload existing building systems. An addition shall be deemed to comply with this code if the addition alone complies or if the existing building and addition comply with this code as a single building.
EXCEPTION:
The following need not comply provided the energy use of the building is not increased:
 
1. Storm windows installed over existing fenestration.
 
2. Glass only replacements in an existing sash and frame.
 
3. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are insulated to full depth with insulation having a minimum nominal value of R-3.0 per inch installed per Section C402.
 
4. Construction where the existing roof, wall or floor cavity is not exposed.
 
5. Reroofing for roofs where neither the sheathing nor the insulation is exposed. Roofs without insulation in the cavity and where the sheathing or insulation is exposed during reroofing shall be insulated either above or below the sheathing.
 
6. Replacement of existing doors that separate conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided, however, that an existing vestibule that separates a conditioned space from the exterior shall not be removed.
 
7. Alterations to lighting systems only that replace less than 60 percent of the luminaires in a space, provided that such alterations do not increase the installed interior lighting power.
 
8. Alterations that replace only the bulb and ballast within the existing luminaires in a space provided that the alteration does not increase the installed interior lighting power.
C101.4.3.1 Lighting and motors. Alterations that replace 60 percent or more of the luminaires in a space enclosed by walls or ceiling-height partitions shall comply with Section C405.5. Where less than 60 percent of the luminaires in a space enclosed by walls or ceiling-height partitions are new, the installed lighting wattage shall be maintained or reduced.
Alterations that replace 60 percent or more of the exterior luminaires shall comply with Section C405.6. Where less than 60 percent of the exterior luminaires are new, the installed lighting wattage shall be maintained or reduced.
Where new wiring is being installed to serve added fixtures and/or fixtures are being relocated to a new circuit, controls shall comply with Sections C405.2.1, C405.2.2.3, C405.2.3, C405.2.4, and as applicable C408.3. In addition, office areas less than 300 ft2 enclosed by walls or ceiling-height partitions, and all meeting and conference rooms, and all school classrooms, shall be equipped with occupancy sensors that comply with Section C405.2.2 and C408.3. Where a new lighting panel (or a moved lighting panel) with all new raceway and conductor wiring from the panel to the fixtures is being installed, controls shall also comply with the other requirements in Sections C405.2.2 and C408.3.
Where new walls or ceiling-height partitions are added to an existing space and create a new enclosed space, but the lighting fixtures are not being changed, other than being relocated, the new enclosed space shall have controls that comply with Sections C405.2.1, C405.2.2, C405.2.3 and C408.3.
Those motors which are altered or replaced shall comply with Section C403.2.13.
C101.4.3.2 Mechanical systems. Those parts of systems which are altered or replaced shall comply with Section C403. Additions or alterations shall not be made to an existing mechanical system that will cause the existing mechanical system to become out of compliance.
All new systems in existing buildings, including packaged unitary equipment and packaged split systems, shall comply with Section C403.
Where mechanical cooling is added to a space that was not previously cooled, the mechanical cooling system shall comply with the economizer requirements in Section C403.3.1 or C403.4.1.
EXCEPTION:
Alternate designs that are not in full compliance with this code may be approved when the building official determines that existing building or occupancy constraints make full compliance impractical or where full compliance would be economically impractical.
Alterations to existing mechanical cooling systems shall not decrease economizer capacity unless the system complies with Section C403.3.1 or C403.4.1. In addition, for existing mechanical cooling systems that do not comply with Sections C403.3.1 or Section 403.4.1, including both the individual unit size limits and the total building capacity limits on units without economizer, other alterations shall comply with Table C101.4.3.2.
When space cooling equipment is replaced, controls shall be installed to provide for integrated operation with economizer in accordance with Section C403.3.
Existing equipment currently in use may be relocated within the same floor or same tenant space if removed and reinstalled within the same permit.
C101.4.4 Change in occupancy or use. Spaces undergoing a change in occupancy from an F, S or U occupancy to an occupancy other than F, S or U shall comply with this code. Any space that is converted to a Group R dwelling unit or portion thereof, from another use or occupancy shall comply with this code. Where the use in a space changes from one use in Table C405.5.2 (1) or (2) to another use in Table C405.5.2 (1) or (2), the installed lighting wattage shall comply with Section C405.5.
EXCEPTION:
Where the component performance building envelope option in Section C402.1.3 is used to comply with this section, the Proposed UA is allowed to be up to 110 percent of the Target UA. Where the total building performance option in Section C407 is used to comply with this section, the annual energy consumption of the proposed design is allowed to be 110 percent of the annual energy consumption otherwise allowed by Section C407.3 and Section C401.2 (3).
C101.4.5 Change in space conditioning. Any nonconditioned space that is altered to become conditioned space or semi-heated space shall be required to be brought into full compliance with this code. Any semi-heated space that is altered to become conditioned space shall be required to be brought into full compliance with this code.
EXCEPTION:
Where the component performance building envelope option in Section C402.1.3 is used to comply with this section, the Proposed UA is allowed to be up to 110 percent of the Target UA. Where the total building performance option in Section C407 is used to comply with this section, the annual energy consumption of the proposed design is allowed to be 110 percent of the annual energy consumption otherwise allowed by Section C407.3 and Section C401.2 (3).
C101.4.6)) Mixed occupancy. Where a building includes both residential and commercial occupancies, each occupancy shall be separately considered and meet the applicable provisions of ((IECC)) WSECCommercial Provisions or ((IECC)) WSECResidential Provisions.
AMENDATORY SECTION (Amending WSR 13-20-120, filed 10/1/13, effective 11/1/13)
WAC 51-11C-10143 ((Table C101.4.3.2Economizer compliance options for mechanical alterations.)) Reserved.
((Table C101.4.3.2
Economizer Compliance Options for Mechanical Alterations
 
Option A
Option B
(alternate to A)
Option C
(alternate to A)
Option D
(alternate to A)
Unit Type
Any alteration with new or replacement equipment
Replacement unit of the same type with the same or smaller output capacity
Replacement unit of the same type with a larger output capacity
New equipment added to existing system or replacement unit of a different type
1. Packaged Units
Efficiency: min.1
Economizer: C403.4.12
Efficiency: min.1
Economizer:
C403.4.12, 3
Efficiency: min.1
Economizer: C403.4.12, 3
Efficiency: min.1
Economizer: C403.4.12, 4
2. Split Systems
Efficiency: min.1
Economizer: C403.4.12
Efficiency:  + 10/5%5
Economizer: Shall not decrease existing economizer capability
Only for new units
< 54,000 Btu/h replacing unit installed prior to 1991 (one of two):
Efficiency: + 10/5%5 Economizer: 50%6
Efficiency: min.1
Economizer: C403.4.12, 4
 
 
 
For units ˃ 54,000 Btu/h or any units installed after 1991:
Option A
 
3. Water Source Heat Pump
Efficiency: min.1
Economizer: C403.4.12
(two of three):
Efficiency:  + 10/5%5
Flow control valve7
Economizer: 50%6
(three of three):
Efficiency:  + 10/5%5
Flow control valve7
Economizer: 50%6 (except for certain pre-1991 systems8)
Efficiency: min.1
Economizer:
C403.4.12, 4 (except for certain pre-1991 systems8)
4. Hydronic Economizer using Air-Cooled Heat Rejection Equipment (Dry Cooler)
Efficiency: min.1
Economizer: 14332
Efficiency: + 10/5%5
Economizer: Shall not decrease existing economizer capacity
Option A
Efficiency: min.1
Economizer: C403.4.12, 4
5. Air-Handling Unit (including fan coil units) where the system has an air-cooled chiller
Efficiency: min.1
Economizer: C403.4.12
 
Economizer: Shall not decrease existing economizer capacity
Option A (except for certain pre-1991 systems8)
Option A (except for certain pre-1991 systems8)
 
6. Air- Handling Unit (including fan coil units) and Water-cooled Process Equipment, where the system has a water-cooled chiller10
Efficiency: min.1
Economizer: C403.4.12
Economizer: Shall not decrease existing economizer capacity
Option A
(except for certain pre-1991 systems8 and certain 1991-2004 systems9)
Efficiency: min.1
Economizer:
C403.4.12, 4 (except for certain pre-1991 systems8 and certain 1991-2004 systems9)
7. Cooling Tower
Efficiency: min.1
Economizer: C403.4.12
No requirements
Option A
Option A
8. Air-Cooled Chiller
Efficiency: min.1
Economizer: C403.4.12
Efficiency:  + 5%11
Economizer: Shall not decrease existing economizer capacity
Efficiency (two of two): (1) + 10%12 and (2) multistage Economizer: Shall not decrease existing economizer capacity
Efficiency: min.1
Economizer: C403.4.12, 4
9. Water-
Cooled Chiller
Efficiency: min.1
Economizer: C403.4.12
Efficiency (one of two): (1) + 10%13 or (2) plate frame heat exchanger15
Economizer: Shall not decrease existing economizer capacity
Efficiency (two of two): (1) + 15%14 and (2) plate frame heat exchanger15
Economizer: Shall not decrease existing economizer capacity
Efficiency: min.1
Economizer: C403.4.12, 4
10. Boiler
Efficiency: min.1
Economizer: C403.4.12
Efficiency:  + 8%16
Economizer: Shall not decrease existing economizer capacity
Efficiency: + 8%16
Economizer: Shall not decrease existing economizer capacity
Efficiency: min.1
Economizer: C403.4.12, 4
1
Minimum equipment efficiency shall comply with Section C403.2.3 and Tables C403.2.3(1) through C403.2.3(9).
2
System and building shall comply with Section C403.4.1 (including both the individual unit size limits and the total building capacity limits on units without economizer). It is acceptable to comply using one of the exceptions to Section C403.4.1.
3
All equipment replaced in an existing building shall have air economizer complying with Sections C403.3.1 and C403.4.1 unless both the individual unit size and the total capacity of units without air economizer in the building is less than that allowed in Exception 1 to Section C403.3.1.
4
All separate new equipment added to an existing building shall have air economizer complying with Sections C403.3.1 and C403.4.1 unless both the individual unit size and the total capacity of units without air economizer in the building is less than that allowed in Exception 1 to Section C403.4.1.
5
Equipment shall have a capacity-weighted average cooling system efficiency:
a.
For units with a cooling capacity below 54,000 Btu/h, a minimum of 10% greater than the requirements in Tables C403.2.3(1) and C403.2.3(2) (1.10 x values in Tables C403.2.3(1) and C403.2.3(2)).
b.
For units with a cooling capacity of 54,000 Btu/h and greater, a minimum of 5% greater than the requirements in Tables C403.2.3(1) and C403.2.3(2) (1.05 x values in Tables C403.2.3(1) and C403.2.3(2)).
6
Minimum of 50% air economizer that is ducted in a fully enclosed path directly to every heat pump unit in each zone, except that ducts may terminate within 12 inches of the intake to an HVAC unit provided that they are physically fastened so that the outside air duct is directed into the unit intake. If this is an increase in the amount of outside air supplied to this unit, the outside air supply system shall be capable of providing this additional outside air and equipped with economizer control.
7
Have flow control valve to eliminate flow through the heat pumps that are not in operation with variable speed pumping control complying with Section C403.4.3 for that heat pump.
 
 
– When the total capacity of all units with flow control valves exceeds 15% of the total system capacity, a variable frequency drive shall be installed on the main loop pump.
 
 
– As an alternate to this requirement, have a capacity-weighted average cooling system efficiency that is 5% greater than the requirements in note 5 (i.e., a minimum of 15%/10% greater than the requirements in Tables C403.2.3(1) and C403.2.3(2) (1.15/1.10 x values in Tables C403.2.3(1) and C403.2.3(2)).
8
Systems installed prior to 1991 without fully utilized capacity are allowed to comply with Option B, provided that the individual unit cooling capacity does not exceed 90,000 Btu/h.
9
Economizer not required for systems installed with water economizer plate and frame heat exchanger complying with previous codes between 1991 and June 2013, provided that the total fan coil load does not exceed the existing or added capacity of the heat exchangers.
10
For water-cooled process equipment where the manufacturers' specifications require colder temperatures than available with waterside economizer, that portion of the load is exempt from the economizer requirements.
11
The air-cooled chiller shall have an IPLV efficiency that is a minimum of 5% greater than the IPLV requirements in Table C403.2.3(7) (1.05 x IPLV values in Table C403.2.3(7)).
12
The air-cooled chiller shall:
a.
Have an IPLV efficiency that is a minimum of 10% greater than the IPLV requirements in Table C403.2.3(7) (1.10 x IPLV values in Table C403.2.3(7)); and
b.
Be multistage with a minimum of two compressors.
13
The water-cooled chiller shall have an IPLV efficiency that is a minimum of 10% greater than the IPLV requirements in Table C403.2.3(7) (1.10 x IPLV values in Table C403.2.3(7)).
14
The water-cooled chiller shall have an IPLV efficiency that is a minimum of 15% greater than the IPLV requirements in Table C403.2.3(7), (1.15 x IPLV values in Table C403.2.3(7)).
15
Economizer cooling shall be provided by adding a plate-frame heat exchanger on the waterside with a capacity that is a minimum of 20% of the chiller capacity at standard AHRI rating conditions.
16
The replacement boiler shall have an efficiency that is a minimum of 8% higher than the value in Table C403.2.3(5) (1.08 x value in Table C403.2.3(5)), except for electric boilers.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-10150 Section C101.5Compliance.
C101.5 Compliance. Residential buildings shall meet the provisions of ((IECC)) WSECResidential Provisions. Commercial buildings shall meet the provisions of ((IECC)) WSECCommercial Provisions.
C101.5.1 Compliance materials. The code official shall be permitted to approve specific computer software, worksheets, compliance manuals and other similar materials that meet the intent of this code.
((C101.5.2 Low energy buildings. The following buildings, or portions thereof, separated from the remainder of the building by building thermal envelope assemblies complying with this code shall be exempt from all thermal envelope provisions of this code:
1. Those that are heated and/or cooled with a peak design rate of energy usage less than 3.4 Btu/h • ft2 (10.7 W/m2) or 1.0 watt/ft2 (10.7 W/m2) of floor area for space conditioning purposes.
2. Those that do not contain conditioned space.
3. Greenhouses isolated from any conditioned space and not intended for occupancy.
C101.5.2.1 Semi-heated spaces. A semi-heated space shall meet all of the building thermal envelope requirements, except that insulation is not required for opaque wall assemblies. Component performance calculations involving semi-heated spaces shall calculate fully insulated opaque walls for the Target UA calculation, and Total Building Performance calculations involving semi-heated spaces shall calculate fully insulated opaque walls for the Standard Reference Design.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-10300 Section C103Construction documents.
C103.1 General. Construction documents and other supporting data shall be submitted in one or more sets with each application for a permit. The construction documents shall be prepared by a registered design professional where required by the statutes of the jurisdiction in which the project is to be constructed. Where special conditions exist, the code official is authorized to require necessary construction documents to be prepared by a registered design professional.
EXCEPTION:
The code official is authorized to waive the requirements for construction documents or other supporting data if the code official determines they are not necessary to confirm compliance with this code.
C103.2 Information on construction documents. Construction documents shall be drawn to scale upon suitable material. Electronic media documents are permitted to be submitted when approved by the code official. Construction documents shall be of sufficient clarity to indicate the location, nature and extent of the work proposed, and show in sufficient detail pertinent data and features of the building, systems and equipment as herein governed. Details shall include, but are not limited to, as applicable((,)):
1. Insulation materials and their R-values((;)).
2. Fenestration U-factors and SHGCs((;)).
3. Area-weighted U-factor and SHGC calculations((;)).
4. Mechanical system design criteria((;)).
5. Mechanical and service water heating system and equipment types, sizes and efficiencies((;)).
6. Economizer description((;)).
7. Equipment and systems controls((;)).
8. Fan motor horsepower (hp) and controls((;)).
9. Duct sealing, duct and pipe insulation and location((;)).
10. Lighting fixture schedule with wattage and control narrative((; and air sealing details)).
11. Location of daylight zones on floor plan.
12. Air barrier details including all air barrier boundaries and associated square foot calculations on all six sides of the air barrier as applicable.
C103.2.1 Building thermal envelope depiction. The building's thermal envelope shall be represented on the construction documents.
C103.3 Examination of documents. The code official shall examine or cause to be examined the accompanying construction documents and shall ascertain whether the construction indicated and described is in accordance with the requirements of this code and other pertinent laws or ordinances.
C103.3.1 Approval of construction documents. When the code official issues a permit where construction documents are required, the construction documents shall be endorsed in writing and stamped "Reviewed for Code Compliance." Such approved construction documents shall not be changed, modified or altered without authorization from the code official. Work shall be done in accordance with the approved construction documents.
One set of construction documents so reviewed shall be retained by the code official. The other set shall be returned to the applicant, kept at the site of work and shall be open to inspection by the code official or a duly authorized representative.
C103.3.2 Previous approvals. This code shall not require changes in the construction documents, construction or designated occupancy of a structure for which a lawful permit has been heretofore issued or otherwise lawfully authorized, and the construction of which has been pursued in good faith within 180 days after the effective date of this code and has not been abandoned.
C103.3.3 Phased approval. The code official shall have the authority to issue a permit for the construction of part of an energy conservation system before the construction documents for the entire system have been submitted or approved, provided adequate information and detailed statements have been filed complying with all pertinent requirements of this code. The holders of such permit shall proceed at their own risk without assurance that the permit for the entire energy conservation system will be granted.
C103.4 Amended construction documents. Changes made during construction that are not in compliance with the approved construction documents shall be resubmitted for approval as an amended set of construction documents.
C103.5 Retention of construction documents. One set of approved construction documents shall be retained by the code official for a period of not less than 180 days from date of completion of the permitted work, or as required by state or local laws.
C103.6 Building documentation and close out submittal requirements. The construction documents shall specify that the documents described in this section be provided to the building owner or owner's authorized agent within 180 days of the date of receipt of the certificate of occupancy.
C103.6.1 Record documents. Construction documents shall be updated to convey a record of the completed work. Such updates shall include mechanical, electrical and control drawings red-lined, or redrawn if specified, that show all changes to size, type and locations of components, equipment and assemblies.
C103.6.2 Manuals. An operating and maintenance manual shall be provided for each component, device, piece of equipment, and system required to be commissioned by this code. The manual shall include all of the following:
1. Submittal data indicating all selected options for each piece of equipment.
2. Manufacturer's operation manuals and maintenance manuals for each device, piece of equipment, and system requiring maintenance, except equipment not furnished as part of the project. Required routine maintenance actions, cleaning and recommended relamping shall be clearly identified.
3. Name and address of at least one service agency.
4. Controls system inspection schedule, maintenance and calibration information, wiring diagrams, schematics, and control sequence descriptions. Desired or field-determined setpoints shall be permanently recorded on control drawings at control devices or, for digital control systems, on the graphic where settings may be changed.
C103.6.3 Compliance documentation. All energy code compliance forms and calculations shall be delivered in one document to the building owner as part of the project record documents, manuals, or as a standalone document. This document shall include the specific energy code year utilized for compliance determination for each system. NFRC certificates for the installed windows, list total area for each NFRC certificate, the interior lighting power compliance path (building area, space-by-space) used to calculate the lighting power allowance.
For projects complying with C401.2, item one the documentation shall include:
1. The envelop insulation compliance path (prescriptive or component performance).
2. All completed code compliance forms, and all compliance calculations including, but not limited to, those required by sections C402.1.5, C403.2.12.1, C405.4, and C405.5.
For projects complying with C407 the documentation shall include:
1. A list of all proposed envelop component types, areas and U-values.
2. A list of all lighting area types with areas, lighting power allowance, and installed lighting power density.
3. A list of each HVAC system modeled with the assigned and proposed system type.
4. Electronic copies of the baseline and proposed model input and output file. The input files shall be in a format suitable for rerunning the model and shall not consist solely of formatted reports of the inputs.
C103.6.4 Systems operation training. Training of the maintenance staff for equipment included in the manuals required by Section C103.6.2 shall include at a minimum:
1. Review of manuals and permanent certificate.
2. Hands-on demonstration of all normal maintenance procedures, normal operating modes, and all emergency shutdown and start-up procedures.
3. Training completion report.
AMENDATORY SECTION (Amending WSR 14-24-122, filed 12/3/14, effective 1/3/15)
WAC 51-11C-10400 Section C104Inspections.
C104.1 General. Construction or work for which a permit is required shall be subject to inspection by the code official or his designated agent, and such construction or work shall remain accessible and exposed for inspection purposes until approved. It shall be the duty of the permit applicant to cause the work to remain accessible and exposed for inspection purposes. Neither the code official nor the jurisdiction shall be liable for expense entailed in the removal or replacement of any material, product, system or building component required to allow inspection to validate compliance with this code.
C104.2 Required ((approvals. Work shall not be done beyond the point indicated in each successive inspection without first obtaining the approval of the code official. The code official, upon notification, shall make the requested inspections and shall either indicate the portion of the construction that is satisfactory as completed, or notify the permit holder or his or her agent wherein the same fails to comply with this code. Any portions that do not comply shall be corrected and such portion shall not be covered or concealed until authorized by the code official. Where applicable, inspections shall include at least the requirements in Sections C104.2.1 through C104.2.3.2.
C104.2.1 Envelope
C104.2.1.1 Wall Insulation Inspection: To be made after all wall insulation and air vapor retarder sheet or film materials are in place, but before any wall covering is placed.
C104.2.1.2 Glazing Inspection: To be made after glazing materials are installed in the building.
C104.2.1.3 Exterior Roofing Insulation: To be made after the installation of the roof insulation, but before concealment.
C104.2.1.4 Slab/Floor Insulation: To be made after the installation of the slab/floor insulation, but before concealment.
C104.2.2 Mechanical
C104.2.2.1 Mechanical Equipment Efficiency and Economizer: To be made after all equipment and controls required by this code are installed and prior to the concealment of such equipment or controls.
C104.2.2.2 Mechanical Pipe and Duct Insulation: To be made after all pipe and duct insulation is in place, but before concealment.
C104.2.3 Lighting and motors
C104.2.3.1 Lighting Equipment and Controls: To be made after the installation of all lighting equipment and controls required by this code, but before concealment of the lighting equipment.
C104.2.3.2 Motor Inspections: To be made after installation of all equipment covered by this code, but before concealment.
C104.3)) inspections. The code official or his designated agent, upon notification, shall make the inspections set forth in Sections C104.2.1 through C104.2.6.
C104.2.1 Footing and foundation inspection. Inspections associated with footings and foundations shall verify compliance with the code as to R-value, location, thickness, depth of burial and protection of insulation as required by the code and approved plans and specifications.
C104.2.2 Insulation and fenestration inspection. Inspections shall be made before application of interior finish and shall verify compliance with the code as to types of insulation and corresponding R-values and their correct location and proper installation; fenestration properties (U-factor, SHGC and VT) and proper installation; and air leakage controls as required by the code and approved plans and specifications.
C104.2.3 Plumbing inspection. Inspections verify compliance as required by the code and approved plans and specifications as to types of insulation and corresponding R-values and protection, required controls and required heat traps.
C104.2.4 Mechanical inspection. Inspections shall verify compliance as required by the code and approved plans and specifications as to installed HVAC equipment type and size, required controls, system insulation and corresponding R-value, system and damper air leakage and required energy recovery and/or economizers.
C104.2.5 Electrical and lighting inspection. Inspections shall verify compliance as required by the code and approved plans and specifications as to installed lighting systems, components and controls; motors and installation of an electric meter for each dwelling unit.
C104.2.6 Final inspection. The building shall have a final inspection and not be occupied until approved.
((C104.4)) C104.3 Reinspection. A building shall be reinspected when determined necessary by the code official.
((C104.5)) C104.4 Approved inspection agencies. The code official is authorized to accept reports of approved inspection agencies, provided such agencies satisfy the requirements as to qualifications and reliability relevant to the building components and systems they are inspecting.
((C104.6)) C104.5 Inspection requests. It shall be the duty of the holder of the permit or their duly authorized agent to notify the code official when work is ready for inspection. It shall be the duty of the permit holder to provide access to and means for inspections of such work that are required by this code.
((C104.7)) C104.6 Reinspection and testing. Where any work or installation does not pass an initial test or inspection, the necessary corrections shall be made so as to achieve compliance with this code. The work or installation shall then be resubmitted to the code official for inspection and testing.
((C104.8)) C104.7 Approval. After the prescribed tests and inspections indicate that the work complies in all respects with this code, a notice of approval shall be issued by the code official.
((C104.8.1)) C104.7.1 Revocation. The code official is authorized to, in writing, suspend or revoke a notice of approval issued under the provisions of this code wherever the certificate is issued in error, or on the basis of incorrect information supplied, or where it is determined that the building or structure, premise, or portion thereof is in violation of any ordinance or regulation or any of the provisions of this code.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-10600 Section C106Referenced standards.
C106.1 Referenced codes and standards. The codes and standards referenced in this code shall be those listed in Chapter 5, and such codes and standards shall be considered as part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections C106.1.1 and C106.1.2.
C106.1.1 Conflicts. Where differences occur between provisions of this code and referenced codes and standards, the provisions of this code shall apply.
C106.1.2 Provisions in referenced codes and standards. Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code, as applicable, shall take precedence over the provisions in the referenced code or standard.
C106.2 ((Conflicting requirements. Where the provisions of this code and the referenced standards conflict, the provisions of this code shall take precedence.
C106.3)) Application of references. References to chapter or section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section or provision of this code.
((C106.4)) C106.3 Other laws. The provisions of this code shall not be deemed to nullify any provisions of local, state or federal law. In addition to the requirements of this code, all occupancies shall conform to the provisions included in the State Building Code (chapter 19.27 RCW). In case of conflicts among the codes enumerated in RCW 19.27.031 (1) through (4) and this code, an earlier named code shall govern over those following. In the case of conflict between the duct sealing and insulation requirements of this code and the duct insulation requirements of Sections 603 and 604 of the International Mechanical Code, the duct insulation requirements of this code, or where applicable, a local jurisdiction's energy code shall govern.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-10800 Section C108Stop work order.
C108.1 Authority. Whenever the code official finds any work regulated by this code being performed in a manner either contrary to the provisions of this code or dangerous or unsafe, the code official is authorized to issue a stop work order.
C108.2 Issuance. The stop work order shall be in writing and shall be given to the owner of the property involved, or to the owner's agent, or to the person doing the work. Upon issuance of a stop work order, the cited work shall immediately cease. The stop work order shall state the reason for the order, and the conditions under which the cited work will be permitted to resume.
C108.3 Emergencies. Where an emergency exists, the code official shall not be required to give a written notice prior to stopping the work.
C108.4 Failure to comply. Any person who shall continue any work after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be liable to a fine ((of not less than [AMOUNT] dollars or more than [AMOUNT] dollars)) as set by the applicable governing authority.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20201 Section C202.1A.
ABOVE-GRADE WALL. A wall enclosing conditioned space that is not a below-grade wall. This includes between-floor spandrels, peripheral edges of floors, roof and basement knee walls, dormer walls, gable end walls, walls enclosing a mansard roof and skylight shafts.
ACCESSIBLE. Admitting close approach as a result of not being guarded by locked doors, elevation or other effective means (see "Readily accessible").
ADDITION. An extension or increase in the conditioned space floor area or height of a building or structure.
AIR BARRIER. Material(s) assembled and joined together to provide a barrier to air leakage through the building envelope. An air barrier may be a single material or a combination of materials.
AIR CURTAIN. A device, installed at the building entrance, that generates and discharges a laminar air stream intended to prevent the infiltration of external, unconditioned air into the conditioned spaces, or the loss of interior, conditioned air to the outside.
ALTERATION. Any construction, retrofit or renovation to an existing structure other than repair or addition that requires a permit. Also, a change in a building, electrical, gas, mechanical or plumbing system that involves an extension, addition or change to the arrangement, type or purpose of the original installation that requires a permit.
APPROVED. Approval by the code official as a result of investigation and tests conducted by him or her, or by reason of accepted principles or tests by nationally recognized organizations.
APPROVED AGENCY. An established and recognized agency regularly engaged in conducting tests or furnishing inspection services, when such agency has been approved by the code official.
ATTIC AND OTHER ROOFS. All other roofs, including roofs with insulation entirely below (inside of) the roof structure (i.e., attics, cathedral ceilings, and single-rafter ceilings), roofs with insulation both above and below the roof structure, and roofs without insulation but excluding roofs with insulation entirely above deck and metal building roofs.
AUTOMATIC. Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current strength, pressure, temperature or mechanical configuration (see "Manual").
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20202 Section C202.2B.
BELOW-GRADE WALL. That portion of a wall in the building envelope that is entirely below the finish grade and in contact with the ground.
BOILER, MODULATING. A boiler that is capable of more than a single firing rate in response to a varying temperature or heating load.
BOILER SYSTEM. One or more boilers, their piping and controls that work together to supply steam or hot water to heat output devices remote from the boiler.
BUBBLE POINT. The refrigerant liquid saturation temperature at a specified pressure.
BUILDING. Any structure used or intended for supporting or sheltering any use or occupancy, including any mechanical systems, service water heating systems and electric power and lighting systems located on the building site and supporting the building.
BUILDING COMMISSIONING. A process that verifies and documents that the selected building systems have been designed, installed, and function according to the owner's project requirements and construction documents, and to minimum code requirements.
BUILDING ENTRANCE. Any door, set of doors, doorway, or other form of portal that is used to gain access to the building from the outside by the public.
BUILDING SITE. A contiguous area of land that is under the ownership or control of one entity.
BUILDING THERMAL ENVELOPE. The below-grade walls, above-grade walls, floor, roof, and any other building elements that enclose conditioned space or provides a boundary between conditioned space, semiheated space and exempt or unconditioned space.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20203 Section C202.3C.
-FACTOR (THERMAL CONDUCTANCE).C The coefficient of heat transmission (surface to surface) through a building component or assembly, equal to the time rate of heat flow per unit area and the unit temperature difference between the warm side and cold side surfaces (Btu/h ft2 x °F) [W/(m2 x K)].
CERTIFIED COMMISSIONING PROFESSIONAL. An individual who is certified by an ANSI/ISO/IEC 17024:2012 accredited organization to lead, plan, coordinate and manage commissioning teams and implement commissioning processes. The individual's accredited certification required by the referenced standard provides a measured level of experience and competence with the various whole building commissioning processes and ability to deliver quality service. Accredited organizations include, but are not limited to, AABC, BCA, and NEBB. The engineer of record for the project may be considered the certified commissioning professional if she/he is qualified to perform commissioning services for the entire commissioning process.
CIRCULATING HOT WATER SYSTEM. A specifically designed water distribution system where one or more pumps are operated in the service hot water piping to circulate heated water from the water-heating equipment to the fixture supply and back to the water-heating equipment.
CLERESTORY FENESTRATION. See "FENESTRATION."
CLIMATE ZONE. A geographical region based on climatic criteria as specified in this code.
CODE OFFICIAL. The officer or other designated authority charged with the administration and enforcement of this code, or a duly authorized representative.
COEFFICIENT OF PERFORMANCE (COP) - COOLING. The ratio of the rate of heat removal to the rate of energy input, in consistent units, for a complete refrigerating system or some specific portion of that system under designated operating conditions.
COEFFICIENT OF PERFORMANCE (COP) - HEATING. The ratio of the rate of heat removal to the rate of heat delivered to the rate of energy input, in consistent units, for a complete heat pump system, including the compressor and, if applicable, auxiliary heat, under designated operating conditions.
COMMERCIAL BUILDING. For this code, all buildings that are not included in the definition of "Residential buildings."
COMPUTER ROOM. A room whose primary function is to house equipment for the processing and storage of electronic data and that has a design electronic data equipment power density exceeding 20 watts per square foot of conditioned area.
CONDENSING UNIT. A factory-made assembly of refrigeration components designed to compress and liquefy a specific refrigerant. The unit consists of one or more refrigerant compressors, refrigerant condensers (air-cooled, evaporatively cooled, or water-cooled), condenser fans and motors (where used) and factory-supplied accessories.
CONDITIONED FLOOR AREA. The horizontal projection of the floors associated with the conditioned space.
CONDITIONED SPACE. An area ((or room within a building being heated or cooled, containing uninsulated ducts, or with a fixed opening directly into an adjacent conditioned space)), room or space that is enclosed within the building thermal envelope and that is directly heated or cooled or that is indirectly heated or cooled. Spaces are indirectly heated or cooled where they communicate through openings with conditioned spaces, where they are separated from conditioned spaces by uninsulated walls, floors or ceilings, or where they contain uninsulated ducts, piping or other sources of heating or cooling.
CONTINUOUS AIR BARRIER. A combination of materials and assemblies that restrict or prevent the passage of air through the building thermal envelope.
CONTINUOUS INSULATION (CI). ((Insulation)) Insulating material that is continuous across all structural members without thermal bridges other than ((service openings and penetrations by metal fasteners with a cross-sectional area, as measured in the plane of the surface, of less than 0.04% of the opaque surface area of the assembly)) fasteners and service openings. It is installed on the interior or exterior or is integral to any opaque surface of the building envelope.
CONTROLLED PLANT GROWTH ENVIRONMENT. Group F and U buildings or spaces that are specifically controlled to facilitate and enhance plant growth and production by manipulating various indoor environment conditions. Technologies include indoor agriculture, cannabis growing, hydroponics, aquaculture and aquaponics. Controlled indoor environment variables include, but are not limited to, temperature, air quality, humidity, and carbon dioxide.
CURTAIN WALL. Fenestration products used to create an external nonload-bearing wall that is designed to separate the exterior and interior environments.
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20204 Section C202.4D.
DATA ACQUISITION SYSTEM. An electronic system managed by the building owner to collect, tabulate and display metering information.
DAYLIGHT RESPONSIVE CONTROL. A device or system that provides automatic control of electric light levels based on the amount of daylight in a space.
DAYLIGHT ZONE. (((See also Fig. C202.4)
1. Under skylights. The area under skylights whose horizontal dimension, in each direction, is equal to the skylight dimension in that direction plus either 70 percent of the floor-to-ceiling height or the dimension to a ceiling height opaque partition, or one-half the distance to adjacent skylights or vertical fenestration, whichever is least.
2. Adjacent to vertical fenestration. The area adjacent to vertical fenestration which receives daylight through the fenestration. For purposes of this definition and unless more detailed analysis is provided, the primary daylight zone depth is assumed to extend into the space a distance equal to the window head height and the secondary daylighted zone extends from the edge of the primary zone to a distance equal to two times the window head height or to the nearest ceiling height opaque partition, whichever is less. The daylight zone width is assumed to be the width of the window plus 2 feet (610 mm) on each side, or the window width plus the distance to an opaque partition, or the window width plus one-half the distance to adjacent skylight or vertical fenestration, whichever is least.
3. In parking garages. The area within 20 feet of any portion of a perimeter wall that has a net opening to wall ratio of at least 40 percent and no exterior obstructions within 20 feet.
4. Under atrium glazing. The area at the floor directly beneath the atrium and the top floor under the atrium whose horizontal dimension, in each direction, is equal to the distance between the floor and ceiling height. Levels below the top floor that are not directly beneath the atrium are unaffected.
Figure C202.1
 
 
)) 
The portion of the building interior floor area that is illuminated by natural daylight through sidelight and toplight fenestration.
DEMAND CONTROL VENTILATION (DCV). A ventilation system capability that provides for the automatic reduction of outdoor air intake below design rates when the actual occupancy of spaces served by the system is less than design occupancy.
DEMAND RECIRCULATION WATER SYSTEM. A water distribution system where ((pump(s))) pumps prime the service hot water piping with heated water upon demand for hot water.
DUCT. A tube or conduit utilized for conveying air. The air passages of self-contained systems are not to be construed as air ducts.
DUCT SYSTEM. A continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment and appliances.
DWELLING UNIT. A single unit providing complete independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation.
DYNAMIC GLAZING. Any fenestration product that has the fully reversible ability to change its performance properties, including U-factor, SHGC, or VT.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20206 Section C202.6F.
FAN BRAKE HORSEPOWER (BHP). The horsepower delivered to the fan's shaft. Brake horsepower does not include the mechanical drive losses (belts, gears, etc.).
FAN EFFICIENCY GRADE (FEG). A numerical rating identifying the fan's aerodynamic ability to convert shaft power, or impeller power in the case of a direct-driven fan, to air power.
FAN SYSTEM BHP. The sum of the fan brake horsepower of all fans that are required to operate at fan system design conditions to supply air from the heating or cooling source to the conditioned space(s) and return it to the source or exhaust it to the outdoors.
FAN SYSTEM DESIGN CONDITIONS. Operating conditions that can be expected to occur during normal system operation that result in the highest supply fan airflow rate to conditioned spaces served by the system.
FAN SYSTEM MOTOR NAMEPLATE HP. The sum of the motor nameplate horsepower of all fans that are required to operate at design conditions to supply air from the heating or cooling source to the conditioned space(s) and return it to the source or exhaust it to the outdoors.
FENESTRATION. ((Skylights, roof windows, vertical windows (fixed or moveable), opaque doors, glazed doors, glazed block and combination opaque/glazed doors. Fenestration includes products with glass and nonglass glazing materials.)) Products classified as either vertical fenestration or skylights.
SKYLIGHT. Glass or other transparent or translucent glazing material installed at a slope of less than 60 degrees (91.05 rad) from horizontal.
VERTICAL FENESTRATION. Windows (fixed or moveable), glazed doors, glazed block and combination opaque/glazed doors composed of glass or other transparent or translucent glazing materials and installed at a slope of at least 60 degrees (91.05 rad) from horizontal. Opaque areas such as spandrel panels are not considered vertical fenestration.
CLERESTORY FENESTRATION. An upper region of vertical fenestration provided for the purpose of admitting daylight beyond the perimeter of a space. The entire clerestory fenestration assembly is installed at a height greater than 8 feet above the finished floor.
FENESTRATION AREA. Total area of the fenestration measured using the rough opening, and including the glazing, sash and frame.
FENESTRATION PRODUCT, FIELD-FABRICATED. A fenestration product whose frame is made at the construction site of standard dimensional lumber or other materials that were not previously cut, or otherwise formed with the specific intention of being used to fabricate a fenestration product or exterior door. Field fabricated does not include site-built fenestration.
FENESTRATION PRODUCT, SITE-BUILT. A fenestration designed to be made up of field-glazed or field-assembled units using specific factory cut or otherwise factory-formed framing and glazing units. Examples of site-built fenestration include storefront systems, curtain walls, and atrium roof systems.
-FACTOR.F The perimeter heat loss factor for slab-on-grade floors (Btu/h x ft x °F) [W/(m x K)].
FLOOR AREA, NET. The actual occupied area not including unoccupied accessory areas such as corridors, stairways, toilet rooms, mechanical rooms and closets.
FURNACE ELECTRICITY RATIO. The ratio of furnace electricity use to total furnace energy computed as ratio = (3.412 x EAE)/1000 x EF + 3.412 x EAE) where EAE (average annual auxiliary electrical consumption) and EF (average annual fuel energy consumption) are defined in Appendix N to Subpart B of Part 430 of Title 10 of the Code of Federal Regulations and EF is expressed in millions of Btus per year.
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20207 Section C202.7G.
GENERAL LIGHTING. Lighting that provides a substantially uniform level of illumination throughout an area. General lighting shall not include ((decorative lighting or)) lighting that provides a dissimilar level of illumination to serve a ((specialized)) specific application or decorative feature within such area.
GENERAL PURPOSE ELECTRIC MOTOR (SUBTYPE I). A motor that is designed in standard ratings with either of the following:
1. Standard operating characteristics and standard mechanical construction for use under usual service conditions, such as those specified in NEMA MG1, paragraph 14.02, "Usual Service Conditions," and without restriction to a particular application or type of application.
2. Standard operating characteristics or standard mechanical construction for use under unusual service conditions, such as those specified in NEMA MG1, paragraph 14.03, "Unusual Service Conditions," or for a particular type of application, and that can be used in most general purpose applications.
General purpose electric motors (Subtype I) are constructed in NEMA T-frame sizes or IEC metric equivalent, starting at 143T.
GENERAL PURPOSE ELECTRIC MOTOR (SUBTYPE II). A motor incorporating the design elements of a general purpose electric motor (Subtype I) that is configured as one of the following:
1. A U-frame motor.
2. A Design C motor.
3. A close-coupled pump motor.
4. A footless motor.
5. A vertical, solid-shaft, normal-thrust motor (as tested in a horizontal configuration).
6. An 8-pole motor (900 rpm).
7. A polyphase motor with voltage of not more than 600 volts (other than 230 or 460 volts).
GREENHOUSE. A permanent structure or a thermally isolated area of a building that maintains a specialized sunlit environment that is used exclusively for, and is essential to, the cultivation, protection or maintenance of plants. Greenhouses are those that are erected for a period of 180 days or more.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20208 Section C202.8H.
HEAT TRAP. An arrangement of piping and fittings, such as elbows, or a commercially available heat trap that prevents thermosyphoning of hot water during standby periods.
HEATED SLAB-ON-GRADE FLOOR. Slab-on-grade floor construction in which the heating elements, hydronic tubing, or hot air distribution system is in contact with, or placed within or under, the slab.
((HIGH-EFFICACY LUMINAIRES. Luminaires with compact fluorescent lamps, T-8 or smaller diameter linear fluorescent lamps, or lamps with a minimum efficacy of:
1. 60 Lumens per watt for lamps over 40 watts;
2. 50 Lumens per watt for lamps over 15 watts to 40 watts; and
3. 40 Lumens per watt for lamps 15 watts or less.))
HIGH SPEED DOOR. A nonswinging door used primarily to facilitate vehicular access or material transportation, with a minimum opening rate of 32 inches (813 mm) per second, a minimum closing rate of 24 inches (610 mm) per second and that includes an automatic-closing device.
HISTORIC BUILDINGS. Buildings that are listed in or eligible for listing in the National Register of Historic Places, or designated as historic under an appropriate state or local law.
HUMIDISTAT. A regulatory device, actuated by changes in humidity, used for automatic control of relative humidity.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20209 Section C202.9I.
INFILTRATION. The uncontrolled inward air leakage into a building caused by the pressure effects of wind or the effect of differences in the indoor and outdoor air density or both.
((INSULATING SHEATHING. An insulating board with a core material having a minimum R-value of R-2.))
INSULATION ENTIRELY ABOVE DECK. A roof with all insulation:
1. Installed above (outside of) the roof structure; and
2. Continuous (i.e., uninterrupted by framing members).
INTEGRATED ENERGY EFFICIENCY RATIO (IEER). A single-number figure of merit expressing cooling part-load EER efficiency for unitary air-conditioning and heat pump equipment on the basis of weighted operation at various load capacities for the equipment.
INTEGRATED PART LOAD VALUE (IPLV). A single number figure of merit based on part-load EER, COP, or kW/ton expressing part-load efficiency for air conditioning and heat pump equipment on the basis of weighted operation at various load capacities for equipment.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20212 Section C202.12L.
LABELED. Equipment, materials or products to which have been affixed a label, seal, symbol or other identifying mark of a nationally recognized testing laboratory, inspection agency or other organization concerned with product evaluation that maintains periodic inspection of the production of the above-labeled items and whose labeling indicates either that the equipment, material or product meets identified standards or has been tested and found suitable for a specified purpose.
LINER SYSTEM (LS). A system that includes the following:
1. A continuous vapor barrier liner membrane that is installed below the purlins and that is uninterrupted by framing members.
2. An uncompressed, unfaced insulation resting on top of the liner membrane and located between the purlins.
For multilayer installations, the last rated R-value of insulation is for unfaced insulation draped over purlins and then compressed when the metal roof panels are attached.
LISTED. Equipment, materials, products or services included in a list published by an organization acceptable to the code official and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and whose listing states either that the equipment, material, product or service meets identified standards or has been tested and found suitable for a specified purpose.
LOW-SLOPED ROOF. A roof having a slope less than 2 units vertical in 12 units horizontal.
LOW-VOLTAGE DRY-TYPE DISTRIBUTION TRANSFORMER. A transformer that is air-cooled, does not use oil as a coolant, has an input voltage less than or equal to 600.
LOW-VOLTAGE LIGHTING. A lighting system consisting of an isolating power supply, the low voltage luminaires, and associated equipment that are all identified for the use. The output circuits of the power supply operate at 30 volts (42.4 volts peak) or less under all load conditions.
LUMINAIRE. A complete lighting unit consisting of a lamp or lamps together with the housing designed to distribute the light, position and protect the lamps, and connect the lamps to the power supply.
LUMINAIRE-LEVEL LIGHTING CONTROL. A lighting system consisting of one or more luminaire(s) with embedded lighting control logic, occupancy and ambient light sensors, wireless networking capabilities, and local override switching capability.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20213 Section C202.13M.
MANUAL. Capable of being operated by personal intervention (see "Automatic").
MASS TRANSFER DECK SLAB EDGE. That portion of the above-grade wall made up of the concrete slab where it extends past the footprint of the floor above. The area of the slab edge shall be defined as the thickness of the slab multiplied by the perimeter of the edge condition. Examples of this condition include, but are not limited to, the transition from an above-grade structure to a below-grade structure or the transition from a tower to a podium.
METAL BUILDING ROOF. A roof that:
1. Is constructed with a metal, structural, weathering surface;
2. Has no ventilated cavity; and
3. Has the insulation entirely below deck (i.e., does not include composite concrete and metal deck construction nor a roof framing system that is separated from the superstructure by a wood substrate) and whose structure consists of one or more of the following configurations:
a. Metal roofing in direct contact with the steel framing members;
b. Metal roofing separated from the steel framing members by insulation;
c. Insulated metal roofing panels installed as described in a or b.
METAL BUILDING WALL. A wall whose structure consists of metal spanning members supported by steel structural members (i.e., does not include spandrel glass or metal panels in curtain wall systems).
METER. A device that measures the flow of energy.
MICROCELL. A wireless communication facility consisting of an antenna that is either: (a) Four (4) feet in height and with an area of not more than 580 square inches; or (b) if a tubular antenna, no more than four (4) inches in diameter and no more than six (6) feet in length; and the associated equipment cabinet that is six (6) feet or less in height and no more than 48 square feet in floor area.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20215 Section C202.15O.
OCCUPANT SENSOR CONTROL. An automatic control device or system that detects the presence or absence of people within an area and causes lighting, equipment or appliances to be regulated accordingly.
ON-SITE RENEWABLE ENERGY. Energy derived from solar radiation, wind, waves, tides, landfill gas, biomass, or the internal heat of the earth. The energy system providing on-site renewable energy shall be located on the project site.
OPAQUE DOOR. A door that is not less than 50 percent opaque in surface area.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20216 Section C202.16P.
PERSONAL WIRELESS SERVICE FACILITY. A wireless communication facility (WCF), including a microcell, which is a facility for the transmission and/or reception of radio frequency signals and which may include antennas, equipment shelter or cabinet, transmission cables, a support structure to achieve the necessary elevation, and reception and/or transmission devices or antennas.
POWERED ROOF/WALL VENTILATORS. A fan consisting of a centrifugal or axial impeller with an integral driver in a weather-resistant housing and with a base designed to fit, usually by means of a curb, over a wall or roof opening.
PROPOSED DESIGN. A description of the proposed building used to estimate annual energy use for determining compliance based on total building performance.
AMENDATORY SECTION (Amending WSR 14-24-054, filed 11/25/14, effective 5/1/15)
WAC 51-11C-20218 Section C202.18R.
RADIANT HEATING SYSTEM. A heating system that transfers heat to objects and surfaces within a conditioned space, primarily by infrared radiation.
READILY ACCESSIBLE. Capable of being reached quickly for operation, renewal or inspection without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders or access equipment (see "Accessible").
REFRIGERANT DEW POINT. The refrigerant vapor saturation temperature at a specified pressure.
REFRIGERATED WAREHOUSE COOLER. An enclosed storage space that has a total chilled storage area of 3,000 ft2 or greater and is designed to maintain a temperature of greater than 32°F but less than 55°F.
REFRIGERATED WAREHOUSE FREEZER. An enclosed storage space that has a total chilled storage area of 3,000 ft2 or greater and is designed to maintain a temperature at or below 32°F.
REFRIGERATION SYSTEM, LOW TEMPERATURE. Systems for maintaining food product in a frozen state in refrigeration applications.
REFRIGERATION SYSTEM, MEDIUM TEMPERATURE. Systems for maintaining food product above freezing in refrigeration applications.
REGISTERED DESIGN PROFESSIONAL. An individual who is registered or licensed to practice their respective design profession as defined by the statutory requirements of the professional registration laws of the state or jurisdiction in which the project is to be constructed.
REPAIR. The reconstruction or renewal of any part of an existing building.
REROOFING. The process of recovering or replacing an existing roof covering. See "Roof Recover" and "Roof Replacement."
RESIDENTIAL BUILDING. For this code, includes detached one- and two-family dwellings and multiple single-family dwellings (townhouses) as well as Group R-2, R-3 and R-4 buildings three stories or less in height above grade plane.
ROOF ASSEMBLY. A system designed to provide weather protection and resistance to design loads. The system consists of a roof covering and roof deck or a single component serving as both the roof covering and the roof deck. A roof assembly includes the roof covering, underlayment, roof deck, insulation, vapor retarder and interior finish.
ROOF RECOVER. The process of installing an additional roof covering over a prepared existing roof covering without removing the existing roof covering.
ROOF REPAIR. Reconstruction or renewal of any part of an existing roof for the purposes of its maintenance.
ROOF REPLACEMENT. The process of removing the existing roof covering, repairing any damaged substrate and installing a new roof covering.
ROOFTOP MONITOR. A raised section of a roof containing vertical fenestration along one or more sides.
-VALUE (THERMAL RESISTANCE).R The inverse of the time rate of heat flow through a body from one of its bounding surfaces to the other surface for a unit temperature difference between the two surfaces, under steady state conditions, per unit area (h • ft2 • °F/Btu) [(m2 • K)/W].
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20219 Section C202.19S.
SATURATED-CONDENSING TEMPERATURE. The saturation temperature corresponding to the measured refrigerant pressure at the condenser inlet for single component and azeotropic refrigerants, and the arithmetic average of the dew point and bubble point temperatures corresponding to the refrigerant pressure at the condenser entrance for zeotropic refrigerants.
SCREW LAMP HOLDERS. A lamp base that requires a screw-in-type lamp, such as a compact-fluorescent, incandescent, or tungsten-halogen bulb.
SEMI-HEATED SPACE. An enclosed space within a building, including adjacent connected spaces separated by an uninsulated component (e.g., basements, utility rooms, garages, corridors), which:
1. Is heated but not cooled, and has a maximum installed heating system output capacity of 3.4 Btu/(h-ft2) but not greater than 8 Btu/(h-ft2);
2. Is not a ((cold storage space or frozen storage space)) walk-in or warehouse cooler or freezer space.
SERVICE WATER HEATING. Heating water for domestic or commercial purposes other than space heating and process requirements.
SKYLIGHT. ((Glass or other transparent or translucent glazing material installed at a slope of less than 60 degrees (1.05 rad) from horizontal. Glazing material in skylights, including unit skylights, solariums, sunrooms, roofs and sloped walls is included in this definition.)) See "Fenestration."
SLAB BELOW GRADE. Any portion of a slab floor in contact with the ground which is more than 24 inches below the final elevation of the nearest exterior grade.
SLAB-ON-GRADE FLOOR. That portion of a slab floor of the building envelope that is in contact with the ground and that is either above grade or is less than or equal to 24 inches below the final elevation of the nearest exterior grade.
SLEEPING UNIT. A room or space in which people sleep, which can also include permanent provisions for living, eating, and either sanitation or kitchen facilities but not both. Such rooms and spaces that are also part of a dwelling unit are not sleeping units.
SMALL ELECTRIC MOTOR. A general purpose, alternating current, single speed induction motor.
SMALL BUSINESS. Any business entity (including a sole proprietorship, corporation, partnership or other legal entity) which is owned and operated independently from all other businesses, which has the purpose of making a profit, and which has fifty or fewer employees.
SOLAR HEAT GAIN COEFFICIENT (SHGC). The ratio of the solar heat gain entering the space through the fenestration assembly to the incident solar radiation. Solar heat gain includes directly transmitted solar heat and absorbed solar radiation which is then reradiated, conducted or convected into the space.
STANDARD REFERENCE DESIGN. A version of the proposed design that meets the minimum requirements of this code and is used to determine the maximum annual energy use requirement for compliance based on total building performance.
STEEL-FRAMED WALL. A wall with a cavity (insulated or otherwise) whose exterior surfaces are separated by steel framing members (i.e., typical steel stud walls and curtain wall systems).
STOREFRONT. A nonresidential system of doors and windows mulled as a composite fenestration structure that has been designed to resist heavy use. Storefront systems include, but are not limited to, exterior fenestration systems that span from the floor level or above to the ceiling of the same story on commercial buildings, with or without mulled windows and doors.
SUBSYSTEM METER. A meter placed downstream of the energy supply meter that measures the energy delivered to a load or a group of loads.
((SUNROOM. A one-story structure attached to a dwelling with a glazing area in excess of 40 percent of the gross area of the structure's exterior walls and roof.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20220 Section C202.20T.
((THERMAL ISOLATION. Physical and space conditioning separation from conditioned space(s). The conditioned space(s) shall be controlled as separate zones for heating and cooling or conditioned by separate equipment.)) TEMPORARY GROWING STRUCTURE. A temporary growing structure has sides and roof covered with polyethylene, polyvinyl or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. Temporary structures are those that are erected for a period of less than 180 days.
THERMOSTAT. An automatic control device used to maintain temperature at a fixed or adjustable set point.
TIME SWITCH CONTROL. An automatic control device or system that controls lighting or other loads, including switching off, based on time schedules.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20221 Section C202.21U.
-FACTOR (THERMAL TRANSMITTANCE).U The coefficient of heat transmission (air to air) through a building component or assembly, equal to the time rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films (Btu/h • ft2 • °F) [W/(m2 • K)].
UNHEATED SLAB-ON-GRADE FLOOR. A slab-on-grade floor that is not a heated slab-on-grade floor.
UNIFORM ILLUMINATION. A quality of illumination delivered by a lighting system typically comprised of similar fixtures mounted at a regular spacing interval. This lighting system provides a uniform contrast ratio of no greater than 5:1 maximum-to-minimum ratio throughout the entire area served, including task areas.
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20222 Section C202.22V.
VARIABLE REFRIGERANT FLOW SYSTEM. An engineered direct-expansion (DX) refrigerant system that incorporates a common condensing unit, at least one variable capacity compressor, a distributed refrigerant piping network to multiple indoor fan heating and cooling units each capable of individual zone temperature control, through integral zone temperature control devices and a common communications network. Variable refrigerant flow utilizes three or more steps of control on common interconnecting piping.
VENTILATION. The natural or mechanical process of supplying conditioned or unconditioned air to, or removing such air from, any space.
VENTILATION AIR. That portion of supply air that comes from outside (outdoors) plus any recirculated air that has been treated to maintain the desired quality of air within a designated space.
VERTICAL FENESTRATION. ((All fenestration other than skylights.)) See "FENESTRATION."
VISIBLE TRANSMITTANCE [VT]. The ratio of visible light entering the space through the fenestration product assembly to the incident visible light, visible transmittance, includes the effects of glazing material and frame and is expressed as a number between 0 and 1.
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-20223 Section C202.23W.
WALK-IN COOLER. An enclosed storage space capable of being refrigerated to temperatures above 32°F ((that can be walked into and has a total chilled storage area of less than 3,000 ft2)) (0°C) and less than 55°F (12.8°C) that can be walked into, has a ceiling height of not less than 7 feet (2134 mm) and has a total chilled storage area of less than 3,000 square feet (279 m2).
WALK-IN FREEZER. An enclosed storage space capable of being refrigerated to temperatures at or below 32°F ((that can be walked into and has a total chilled storage area of less than 3,000 ft2)) (0°C) that can be walked into, has a ceiling height of not less than 7 feet (2134 mm) and has a total chilled storage area of less than 3,000 square feet (279 m2).
WALL. That portion of the building envelope, including opaque area and fenestration, that is vertical or tilted at an angle of 60 degrees from horizontal or greater. This includes above-grade walls and below-grade walls, between floor spandrels, peripheral edges of floors, and foundation walls.
WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system.
WOOD-FRAMED AND OTHER WALLS. All other wall types, including wood stud walls.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-30310 Section 303.1Identification.
C303.1 Identification. Materials, systems and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code.
C303.1.1 Building thermal envelope insulation. An R-value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches (305 mm) or greater in width. Alternately, the insulation installers shall provide a certification listing the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For sprayed polyurethane foam (SPF) insulation, the installed thickness of the areas covered and R-value of installed thickness shall be listed on the certification. For insulated siding, the R-value shall be labeled on the product's package and shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.
C303.1.1.1 Blown or sprayed roof/ceiling insulation. The thickness of blown-in or sprayed roof/ceiling insulation (fiberglass or cellulose) shall be written in inches (mm) on markers that are installed at least one for every 300 square feet (28 m2) throughout the attic space. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers ((a minimum)) of not less than 1 inch (25 mm) in height. Each marker shall face the attic access opening. Spray polyurethane foam thickness and installed R-value shall be listed on certification provided by the insulation installer.
C303.1.2 Insulation mark installation. Insulating materials shall be installed such that the manufacturer's R-value mark is readily observable upon inspection.
C303.1.3 Fenestration product rating. U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100 ((by an accredited, independent laboratory, and labeled and certified by the manufacturer)).
EXCEPTION:
Where required, garage door U-factors shall be determined in accordance with either NFRC 100 or ANSI/DASMA 105.
U-factors shall be determined by an accredited, independent laboratory, and labeled and certified by the manufacturer.
Products lacking such a labeled U-factor shall be assigned a default U-factor from Table C303.1.3(1), C303.1.3(2) or C303.1.3(4). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table C303.1.3(3).
EXCEPTION:
Units without NFRC ratings produced by a small business may be assigned default U-factors from Table C303.1.3(5) for vertical fenestration.
C303.1.4 Insulation product rating. The thermal resistance (R-value) of insulation shall be determined in accordance with the U.S. Federal Trade Commission R-value rule (C.F.R. Title 16, Part 460) in units of h x ft2 x °F/Btu at a mean temperature of 75°F (24°C).
C303.1.4.1 Insulated siding. The thermal resistance (R-Value) shall be determined in accordance with ASTM C1363. Installation for testing shall be in accordance with the manufacturer's installation instructions.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-303131 Table C303.1.3(1)Default glazed fenestration U-factors.
Table C303.1.3(1)
Default Glazed Fenestration U-Factors
FRAME TYPE
SINGLE PANE
DOUBLE PANE
SKY-LIGHT
Metal
1.20
0.80
 
Metal with Thermal Break
1.10
0.65
See Table
C303.1.3(4)
Nonmetal or Metal Clad
0.95
0.55
 
Glazed Block
0.60
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-30320 Section C303.2Installation.
C303.2 Installation. ((All)) Materials, systems and equipment shall be installed in accordance with the manufacturer's ((installation)) instructions and the International Building Code.
C303.2.1 Protection of exposed foundation insulation. Insulation applied to the exterior of basement walls, crawlspace walls and the perimeter of slab-on-grade floors shall have a rigid, opaque and weather-resistant protective covering to prevent the degradation of the insulation's thermal performance. The protective covering shall cover the exposed exterior insulation and extend ((a minimum of)) not less than 6 inches (153 mm) below grade.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40100 Section C401General.
C401.1 Scope. The ((requirements contained)) provisions in this chapter are applicable to commercial buildings((, or portions of commercial buildings)) and their building sites.
C401.2 Application. Commercial buildings shall comply with one of the following:
1. The requirements of Sections C402, C403, C404, C405, C406, C408 ((and)), C409 and C410.
2. The requirements of Section C407, C408, C409, C410, C402.4, C403.2, C404, C405.2, C405.3, C405.4, C405.6 and C405.7. The building energy consumption shall be equal to or less than 87, 90, or 93 percent of the standard reference design building, depending on the option selected per Section C407.3.
((C401.2.1 Application to existing buildings. Additions, alterations and repairs to existing buildings shall comply with Sections C402, C403, C404, C405, C408 and C409.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40210 Section C402.1General (Prescriptive).
C402.1 General (Prescriptive). ((The)) Building thermal envelope ((shall)) assemblies for buildings that are intended to comply with ((Section C402.1.1. Section C402.1.2 or Section C402.1.3 shall be permitted as an alternative to the R-values specified in Section C402.1.1. Walk-in coolers and walk-in freezers shall comply with C402.5. Refrigerated warehouse coolers and refrigerated warehouse freezers shall comply with C402.6.
EXCEPTION:
Unstaffed equipment shelters or cabinets used solely for personal wireless service facilities.))
the code on a prescriptive basis, in accordance with the compliance path described in Item 1 of Section C401.2, shall comply with the following:
1. The opaque portions of the building thermal envelope shall comply with the specific insulation requirements of Section C402.2 and the thermal requirements of either the R-value based method of Section C402.1.3, the U-, C- and F-factor based method of Section C402.1.4, or the component performance alternative of Section C402.1.5.
2. Fenestration in building envelope assemblies shall comply with Section C402.4.
3. Air leakage of building envelope assemblies shall comply with Section C402.5.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40211 Section C402.1.1((Insulation and fenestration criteria)) Low energy buildings.
C402.1.1 ((Insulation and fenestration criteria. The building thermal envelope shall meet the requirements of Tables C402.2 and C402.3 based on the climate zone specified in Chapter 3. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the R-values from the "Group R" column of Table C402.2. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the R-values from the "All other" column of Table C402.2.)) Low energy buildings. The following buildings, or portions thereof, separated from the remainder of the building by building thermal envelope assemblies complying with this code shall be exempt from all thermal envelope provision of this code:
1. Those that are heated and/or cooled with a peak design rate of energy usage less than 3.4 Btu/hx ft2 (10.7 W/m2) or 1.0 watt/ft2 (10.7 W/m2) of floor area for space conditioning purposes.
2. Those that do not contain conditioned space.
3. Greenhouses where cooling does not include a condensing unit and that are isolated from any other conditioned space.
4. Unstaffed equipment shelters or cabinets used solely for personal wireless service facilities.
C402.1.1.1 Semi-heated buildings and spaces. The building envelope of semi-heated buildings, or portions thereof, shall comply with the same requirements as that for conditioned spaces in Section C402. Building envelope assemblies separating conditioned space from semi-heated space shall comply with exterior envelope insulation requirements. Semi-heated spaces heated by mechanical systems that do not include electric resistance heating equipment are not required to comply with the opaque wall insulation provisions of Section C402.2.3 for walls that separate semi-heated spaces from the exterior or low energy spaces. Semi-heated spaces shall be calculated separately from other conditioned spaces for compliance purposes. Opaque walls in semi-heated spaces shall be calculated as fully code compliant opaque walls for both the target and proposed for the Target UA calculations for Component Performance compliance per Section C402.1.5, and for the Standard Reference Design for Total Building Performance compliance per Section C407.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40212 Section C402.1.2((U-factor alternative)) Equipment buildings.
C402.1.2 ((U-factor alternative. An assembly with a U-factor, C-factor, or F-factor equal or less than that specified in Table C402.1.2 shall be permitted as an alternative to the R-value in Table C402.2. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the U-factor, C-factor, or F-factor from the "Group R" column of Table C402.1.2. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the U-factor, C-factor or F-factor from the "All other" column of Table C402.1.2. The U-factors for typical construction assemblies are included in Appendix A. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Appendix A, values shall be calculated in accordance with the ASHRAE Handbook—Fundamentals using the framing factors listed in Appendix A where applicable and shall include the thermal bridging effects of framing materials.)) Equipment buildings. Buildings that comply with all of the following shall be exempt from the building thermal envelope provisions of this code:
1. Are separate buildings with floor area no more than 500 square feet (50 m2).
2. Are intended to house electronic equipment with installed equipment power totaling at least 7 watts per square foot (75 W/m2) and not intended for human occupancy.
3. Have a heating system capacity not greater than 17,000 Btu/hr (5 kW) and a heating thermostat set point that is restricted to not more than 50°F (10°C).
4. Have an average wall and roof U-factor less than 0.200.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-402121 Table ((C402.1.2)) C402.1.3Opaque thermal envelope assembly R-value requirements.
((Table C402.1.2
Opaque Thermal Envelope Assembly Requirementsa
CLIMATE ZONE
5 AND MARINE 4
6
 
All Other
Group R
All Other
Group R
Roofs
Insulation entirely above deck
U-0.034
U-0.031
U-0.032
U-0.031
Metal buildings
U-0.031
U-0.031
U-0.029
U-0.031
Attic and other
U-0.021
U-0.021
U-0.021
U-0.021
Walls, Above Grade
Mass
U-0.104d
U-0.078
U-0.078
U-0.071
Metal building
U-0.052
U-0.052
U-0.052
U-0.044
Steel framed
U-0.055
U-0.055
U-0.049
U-0.044
Wood framed and other
U-0.054
U-0.054
U-0.051
U-0.044
Walls, Below Grade
Below-grade wallb
Same as above grade
Same as above grade
Same as above grade
Same as above grade
Floors
Mass
U-0.031
U-0.031
U-0.031
U-0.031
Joist/framing
U-0.029
U-0.029
U-0.029
U-0.029
Slab-on-Grade Floors
Unheated slabs
F-0.54
F-0.54
F-0.54
F-0.52
Heated slabsc
F-0.55
F-0.55
F-0.55
F-0.55
a
Use of opaque assembly U-factors, C-factors, and F-factors from Appendix A is required unless otherwise allowed by Section C402.1.2.
b
Where heated slabs are below grade, below-grade walls shall comply with the F-factor requirements for heated slabs.
c
Heated slab F-factors shall be determined specifically for heated slabs. Unheated slab factors shall not be used.
d
Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following:
1
At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and
2
The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall U-factor from Table C402.1.2.))
Table C402.1.3
Opaque Thermal Envelope Insulation Component
Minimum Requirements, R-value Methoda,g
CLIMATE ZONE
5 AND MARINE 4
 
All Other
Group R
Roofs
Insulation entirely above deck
R-38ci
R-38ci
Metal buildingsb
R-25 + 
R-11 LS
R-25 + 
R-11 LS
Attic and other
R-49
R-49
Walls, Above Grade
Mass
R-9.5cic
R-13.3ci
Metal buildings
R-19ci
R-19ci
Steel framed
R-13 + 
R-10ci
R-19 + 
R-8.5ci
Wood framed and other
R-21 int
R-21 int
Walls, Below Grade
Below-grade walld
Same as above grade
Same as above grade
Floors
Massf
R-30ci
R-30ci
Joist/framing
R-30e
R-30e
Slab-on-Grade Floors
Unheated slabs
R-10 for 24" below
R-10 for 24" below
Heated slabs
R-10 perimeter & under entire slab
R-10 perimeter & under entire slab
Opaque Doors
Nonswinging
R-4.75
R-4.75
For SI:
1 inch = 25.4 mm. ci = Continuous insulation. NR = No requirement.
LS = 
Liner systemA continuous membrane installed below the purlins and uninterrupted by framing members. Uncompressed, unfaced insulation rests on top of the membrane between the purlins.
a
Assembly descriptions can be found in Chapter 2 and Appendix A.
b
Where using R-value compliance method, a thermal spacer block shall be provided, otherwise use the U-factor compliance method in Table C402.1.4.
c
Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following:
 
1. At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and
 
2. The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall R-value from Table C402.1.3/U-factor from Table C402.1.4.
d
Where heated slabs are below grade, below-grade walls shall comply with the exterior insulation requirements for heated slabs.
e
Steel floor joist systems shall be insulated to R-38 + R-10ci.
f
"Mass floors" shall include floors weighing not less than:
1. 35 pounds per square foot of floor surface area; or
2. 25 pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot.
g
For roof, wall or floor assemblies where the proposed assembly would not be continuous insulation, an alternate nominal R-value compliance option for assemblies with isolated metal penetrations of otherwise continuous insulation is:
Assemblies with continuous
insulation (see definition)
Alternate option for assemblies with metal penetrations, greater than 0.04% but less than 0.08%
Alternate option for assemblies with metal penetrations, greater than or equal to 0.08% but less than 0.12%
R-9.5ci
R-11.9ci
R-13ci
R-11.4ci
R-14.3ci
R-15.7ci
R-13.3ci
R-16.6ci
R-18.3ci
R-15.2ci
R-19.0ci
R-21ci
R-30ci
R-38ci
R-42ci
R-38ci
R-48ci
R-53ci
R-13 + R-7.5ci
R-13 + R-9.4ci
R-13 + R-10.3ci
R-13 + R-10ci
R-13 + R-12.5ci
R-13 + R-13.8ci
R-13 + R-12.5ci
R-13 + R-15.6ci
R-13 + R-17.2ci
R-13 + R-13ci
R-13 + R-16.3ci
R-13 + R-17.9ci
R-19 + R-8.5ci
R-19 + R-10.6ci
R-19 + R-11.7ci
R-19 + R-14ci
R-19 + R-17.5ci
R-19 + R-19.2ci
R-19 + R-16ci
R-19 + R-20ci
R-19 + R-22ci
R-20 + R-3.8ci
R-20 + R-4.8ci
R-20 + R-5.3ci
R-21 + R-5ci
R-21 + R-6.3ci
R-21 + R-6.9ci
This alternate nominal R-value compliance option is allowed for projects complying with all of the following:
1.
The ratio of the cross-sectional area, as measured in the plane of the surface, of metal penetrations of otherwise continuous insulation to the opaque surface area of the assembly is greater than 0.0004 (0.04%), but less than 0.0012 (0.12%).
2.
The metal penetrations of otherwise continuous insulation are isolated or discontinuous (e.g., brick ties or other discontinuous metal attachments, offset brackets supporting shelf angles that allow insulation to go between the shelf angle and the primary portions of the wall structure). No continuous metal elements (e.g., metal studs, z-girts, z-channels, shelf angles) penetrate the otherwise continuous portion of the insulation.
3.
Building permit drawings shall contain details showing the locations and dimensions of all the metal penetrations (e.g., brick ties or other discontinuous metal attachments, offset brackets, etc.) of otherwise continuous insulation. In addition, calculations shall be provided showing the ratio of the cross-sectional area of metal penetrations of otherwise continuous insulation to the overall opaque wall area.
For other cases where the proposed assembly is not continuous insulation, see Section C402.1.4 for determination of U-factors for assemblies that include metal other than screws and nails.
AMENDATORY SECTION (Amending WSR 14-24-122, filed 12/3/14, effective 1/3/15)
WAC 51-11C-40213 Section C402.1.3((Component performance option)) Insulation component R-value method.
((C402.1.3 Component performance building envelope option.
C402.1.3.1 General. Buildings or structures whose design heat loss rate (UAp) and solar heat gain coefficient rate (SHGC * Ap) are less than or equal to the target heat loss rate (UAt) and solar heat gain coefficient rate (SHGC * At) shall be considered in compliance with this section. The stated U-factor, F-factor or allowable area of any component assembly, listed in Table C402.1.2 and Table C402.3, such as roof/ceiling, opaque wall, opaque door, fenestration, floor over conditioned space, slab-on-grade floor, radiant floor or opaque floor may be increased and the U-factor or F-factor for other components decreased, provided that the total heat gain or loss for the entire building envelope does not exceed the total resulting from compliance to the U-factors, F-factors or allowable areas specified in this section. Compliance shall be calculated in total for the building envelope for other than Group R spaces and for Group R spaces.
C402.1.3.2 Component U-factors. The U-factors for typical construction assemblies are included in Chapter 3 and Appendix A. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Chapter 3 or Appendix A, values shall be calculated in accordance with the ASHRAE Handbook—Fundamentals, using the framing factors listed in Appendix A.
For envelope assemblies containing metal framing, the U-factor shall be determined by one of the following methods:
1. Results of laboratory measurements according to acceptable methods of test.
2. ASHRAE Handbook—Fundamentals where the metal framing is bonded on one or both sides to a metal skin or covering.
3. The zone method as provided in ASHRAE Handbook—Fundamentals.
4. Effective framing/cavity R-values as provided in Appendix A.
When return air ceiling plenums are employed, the roof/ceiling assembly shall:
a. For thermal transmittance purposes, not include the ceiling proper nor the plenum space as part of the assembly; and
b. For gross area purposes, be based upon the interior face of the upper plenum surface.
5. Tables in ASHRAE 90.1-2010 Normative Appendix A.
C402.1.3.3 UA calculations. The target UAt and the proposed UAp shall be calculated using Equations C402-1 and C402-2 and the corresponding areas and U-factors from Table C402.1.2 and Table C402.3. For the target UAt calculation, the skylights shall be located in roof/ceiling area up to the maximum skylight area per Section C402.3.1 and the remainder of the fenestration allowed per Section C402.3.1 shall be located in the wall area.
C402.1.3.4 SHGC rate calculations. Solar heat gain coefficient shall comply with Table C402.3. The target SHGCAt and the proposed SHGCAp shall be calculated using Equations C402-3 and C402-4 and the corresponding areas and SHGCs from Table C402.3.)) C402.1.3 Insulation component R-value-based method. Building thermal envelope opaque assemblies shall meet the requirements of Section C402.2 and C402.4 based on the climate zone specified in Chapter 3. For opaque portions of the building thermal envelope intended to comply on an insulation component R-value basis, the R-values for insulation in framing areas, where required, and for continuous insulation, where required, shall not be less than that specified in Table C402.1.3. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the R-values from the "Group R" column of Table C402.1.3. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the R-values from the "All other" column of Table C402.1.3. The thermal resistance or R-value of the insulating material installed in, or continuously on, below grade exterior walls of the building envelope required in accordance with Table C402.1.3 shall extend to the lowest floor of the conditioned space enclosed by the below grade wall. Doors having less than 50 percent opaque glass area shall be considered opaque doors. Opaque swinging doors shall comply with the Table C402.1.4 and opaque nonswinging doors shall comply with Table C402.1.3 or C402.1.4.
AMENDATORY SECTION (Amending WSR 14-24-122, filed 12/3/14, effective 1/3/15)
WAC 51-11C-402131 ((Equation C402-1—Target UAt.)) Reserved.
((Equation C402-1
Target UAt
UAt
=
UradtAradt + UmrtAmrt + UratArat + Umwt(Amwt + Amwbgt) + Umbwt(Ambwt + Ambwbgt) + Usfwt(Asfwt + Asfwbgt) + Uwfwt(Awfwt + Awfwbgt) + UfmtAfmt + UfjtAfjt + FstPst + FsrtPsrt + UdstAdst + UdrtAdrt + UvgtAvgt + UvgmtAvgmt + UvgmotAvgmot + UvgdtAvgdt + UogtAogt
 
UAt
=
The target combined specific heat transfer of the gross roof/ceiling assembly, exterior wall and floor area.
 
Where:
 
Uradt
=
The thermal transmittance value for roofs with the insulation entirely above deck found in Table C402.1.2.
 
Umrt
=
The thermal transmittance value for metal building roofs found in Table C402.1.2.
 
Urat
=
The thermal transmittance value for attic and other roofs found in Table C402.1.2.
 
Umwt
=
The thermal transmittance value for opaque mass walls found in Table C402.1.2.
 
Umbwt
=
The thermal transmittance value for opaque metal building walls found in Table C402.1.2.
 
Usfwt
=
The thermal transmittance value for opaque steel-framed walls found in Table C402.1.2.
 
Uwfwt
=
The thermal transmittance value for opaque wood framed and other walls found in Table C402.1.2.
 
Ufmt
=
The thermal transmittance value for mass floors over unconditioned space found in Table C402.1.2.
 
Ufjt
=
The thermal transmittance value for joist floors over unconditioned space found in Table C402.1.2.
 
Fst
=
The F-factor for slab-on-grade floors found in Table C402.1.2.
 
Fsrt
=
The F-factor for radiant slab floors found in Table C402.1.2.
 
Udst
=
The thermal transmittance value for opaque swinging doors found in Table C402.2.
 
Udrt
=
The thermal transmittance value for opaque roll-up or sliding doors found in Table C402.2.
 
Uvgt
=
The thermal transmittance value for vertical fenestration with nonmetal framing found in Table C402.3 which corresponds to the proposed vertical fenestration area as a percent of gross exterior wall area. *Buildings utilizing Section C402.3.1.3 shall use the thermal transmittance value specified there.
 
Uvgmt
=
The thermal transmittance value for vertical fenestration with fixed metal framing found in Table C402.3 which corresponds to the proposed vertical fenestration area as a percent of gross exterior wall area. *Buildings utilizing Section C402.3.1.3 shall use the thermal transmittance value specified there.
 
Uvgmot
=
The thermal transmittance value for vertical fenestration with operable metal framing found in Table C402.3 which corresponds to the proposed vertical fenestration area as a percent of gross exterior wall area. *Buildings utilizing Section C402.3.1.3 shall use the thermal transmittance value specified there.
 
Uvgdt
=
The thermal transmittance value for entrance doors found in Table C402.3 which corresponds to the proposed vertical fenestration area as a percent of gross exterior wall area. Buildings utilizing Section C402.3.1.3 shall use the thermal transmittance value specified there.
 
Uogt
=
The thermal transmittance for skylights found in Table C402.3 which corresponds to the proposed skylight area as a percent of gross exterior roof area.
 
Afmt
=
The proposed mass floor over unconditioned space area, Afm.
 
Afjt
=
The proposed joist floor over unconditioned space area, Afj.
 
Pst
=
The proposed linear feet of slab-on-grade floor perimeter, Ps.
 
Psrt
=
The proposed linear feet of radiant slab floor perimeter, Prs.
 
Adst
=
The proposed opaque swinging door area, Ads.
 
Adrt
=
The proposed opaque roll-up or sliding door area, Adr.
 
and
 
 
If the vertical fenestration area as a percent of gross above-grade exterior wall area does not exceed the maximum allowed in Section C402.3.1.3:
 
Amwt
=
The proposed opaque above grade mass wall area, Amw.
 
Amwbgt
=
The proposed opaque below grade mass wall area, Amw.
 
Ambwt
=
The proposed opaque above grade metal building wall area, Ambw.
 
Ambwbgt
=
The proposed opaque below grade metal building wall area, Ambwbg.
 
Asfwt
=
The proposed opaque above grade steel framed wall area, Amfw.
 
Asfwbgt
=
The proposed opaque below grade steel framed wall area, Amfwbg.
 
Awfwt
=
The proposed opaque above grade wall wood framed and other area, Awfwbg.
 
Awfwbgt
=
The proposed opaque below grade wall wood framed and other area, Awfwbg.
 
Avgt
=
The proposed vertical fenestration area with nonmetal framing, Avg.
 
Avgmt
=
The proposed vertical fenestration area with fixed metal framing, Avgm.
 
Avgmot
=
The proposed vertical fenestration area with operable metal framing, Avgmo.
 
Avgdt
=
The proposed entrance door area, Avgd.
 
or
 
 
If the vertical fenestration area as a percent of gross above-grade exterior wall area exceeds the maximum allowed in Section C402.3.1, the area of each vertical fenestration element shall be reduced in the base envelope design by the same percentage and the net area of each above-grade wall type increased proportionately by the same percentage so that the total vertical fenestration area is exactly equal to the allowed percentage per Section C402.3.1 of the gross above-grade wall area. The target wall area of a given wall type shall be the sum of the proposed below grade area and the increased above-grade area.
 
and
 
 
If the skylight area as a percent of gross exterior roof area does not exceed the maximum allowed in Section C402.3.1:
 
Aradt
=
The proposed roof area with insulation entirely above the deck, Arad.
 
Amrt
=
The proposed roof area for metal buildings, Amr.
 
Arat
=
The proposed attic and other roof area, Aor.
 
Aogat
=
The proposed skylight area, Aogor.
 
or
 
 
If the skylight area as a percent of gross exterior roof area exceeds the maximum allowed in Section C402.3.1, the area of each skylight element shall be reduced in the base envelope design by the same percentage and the net area of each roof type increased proportionately by the same percentage so that the total skylight area is exactly equal to the allowed percentage per Section C402.3.1 of the gross roof area.
*Note:
The vertical fenestration area does not include opaque doors and opaque spandrel panels.))
AMENDATORY SECTION (Amending WSR 13-23-096, filed 11/20/13, effective 4/1/14)
WAC 51-11C-402132 ((Equation C402-2—Proposed UAp.)) Reserved.
((Equation C402-2
Proposed UAp
UAp
=
UradArad + UmrAmr + UraAra + UmwAmw + UmbwAmbw + UsfwAsfw + UwfowAwfow + UfmAfm + UfjAfj + FsPs + FsrPsr + UdsAds + UdrAdr + UvgAvg + UvgmfAvgmf + UvgmoAvgmo + UvgdAvgd + UogAog
 
Where:
 
UAp
=
The combined proposed specific heat transfer of the gross exterior wall, floor and roof/ceiling assembly area.
 
Urad
=
The thermal transmittance of the roof area where the insulation is entirely above the roof deck.
 
Arad
=
Opaque roof area where the insulation is entirely above the roof deck.
 
Umr
=
The thermal transmittance of the metal building roof area.
 
Amr
=
Opaque metal building roof area.
 
Ura
=
The thermal transmittance of the roof over attic and other roof area.
 
Ara
=
Opaque roof over attic and other roof area.
 
Umw
=
The thermal transmittance of the opaque mass wall area.
 
Amw
=
Opaque mass wall area (not including opaque doors).
 
Umbw
=
The thermal transmittance of the opaque metal building wall area.
 
Ambw
=
Opaque metal building wall area (not including opaque doors).
 
Usfw
=
The thermal transmittance of the opaque steel framed wall area.
 
Asfw
=
Opaque steel framed wall area (not including opaque doors).
 
Uwfw
=
The thermal transmittance of the opaque wood framed and other wall area.
 
Awfw
=
Opaque wood framed and other wall area (not including opaque doors).
 
Ufm
=
The thermal transmittance of the mass floor over unconditioned space area.
 
Afm
=
Mass floor area over unconditioned space.
 
Ufj
=
The thermal transmittance of the joist floor over unconditioned space area.
 
Afj
=
Joist floor area over unconditioned space.
 
Fs
=
Slab-on-grade floor component F-factor.
 
Ps
=
Linear feet of slab-on-grade floor perimeter.
 
Fsr
=
Radiant floor component F-factor.
 
Psr
=
Lineal feet of radiant floor perimeter.
 
Uds
=
The thermal transmittance value of the opaque swinging door area.
 
Ads
=
Opaque swinging door area.
 
Udr
=
The thermal transmittance value of the opaque roll-up or sliding door area.
 
Adr
=
Opaque roll-up or sliding door area.
 
Uvg
=
The thermal transmittance of the vertical fenestration area with nonmetal framing.*
 
Avg
=
Vertical fenestration area with nonmetal framing.*
 
Uvgmf
=
The thermal transmittance of the vertical fenestration area with fixed metal framing.
 
Avgmf
=
Vertical fenestration area with fixed metal framing.*
 
Uvgmo
=
The thermal transmittance of the vertical fenestration area with operable metal framing.*
 
Avgmo
=
Vertical fenestration area with operable metal framing.*
 
Uvgd
=
The thermal transmittance of the vertical fenestration area for entrance doors.
 
Avgd
=
Vertical fenestration area for entrance doors.
 
Uog
=
The thermal transmittance for the skylights.
 
Aog
=
Skylight area.
NOTE:
Where more than one type of wall, window, roof/ceiling, door and skylight is used, the U and A terms for those items shall be expanded into subelements as:
Umw1Amw1 + Umw2Amw2 + Usfw1Asfw1 + ...etc.
*NOTE:
The vertical fenestration area does not include opaque doors and opaque spandrel panels.))
AMENDATORY SECTION (Amending WSR 13-23-096, filed 11/20/13, effective 4/1/14)
WAC 51-11C-402133 ((Equation C402-3—Target SHGCAt.)) Reserved.
((Equation C402-3
Target SHGCAt
SHGCAt
=
SHGCogt(Aogort + SHGCvgt (Aogt + Avgt + Avgmt + Avgmot + Avgdt)
Where:
SHGCAt
=
The target combined solar heat gain of the target fenestration area.
SHGCogt
=
The solar heat gain coefficient for skylight fenestration found in Table C402.3, and Aogt, as defined in Equation C402-1.
SHGCvgt
=
The solar heat gain coefficient for vertical fenestration found in Table C402.3 which corresponds to the proposed total fenestration area as a percent of gross exterior wall area, and Avgt, Avgmt, Avgmot and Avgdt are defined under Equation C402-1. Buildings utilizing Section C402.3.1.3 shall use the SHGC value specified there. The SHGC may be adjusted for projection factors per the requirements of Section C402.3.3.
NOTE:
The vertical fenestration area does not include opaque doors and opaque spandrel panels.))
AMENDATORY SECTION (Amending WSR 13-23-096, filed 11/20/13, effective 4/1/14)
WAC 51-11C-402134 ((Equation C402-4—Proposed SHGCAp.)) Reserved.
((Equation C402-4
Proposed SHGCAp
SHGCAp
=
SHGCogAog + SHGCvgAvg
Where:
SHGCAt
=
The combined proposed solar heat gain of the proposed fenestration area.
SHGCog
=
The solar heat gain coefficient of the skylights.
Aog
=
The skylight area.
SHGCvg
=
The solar heat gain coefficient of the vertical fenestration.
Avg
=
The vertical fenestration area.
NOTE:
The vertical fenestration area does not include opaque doors and opaque spandrel panels.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40214 Section C402.1.4((Semi-heated spaces)) Assembly U-factor, C-factor, or F-factor-based method.
C402.1.4 ((Semi-heated spaces. All spaces shall comply with the requirements in Section C402 unless they meet the definition for semi-heated spaces. For semi-heated spaces, the building envelope shall comply with the same requirements as that for conditioned spaces in Section C402; however, for semi-heated spaces heated by other than electric resistance heating equipment, wall insulation is not required for those walls that separate semi-heated spaces from the exterior provided that the space meets all the requirements of semi-heated space. Semi-heated spaces shall be calculated separately from other conditioned spaces for compliance purposes. Building envelope assemblies separating conditioned space from semi-heated space shall comply with exterior envelope insulation requirements. When choosing the uninsulated wall option, the wall shall not be included in Component Performance Building Envelope Option calculation.)) Assembly U-factor, C-factor, or F-factor-based method. Building thermal envelope opaque assemblies intended to comply on an assembly U-, C-, or F-factor basis shall have a U-, C-, or F-factor not greater than that specified in Table C402.1.4. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the U-, C-, or F-factor from the "Group R" column of Table C402.1.4. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the U-, C-, or F-factor from the "All other" column of Table C402.1.4. The C-factor for the below-grade exterior walls of the building envelope, as required in accordance with Table C402.1.4, shall extend to the level of the lowest conditioned floor. Opaque swinging doors shall comply with Table C402.1.4 and opaque nonswinging doors shall comply with Table C402.1.3 or C402.1.4. The U-factors for typical construction assemblies are included in Appendix A. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Appendix A, values shall be calculated in accordance with the ASHRAE HandbookFundamentals using the framing factors listed in Appendix A where applicable and shall include the thermal bridging effects of framing materials.
C402.1.4.1 Thermal resistance of cold-formed steel walls. U-factors of walls with cold-formed steel studs shall be permitted to be determined in accordance with Equation 4-1:
Equation 4-1:
U = 1/[Rs + (ER)]
Where:
Rs
=
The cumulative R-value of the wall components along the path of heat transfer, excluding the cavity insulation and steel studs.
ER
=
The effective R-value of the cavity insulation with steel studs.
Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.
NEW SECTION
WAC 51-11C-402141 Table C402.1.4Opaque thermal envelope requirements, U-factor method.
Table C402.1.4
Opaque Thermal Envelope Requirementsa,f
CLIMATE ZONE
5 AND MARINE 4
 
All Other
Group R
Roofs
Insulation entirely above deck
U-0.027
U-0.027
Metal buildings
U-0.031
U-0.031
Attic and other
U-0.021
U-0.021
Joist or single rafter
U-0.027
U-0.027
Walls, Above Grade
Mass
U-0.104d
U-0.078
Mass transfer deck slab edge
U-0.20
U-0.20
Metal building
U-0.052
U-0.052
Steel framed
U-0.055
U-0.055
Wood framed and other
U-0.054
U-0.054
Walls, Below Grade
Below-grade wallb
Same as above grade
Same as above grade
Floors
Masse
U-0.031
U-0.031
Joist/framing
U-0.029
U-0.029
Slab-on-Grade Floors
Unheated slabs
F-0.54
F-0.54
Heated slabsc
F-0.55
F-0.55
Opaque Doors
Swinging
U-0.37
U-0.37
Nonswinging
U-0.34
U-0.34
a
Use of opaque assembly U-factors, C-factors, and F-factors from Appendix A is required unless otherwise allowed by Section C402.1.4.
b
Where heated slabs are below grade, below-grade walls shall comply with the F-factor requirements for heated slabs.
c
Heated slab F-factors shall be determined specifically for heated slabs. Unheated slab factors shall not be used.
d
Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following:
 
1. At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and
 
2. The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall R-value from Table C402.1.3/U-factor from Table C402.1.4.
e
"Mass floors" shall include floors weighing not less than:
1. 35 pounds per square foot of floor surface area; or
2. 25 pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot.
f
Opaque assembly U-factors based on designs tested in accordance with ASTM C1363 shall be permitted. The R-value of continuous insulation shall be permitted to be added or substracted from the original test design.
NEW SECTION
WAC 51-11C-402142 Table C402.1.4.1Effective R-values for steel stud wall assemblies.
Table C402.1.4.1
Effective R-values For Steel Stud Wall Assemblies
NOMINAL STUD DEPTH (inches)
SPACING OF FRAMING (inches)
CAVITY R-VALUE
(insulation)
CORRECTION FACTOR (Fc)
EFFECTIVE
R-VALUE (ER)
(Cavity R-Value x Fc)
 
3 1/2
16
13
0.46
5.98
 
15
0.43
6.45
 
3 1/2
24
13
0.55
7.15
 
15
0.52
7.80
 
6
16
19
0.37
7.03
 
21
0.35
7.35
 
6
24
19
0.45
8.55
 
21
0.43
9.03
 
8
16
25
0.31
7.75
 
24
25
0.38
9.50
NEW SECTION
WAC 51-11C-40215 Section C402.1.5Component performance alternative.
C402.1.5 Component performance alternative. Building envelope values and fenestration areas determined in accordance with Equation 4-2 shall be permitted in lieu of compliance with the U-factors and F-factors in Table C402.1.4 and C402.4 and the maximum allowable fenestration areas in Section C402.4.1.
Equation 4-2
A + B + C + D = ≤ Zero
Where:
A =
Sum of the (UA Dif) values for each distinct assembly type of the building thermal envelope, other than slabs on grade and below-grade walls
 
UA Dif
=
UA Proposed – UA Table
 
UA Proposed
=
Proposed U-value x Area
 
UA Table
=
(U-factor from Table C402.1.4 or C402.4 or Section C402.1.3) x Area
B =
Sum of the (FL Dif) values for each distinct slab on grade perimeter condition of the building thermal envelope
 
FL Dif
=
FL Proposed – FL Table
 
FL Proposed
=
Proposed F-value x Perimeter length
 
FL Table
=
(F-factor specified in Table C402.1.4) x Perimeter length
The maximum allowed prescriptive vertical fenestration area as a percent of the gross above-grade wall area ratio is either:
 
1.
30%
 
2.
40% if the building complies with Section C402.4.1.1; or
 
3.
40% if the U-values used in calculating A for vertical fenestration are taken from Section C402.4.1.3 rather than Table C402.4
Where the proposed vertical fenestration area is less than or equal to the maximum allowed prescriptive vertical fenestration area, the value of D (Excess Vertical Glazing Value) shall be zero. Otherwise:
C =
(CA x UV) – (CA x UWall), but not less than zero
 
CA
=
(Proposed Vertical Fenestration Area) – (Vertical Fenestration Area allowed)
 
UA Wall
=
Sum of the (UA Proposed) values for each opaque assembly of the exterior wall
 
UAW
=
Sum of the (UA proposed) values for each above-grade wall assembly
 
UWall
=
UAW/sum of wall area (excludes vertical fenestration area)
 
UAV
=
Sum of the (UA Proposed) values for each vertical fenestration assembly
 
UV
=
UAV/total vertical fenestration area
Where the proposed skylight area is less than or equal to the skylight area allowed by Section C402.4.1, the value of E (Excess Skylight Value) shall be zero. Otherwise:
D =
(DA x US) – (DA x URoof), but not less than zero
 
DA
=
(Proposed Skylight Area) – (Allowable Skylight Area from Section C402.4.1)
 
UAR
=
Sum of the (UA Proposed) values for each roof assembly
 
URoof
=
UAR/sum of roof area (excludes skylight area)
 
UAS
=
Sum of the (UA Proposed) values for each skylight assembly
 
US
=
UAS/total skylight area
C402.1.5.1 Component U-factors. The U-factors for typical construction assemblies are included in Chapter 3 and Appendix A. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Chapter 3 or Appendix A, values shall be calculated in accordance with the ASHRAE HandbookFundamentals, using the framing factors listed in Appendix A.
For envelope assemblies containing metal framing, the U-factor shall be determined by one of the following methods:
1. Results of laboratory measurements according to acceptable methods of test.
2. ASHRAE HandbookFundamentals where the metal framing is bonded on one or both sides to a metal skin or covering.
3. The zone method as provided in ASHRAE HandbookFundamentals.
4. Effective framing/cavity R-values as provided in Appendix A.
When return air ceiling plenums are employed, the roof/ceiling assembly shall:
a. For thermal transmittance purposes, not include the ceiling proper nor the plenum space as part of the assembly; and
b. For gross area purposes, be based upon the interior face of the upper plenum surface.
5. Tables in ASHRAE 90.1-2010 Normative Appendix A.
C402.1.5.2 SHGC rate calculations. Solar heat gain coefficient shall comply with Table C402.4. The target SHGCAt and the proposed SHGCAp shall be calculated using Equations 4-3 and 4-4 and the corresponding areas and SHGCs from Table C402.4.
Equation 4-3Target SHGCAt
Equation C402-3
Target SHGCAt
SHGCAt
=
SHGCogt(Aogt) + SHGCvgt (Avgt + Avgmt + Avgmot + Avgdt)
Where:
SHGCAt
=
The target combined solar heat gain of the target fenestration area.
SHGCogt
=
The solar heat gain coefficient for skylight fenestration found in Table C402.3.
Aogt
=
The proposed skylight area.
SHGCvgt
=
The solar heat gain coefficient for vertical fenestration found in Table C402.3. Buildings utilizing Section C402.3.1.3 shall use the SHGC value specified there. The SHGC may be adjusted for projection factors per the requirements of Section C402.3.
Avgt
=
The proposed vertical fenestration area with nonmetal framing.
Avgmt
=
The proposed vertical fenestration area with fixed metal framing.
Avgmot
=
The proposed vertical fenestration area with operable metal framing.
Avgdt
=
The proposed vertical fenestration area of entrance doors.
NOTE:
The vertical fenestration area does not include opaque doors and opaque spandrel panels.
Equation 4-4
Proposed SHGCAp
SHGCAp
=
SHGCogAog + SHGCvgAvg
Where:
SHGCAt
=
The combined proposed solar heat gain of the proposed fenestration area.
SHGCog
=
The solar heat gain coefficient of the skylights.
Aog
=
The skylight area.
SHGCvg
=
The solar heat gain coefficient of the vertical fenestration.
Avg
=
The vertical fenestration area.
NOTE:
The vertical fenestration area does not include opaque doors and opaque spandrel panels.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40220 Section C402.2Specific insulation requirements.
C402.2 Specific building thermal envelope insulation requirements (Prescriptive). ((Opaque assemblies shall comply with Table C402.2. Where two or more layers of continuous insulation board are used in a construction assembly, the continuous insulation boards shall be installed in accordance with Section C303.2. If the continuous insulation board manufacturer's installation instructions do not address installation of two or more layers, the edge joints between each layer of continuous insulation boards shall be staggered.)) Insulation in building thermal envelope opaque assemblies shall comply with Sections C402.2.1 through C402.2.6 and Table C402.1.3.
AMENDATORY SECTION (Amending WSR 13-23-096, filed 11/20/13, effective 4/1/14)
WAC 51-11C-402200 ((Table C402.2Opaque thermal envelope requirements.)) Reserved.
((Table C402.2
Opaque Thermal Envelope Requirementsa, f
CLIMATE ZONE
5 AND MARINE 4
6
 
All Other
Group R
All Other
Group R
Roofs
Insulation entirely above deck
R-30ci
R-38ci
R-30ci
R-38ci
Metal buildings (with R-3.5
thermal blocks)a, b
R-25 + 
R-11 LS
R-25 + 
R-11 LS
R-25 + 
R-11 LS
R-30 + 
R-11 LS
Attic and other
R-49
R-49
R-49
R-49
Walls, Above Grade
Massc
R-9.5ci
R-13.3ci
R-11.4ci
R-15.2ci
Metal building
R-13 + 
R-13ci
R-13 + 
R-13ci
R-13 + 
R-13ci
R-19 + 
R-16ci
Steel framed
R-13 + 
R-10ci
R-19 + 
R-8.5ci
R-13 + 
R-12.5ci
R-19 + 
R-14ci
Wood framed and other
R-21 int
R-21 int
R-13 + 
R-7.5ci or R-20 + R-3.8ci
R-21 + 
R-5ci
Walls, Below Grade
Below-grade walld
Same as above grade
Same as above grade
Same as above grade
Same as above grade
Floors
Mass
R-30ci
R-30ci
R-30ci
R-30ci
Joist/framing
R-30e
R-30e
R-38e
R-38e
Slab-on-Grade Floors
Unheated slabs
R-10 for 24" below
R-10 for 24" below
R-10 for 48" below
R-15 for 48" below
Heated slabsd
R-10 perimeter & under entire slab
R-10 perimeter & under entire slab
R-10 perimeter & under entire slab
R-10 perimeter & under entire slab
Opaque Doors
Swinging
U-0.37
U-0.37
U-0.37
U-0.37
Roll-up or sliding
R-4.75
R-4.75
R-4.75
R-4.75
For SI:
1 inch = 25.4 mm. ci = Continuous insulation. NR = No requirement.
LS = 
Liner system—A continuous membrane installed below the purlins and uninterrupted by framing members. Uncompressed, unfaced insulation rests on top of the membrane between the purlins.
a
Assembly descriptions can be found in Chapter 2 and Appendix A.
b
Where using R-value compliance method, a thermal spacer block shall be provided, otherwise use the U-factor compliance method in Table C402.1.2.
c
Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following:
1 At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and
2 The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall R-factor from Table C402.2 or U-factor from Table C402.1.2.
d
Where heated slabs are below grade, below-grade walls shall comply with the exterior insulation requirements for heated slabs.
e
Steel floor joist systems shall be insulated to R-38 + R-10ci.
f
For roof, wall or floor assemblies where the proposed assembly would not be continuous insulation, an alternate nominal R-value compliance options for assemblies with isolated metal penetrations of otherwise continuous insulation is:
Assemblies with continuous
insulation (see definition)
Alternate option for assemblies with metal penetrations, greater than 0.04% but less than 0.08%
R-11.4ci
R-14.3ci
R-13.3ci
R-16.6ci
R-15.2ci
R-19.0ci
R-30ci
R-38ci
R-38ci
R-48ci
R-13 + R-7.5ci
R-13 + R-9.4ci
R-13 + R-10ci
R-13 + R-12.5ci
R-13 + R-12.5ci
R-13 + R-15.6ci
R-13 + R-13ci
R-13 + R-16.3ci
R-19 + R-8.5ci
R-19 + R-10.6ci
R-19 + R-14ci
R-19 + R-17.5ci
R-19 + R-16ci
R-19 + R-20ci
R-20 + R-3.8ci
R-20 + R-4.8ci
R-21 + R-5ci
R-21 + R-6.3ci
This alternate nominal R-value compliance option is allowed for projects complying with all of the following:
1.
The ratio of the cross-sectional area, as measured in the plane of the surface, of metal penetrations of otherwise continuous insulation to the opaque surface area of the assembly is greater than 0.0004 (0.04%), but less than 0.0008 (0.08%).
2.
The metal penetrations of otherwise continuous insulation are isolated or discontinuous (e.g., brick ties or other discontinuous metal attachments, offset brackets supporting shelf angles that allow insulation to go between the shelf angle and the primary portions of the wall structure). No continuous metal elements (e.g., metal studs, z-girts, z-channels, shelf angles) penetrate the otherwise continuous portion of the insulation.
3.
Building permit drawings shall contain details showing the locations and dimensions of all the metal penetrations (e.g., brick ties or other discontinuous metal attachments, offset brackets, etc.) of otherwise continuous insulation. In addition, calculations shall be provided showing the ratio of the cross-sectional area of metal penetrations of otherwise continuous insulation to the overall opaque wall area.
For other cases where the proposed assembly is not continuous insulation, see Section C402.1.2 for determination of U-factors for assemblies that include metal other than screws and nails.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40221 Section C402.2.1((Roof assembly)) Multiple layers of continuous insulation.
((C402.2.1 Roof assembly. The minimum thermal resistance (R-value) of the insulating material installed either between the roof framing or continuously on the roof assembly shall be as specified in Table C402.2, based on construction materials used in the roof assembly. Skylight curbs shall be insulated to the level of roofs with insulation entirely above deck or R-5, whichever is less.
EXCEPTIONS:
1. Continuously insulated roof assemblies where the thickness of insulation varies 1 inch (25 mm) or less and where the area-weighted U-factor is equivalent to the same assembly with the R-value specified in Table C402.2.
 
2. Unit skylight curbs included as a component of an NFRC 100 rated assembly shall not be required to be insulated.
Insulation installed on a suspended ceiling with removable ceiling tiles shall not be considered part of the minimum thermal resistance of the roof insulation.
C402.2.1.1 Roof solar reflectance and thermal emittance. Low-sloped roofs, with a slope less than 2 units vertical in 12 horizontal, directly above cooled conditioned spaces in Climate Zones 1, 2, and 3 shall comply with one or more of the options in Table C402.2.1.1.
EXCEPTIONS:
The following roofs and portions of roofs are exempt from the requirements in Table C402.2.1.1:
 
1. Portions of roofs that include or are covered by:
 
1.1. Photovoltaic systems or components.
 
1.2. Solar air or water heating systems or components.
 
1.3. Roof gardens or landscaped roofs.
 
1.4. Above-roof decks or walkways.
 
1.5. Skylights.
 
1.6. HVAC systems, components, and other opaque objects mounted above the roof.
 
2. Portions of roofs shaded during the peak sun angle on the summer solstice by permanent features of the building, or by permanent features of adjacent buildings.
 
3. Portions of roofs that are ballasted with a minimum stone ballast of 17 pounds per square foot (psf) (74 kg/m2) or 23 psf (117 kg/m2) pavers.
 
4. Roofs where a minimum of 75 percent of the roof area meets a minimum of one of the exceptions above.))
C402.2.1 Multiple layers of continuous insulation. Where two or more layers of continuous insulation board are used in a construction assembly, the continuous insulation boards shall be installed in accordance with Section C303.2. If the continuous insulation board manufacturer's installation instructions do not address installation of two or more layers, the edge joints between each layer of continuous insulation boards shall be staggered.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-402211 ((Table C402.2.1.1Reflectance and emittance options.)) Reserved.
((Table C402.2.1.1
Reflectance and Emittance Optionsa
Three-year aged solar reflectanceb of 0.55 and three-year aged thermal emittancec of 0.75
Initial solar reflectanceb of 0.70 and initial thermal emittancec of 0.75
Three-year-aged solar reflectance indexd of 64 initial solar reflectance indexd of 82
a
The use of area-weighted averages to meet these requirements shall be permitted. Materials lacking initial tested values for either solar reflectance or thermal emittance, shall be assigned both an initial solar reflectance of 0.10 and an initial thermal emittance of 0.90. Materials lacking three-year aged tested values for either solar reflectance or thermal emittance shall be assigned both a three-year aged solar reflectance of 0.10 and a three-year aged thermal emittance of 0.90.
b
Solar reflectance tested in accordance with ASTM C 1549, ASTM E 903 or ASTM E 1918.
c
Thermal emittance tested in accordance with ASTM C 1371 or ASTM E 408.
d
Solar reflectance index (SRI) shall be determined in accordance with ASTM E 1980 using a convection coefficient of 2.1 Btu/h x ft2 x °F (12W/m2 x K). Calculation of aged SRI shall be based on aged tested values of solar reflectance and thermal emittance. Calculation of initial SRI shall be based on initial tested values of solar reflectance and thermal emittance.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40222 Section C402.2.2((Classification of walls)) Roof assembly.
C402.2.2 ((Classification of walls. Walls associated with the building envelope shall be classified in accordance with Section C202.)) Roof assembly. The minimum thermal resistance (R-value) of the insulating material installed either between the roof framing or continuously on the roof assembly shall be as specified in Table C402.1.3, based on construction materials used in the roof assembly. Skylight curbs shall be insulated to the level of roofs with insulation entirely above deck or R-5, whichever is less.
EXCEPTIONS:
1. Continuously insulated roof assemblies where the thickness of insulation varies 1 inch (25 mm) or less and where the area-weighted U-factor is equivalent to the same assembly with the R-value specified in Table C402.1.3.
 
2. Where tapered insulation is used with insulation entirely above deck, those roof assemblies shall show compliance on a U-factor basis per Section C402.1.4. The effective U-factor shall be determined through the use of Tables A102.2.6(1), A102.2.6(2) and A102.2.6(3).
 
3. Unit skylight curbs included as a component of a skylight listed and labeled in accordance with NFRC 100 shall not be required to be insulated.
Insulation installed on a suspended ceiling with removable ceiling tiles shall not be considered part of the minimum thermal resistance of the roof insulation.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40223 Section C402.2.3Above-grade walls.
C402.2.3 Thermal resistance of above-grade walls. The minimum thermal resistance (R-value) of ((the insulating)) materials installed in the wall cavity between the framing members and continuously on the walls shall be as specified in Table ((C402.2)) C402.1.3, based on framing type and construction materials used in the wall assembly. The R-value of integral insulation installed in concrete masonry units (CMU) shall not be used in determining compliance with Table ((C402.2)) C402.1.3.
"Mass walls" shall include walls ((weighing not less than)):
1. Weighing not less than 35 psf (170 kg/m2) of wall surface area((; or)).
2. Weighing not less than 25 psf (120 kg/m2) of wall surface area ((if)) where the material weight is not more than 120 pounds per cubic foot (pcf) (1,900 kg/m3).
3. Having a heat capacity exceeding 7 Btu/ft2 x °F (144 kJ/m2 x K).
4. Having a heat capacity exceeding 5 Btu/ft2 x °F (103 kJ/m2 x K) where the material weight is not more than 120 pcf (1900 kg/m3).
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40224 Section C402.2.4—Below-grade walls.
C402.2.4 Thermal resistance of below-grade walls. The minimum thermal resistance (R-value) of the insulating material installed in, or continuously on, the below-grade walls shall be as specified in Table ((C402.2)) C402.1.3.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40225 Section C402.2.5Floors ((over unconditioned space)).
((C402.2.5 Floors over outdoor air or unconditioned space. The minimum thermal resistance (R-value) of the insulating material installed either between the floor framing or continuously on the floor assembly shall be as specified in Table C402.2, based on construction materials used in the floor assembly.
"Mass floors" shall include floors weighing not less than:
1. 35 psf (170 kg/m2) of floor surface area; or
2. 25 psf (120 kg/m2) of floor surface area if the material weight is not more than 120 pcf (1,900 kg/m3).)) C402.2.5 Floors. The thermal properties (component R-values or assembly U- or F-factors) of floor assemblies over outdoor air or unconditioned space shall be as specified in Table C402.1.3 or C402.1.4 based on the construction materials used in the floor assembly. Floor framing cavity insulation or structural slab insulation shall be installed to maintain permanent contact with the underside of the subfloor decking or structural slabs.
EXCEPTIONS:
1. The floor framing cavity insulation or structural slab insulation shall be permitted to be in contact with the top side of sheathing or continuous insulation installed on the bottom side of floor assemblies where combined with insulation that meets or exceeds the minimum R-value in Table C401.1.3 for "Metal framed" or "Wood framed and other" values for "Walls, Above Grade" and extends from the bottom to the top of all perimeter floor framing or floor assembly members.
 
2. Insulation applied to the underside of concrete floor slabs shall be permitted an air space of not more than 1 inch where it turns up and is in contact with the underside of the floor under walls associated with the building thermal envelope.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40226 Section C402.2.6Slab-on-grade perimeter insulation.
C402.2.6 Slabs-on-grade perimeter insulation. Where the slab-on-grade is in contact with the ground, the minimum thermal resistance (R-value) of the insulation around the perimeter of unheated or heated slab-on-grade floors designed in accordance with the R-value method of Section C402.1.3 shall be as specified in Table ((C402.2)) C402.1.3. The insulation shall be placed on the outside of the foundation or on the inside of the foundation wall. The insulation shall extend downward from the top of the slab for a minimum distance as shown in the table or to the top of the footing, whichever is less, or downward to at least the bottom of the slab and then horizontally to the interior or exterior for the total distance shown in the table. Insulation extending away from the building shall be protected by pavement or by a minimum of 10 inches (254 mm) of soil. Insulation complying with Table C402.1.3 shall be provided under the entire area of heated slabs on grade.
EXCEPTION:
Where the slab-on-grade floor is greater than 24 inches (61 mm) below the finished exterior grade, perimeter insulation is not required.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40227 ((Section C402.2.7Opaque doors.)) Reserved.
((C402.2.7 Opaque doors. Opaque doors (doors having less than 50 percent glass area) shall meet the applicable requirements for doors as specified in Table C402.2 and be considered as part of the gross area of above-grade walls that are part of the building envelope.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40228 Section C402.2.8Insulation of radiant heating systems.
C402.2.8 Insulation of radiant heating systems. Radiant heating system panels, and their associated ((U-bends and headers, designed for sensible heating of an indoor space through heat transfer from the thermally effective panel surfaces to the occupants or indoor space by thermal radiation and natural convection and the bottom surfaces of floor structures incorporating radiant heating shall be insulated with a minimum of R-3.5 (0.62 m2/K × W))) components that are installed in interior or exterior assemblies shall be insulated with a minimum of R-3.5 (0.62 m2/K × W) on all surfaces not facing the space being heated. Radiant heating system panels that are installed in the building thermal envelope shall be separated from the exterior of the building or unconditioned or exempt spaces by not less than the R-value of insulation installed in the opaque assembly in which they are installed or the assembly shall comply with Section C402.1.4.
EXCEPTION:
Heated slabs on grade insulated in accordance with Section C402.2.6.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40230 Section ((C402.3)) C402.4Fenestration (Prescriptive).
C402.3 Reserved.
C402.4 Fenestration (Prescriptive). Fenestration shall comply with ((Table C402.3. Automatic daylighting controls specified by this section shall comply with Section C405.2.2.3.2)) Sections C402.4 through C402.4.4 and Table C402.4. Daylight responsive controls shall comply with this section and Section C405.2.4.1.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-402300 Table ((C402.3)) C402.4Building envelope requirementsFenestration.
Table ((C402.3)) C402.4
Building Envelope ((Requirements))Fenestration Maximum U-factor and SHGC Requirements
CLIMATE ZONE
5 AND MARINE 4
((6))
Vertical Fenestration
U-factor
 
 
Nonmetal framing (all)a
0.30
((0.30))
Metal framing (fixed)b
0.38
((0.36))
Metal framing (operable)c
0.40
((0.40))
Metal framing (entrance doors)d
0.60
((0.60))
SHGC
 
 
((SHGC
0.40
0.40))
Orientation
SEW
N
PF < 0.2
0.40
0.53
0.2 < PF < 0.5
0.48
0.58
PF ˃ 0.5
0.64
0.64
Skylights
U-factor
0.50
((0.50))
SHGC
0.35
((0.35))
NR =
No requirement.
 
a "Nonmetal framing" includes framing materials other than metal, with or without metal reinforcing or cladding.
 
b "Metal framing" includes metal framing, with or without thermal break. "Fixed" includes curtain wall, storefront, picture windows, and other fixed windows.
 
c "Metal framing" includes metal framing, with or without thermal break. "Operable" includes openable fenestration products other than "entrance doors."
 
d "Metal framing" includes metal framing, with or without thermal break. "Entrance door" includes glazed swinging entrance doors. Other doors which are not entrance doors, including sliding glass doors, are considered "operable."
AMENDATORY SECTION (Amending WSR 13-23-096, filed 11/20/13, effective 4/1/14)
WAC 51-11C-40231 Section ((C402.3.1)) C402.4.1Maximum area.
((C402.3.1)) C402.4.1 Maximum area. The vertical fenestration area (not including opaque doors and opaque spandrel panels) shall not exceed 30 percent of the gross above-grade wall area. The skylight area shall not exceed ((3)) 5 percent of the gross roof area.
((C402.3.1.1)) C402.4.1.1 Increased vertical fenestration area with ((daylighting)) daylight responsive controls. ((In Climate Zones 1 through 6,)) A maximum of 40 percent of the gross above-grade wall area shall be permitted to be vertical fenestration for the purpose of prescriptive compliance with Section C402.1.4 or for the component performance alternative in Section C402.1.5, provided all of the following requirements are met:
1. In buildings not greater than two stories above grade, no less than 50 percent of the conditioned floor area is within a daylight zone((;)).
2. ((Automatic daylighting)) In buildings three or more stories above grade, not less than 25 percent of the net floor area is within a daylight zone.
3. Daylight responsive controls complying with Section C405.2.4.1 are installed in daylight zones((; and
3)).
4. Visible transmittance (VT) of vertical fenestration is greater than or equal to 1.1 times solar heat gain coefficient (SHGC).
EXCEPTION:
Fenestration that is outside the scope of NFRC 200 is not required to comply with Item ((3)) 4.
((C402.3.1.2 Increased skylight area with daylighting controls. The skylight area shall be permitted to be a maximum of 5 percent of the roof area provided automatic daylighting controls are installed in daylight zones under skylights.
C402.3.1.3)) C402.4.1.2 Reserved.
C402.4.1.3 Increased vertical fenestration area with high-performance fenestration. The vertical fenestration area (not including opaque doors and opaque spandrel panels) is permitted to exceed 30 percent but shall not exceed 40 percent of the gross above grade wall area, for the purpose of prescriptive compliance with Section ((C402.1.2 or for the target UA calculation in Equation C402-1,)) C402.1.3 provided that each of the following conditions are met:
1. The vertical fenestration shall have the following U-factors:
a. Nonmetal framing (all) = 0.28
b. Metal framing (fixed) = 0.34
c. Metal framing (operable) = 0.36
d. Metal framing (entrance doors) = 0.60
2. The SHGC of the vertical fenestration shall be less than or equal to 0.35, adjusted for projection factor in compliance with ((C402.3.3.1)) C402.4.3.
An area-weighted average shall be permitted to satisfy the U-factor requirement for each fenestration product category listed in Item 1 of this section. Individual fenestration products from different fenestration product categories shall not be combined in calculating the area-weighted average U-factor.
The compliance path described in this section is not permitted to be used for the total building performance compliance path in Section C407. The compliance path described in this section is permitted to be used for the component performance alternative in Section C402.1.5, provided that the requirements of Section C402.1.5 are met.
C402.4.1.4 Increased vertical fenestration area with high-performance mechanical systems. The vertical fenestration area (not including opaque doors and opaque spandrel panels) is permitted to exceed 30 percent but shall not exceed 40 percent of the gross above-grade wall area, for the purpose of prescriptive compliance with Section C402.1.4 or for the component performance alternative in Section C402.1.5, provided that the mechanical system complies with all requirements of Section C403.6 Dedicated outdoor air systems (DOAS) without utilizing the exceptions to Section C403.6. This increased glazing fraction is not permitted to be used to establish the reference case for the Total Building Performance compliance path in Section C407.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40232 Section ((C402.3.2)) C402.4.2Minimum skylight fenestration area.
((C402.3.2)) C402.4.2 Minimum skylight fenestration area. For single story buildings only, in an enclosed space greater than ((10,000)) 2,500 square feet (((929)) 232 m2) in floor area, directly under a roof with not less than 75 percent of the ceiling area with a ceiling height((s)) greater than 15 feet (4572 mm), and used as an office, lobby, atrium, concourse, corridor, gymnasium/exercise center, convention center, automotive service, manufacturing, nonrefrigerated warehouse, retail store, distribution/sorting area, transportation, or workshop, ((the total daylight zone under skylights shall be)) skylights are required to provide a total toplight daylight zone area not less than half the floor area and shall provide ((a minimum skylight area to daylight zone under skylights of either)) one of the following:
1. A minimum skylight area to toplight area under skylights of not less than 3 percent ((with a)) where all skylights have a VT of at least 0.40((; or)) as determined in accordance with Section C303.1.3.
2. ((Provide)) A minimum skylight effective aperture of at least 1 percent determined in accordance with Equation ((C4-1)) 4-5.
 
Skylight Effective Aperture
=
(0.85 x Skylight Area x Skylight VT x WF)/Daylight zone under skylight
 
(Equation ((C4-1)) 4-5)
Where:
 
Skylight area
=
Total fenestration area of skylights.
Skylight VT
=
Area weighted average visible transmittance of skylights.
WF
=
Area weighted average well factor, where well factor is 0.9 if light well depth is less than 2 feet (610 mm), or 0.7 if light well depth is 2 feet (610 mm) or greater.
Light well depth
=
Measure vertically from the underside of the lowest point of the skylight glazing to the ceiling plane under the skylight.
EXCEPTION:
Skylights above daylight zones of enclosed spaces are not required in:
 
1. ((Buildings in Climate Zones 6 through 8.)) Reserved.
 
2. Spaces where the designed general lighting power densities are less than 0.5 W/ft2 (5.4 W/m2).
 
3. Areas where it is documented that existing structures or natural objects block direct beam sunlight on at least half of the roof over the enclosed area for more than 1,500 daytime hours per year between 8 a.m. and 4 p.m.
 
4. Spaces where the daylight zone under rooftop monitors is greater than 50 percent of the enclosed space floor area.
 
5. Spaces where the total floor area minus the sidelight daylight zone area is less than 2,500 square feet (232 m2), and where the lighting in the daylight zone is controlled in accordance with Section C405.2.3.1.
((C402.3.2.1)) C402.4.2.1 Lighting controls in daylight zones under skylights. ((All lighting in the daylight zone shall be controlled by automatic daylighting controls that comply with Section C405.2.2.3.2.
EXCEPTION:
Skylights above daylight zones of enclosed spaces are not required in:
 
1. Buildings in Climate Zones 6 through 8.
 
2. Spaces where the designed general lighting power densities are less than 0.5 W/ft2 (5.4 W/m2).
 
3. Areas where it is documented that existing structures or natural objects block direct beam sunlight on at least half of the roof over the enclosed area for more than 1,500 daytime hours per year between 8 a.m. and 4 p.m.
 
4. Spaces where the daylight zone under rooftop monitors is greater than 50 percent of the enclosed space floor area.
C402.3.2.2)) Daylight responsive controls complying with Section C405.2.4.1 shall be provided to control all electric lights within daylight zones.
C402.4.2.2 Haze factor. Skylights in office, storage, automotive service, manufacturing, nonrefrigerated warehouse, retail store, and distribution/sorting area spaces shall have a glazing material or diffuser with a ((measured)) haze factor greater than 90 percent when tested in accordance with ASTM D 1003.
EXCEPTION:
Skylights designed and installed to exclude direct sunlight entering the occupied space by the use of fixed or automated baffles, or the geometry of skylight and light well ((need not comply with Section C402.3.2.2)).
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40233 Section ((C402.3.3)) C402.4.3Maximum U-factor and SHGC.
((C402.3.3)) C402.4.3 Maximum U-factor and SHGC. ((For vertical fenestration,)) The maximum U-factor and solar heat gain coefficient (SHGC) for fenestration shall be as specified in Table ((C402.3, based on the window projection factor. For skylights, the maximum U-factor and solar heat gain coefficient (SHGC) shall be as specified in Table C402.3)) C402.4.
The window projection factor shall be determined in accordance with Equation ((C4-2)) 4-6.
PF = A/B
(Equation ((C4-2)) 4-6)
Where:
 
PF
=
Projection factor (decimal).
A
=
Distance measured horizontally from the furthest continuous extremity of any overhang, eave, or permanently attached shading device to the vertical surface of the glazing.
B
=
Distance measured vertically from the bottom of the glazing to the underside of the overhang, eave, or permanently attached shading device.
Where different windows or glass doors have different PF values, they shall each be evaluated separately.
((C402.3.3.1 SHGC adjustment. Where the fenestration projection factor for a specific vertical fenestration product is greater than or equal to 0.2, the required maximum SHGC from Table C402.3 shall be adjusted by multiplying the required maximum SHGC by the multiplier specified in Table C402.3.3.1 corresponding with the orientation of the fenestration product and the projection factor.
Table C402.3.3.1
SHGC Adjustment Multipliers
PROJECTION
FACTOR
ORIENTED WITHIN 45 DEGREES OF TRUE NORTH
ALL OTHER ORIENTATION
0.2 ≤ PF < 0.5
1.1
1.2
PF ≥ 0.5
1.2
1.6
C402.3.3.2 Increased vertical fenestration SHGC. In Climate Zones 1, 2 and 3, vertical fenestration entirely located not less than 6 feet (1729 mm) above the finished floor shall be permitted a maximum SHGC of 0.40.
C402.3.3.3 Reserved.
C402.3.3.4 Reserved.
C402.3.3.5 Dynamic glazing. For compliance with Section C402.3.3, the SHGC for dynamic glazing shall be determined using the manufacturer's lowest-rated SHGC, and the VT/SHGC ratio shall be determined using the maximum VT and maximum SHGC. Dynamic glazing shall be considered separately from other fenestration, and area-weighted averaging with other fenestration that is not dynamic glazing shall not be permitted.)) C402.4.3.1 Reserved.
C402.4.3.2 Reserved.
C402.4.3.3 Dynamic glazing. Where dynamic glazing is intended to satisfy the SHGC and VT requirements of Table C402.4, the ratio of the higher to lower labeled SHGC shall be greater than or equal to 2.4, and the dynamic glazing shall be automatically controlled to modulate the amount of solar gain into the space in multiple steps. Dynamic glazing shall be considered separately from other fenestration, and area-weighted averaging with other fenestration that is not dynamic glazing shall not be permitted.
EXCEPTION:
Dynamic glazing is not required to comply with this section where both the lower and higher labeled SHGC already comply with the requirements of Table C402.4.
C402.4.3.4 Area-weighted U-factor. An area-weighted average shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.4. Individual fenestration products from different fenestration product categories listed in Table C402.4 shall not be combined in calculating area-weighted average U-factor.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40234 Section ((C402.3.4Area-weighted U-factor)) C402.4.4Doors.
((C402.3.4 Area-weighted U-factor. An area-weighted average shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.3. Individual fenestration products from different fenestration product categories listed in Table C402.3 shall not be combined in calculating area-weighted average U-factor.)) C402.4.4 Doors. Opaque doors shall comply with the applicable requirements for doors as specified in Tables C402.1.3 and C402.1.4 and be considered part of the gross area of above grade walls that are part of the building thermal envelope. Other doors shall comply with the provisions of Section C402.4.3 for vertical fenestration.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40240 Section ((C402.4)) C402.5Air leakage-thermal envelope.
((C402.4)) C402.5 Air leakage-thermal envelope (Mandatory). The thermal envelope of buildings shall comply with Sections ((C402.4.1 through C402.4.8)) C402.5.1 through C402.5.8.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40241 Section ((C402.4.1)) C402.5.1Air barriers.
((C402.4.1)) C402.5.1 Air barriers. A continuous air barrier shall be provided throughout the building thermal envelope. The air barriers shall be permitted to be located on the inside or outside of the building envelope, located within the assemblies composing the envelope, or any combination thereof. The air barrier shall comply with Sections ((C402.4.1.1 and C402.4.1.2)) C402.5.1.1 and C402.5.1.2.
((EXCEPTION:
Air barriers are not required in buildings located in Climate Zones 1, 2 and 3.
C402.4.1.1)) C402.5.1.1 Air barrier construction. The continuous air barrier shall be constructed to comply with the following:
1. The air barrier shall be continuous for all assemblies that are the thermal envelope of the building and across the joints and assemblies.
2. Air barrier joints and seams shall be sealed, including sealing transitions in places and changes in materials. ((Air barrier penetrations shall be sealed in accordance with Section C402.4.2.)) The joints and seals shall be securely installed in or on the joint for its entire length so as not to dislodge, loosen or otherwise impair its ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation.
3. Penetrations of the air barrier shall be caulked, gasketed or otherwise sealed in a manner compatible with the construction materials and location. Joints and seals associated with penetrations shall be sealed in the same manner or taped or covered with moisture vapor-permeable wrapping material. Sealing materials shall be appropriate to the construction materials being sealed and shall be securely installed around the penetration so as not to dislodge, loosen or otherwise impair the penetrations' ability to resist positive and negative pressure from wind, stack effect, and mechanical ventilation. Sealing of concealed fire sprinklers, where required, shall be in a manner that is recommended by the manufacturer. Caulking or other adhesive sealants shall not be used to fill voids between fire sprinkler cover plates and walls or ceilings.
4. Recessed lighting fixtures shall comply with Section ((C404.2.8)) C402.5.8. Where similar objects are installed which penetrate the air barrier, provisions shall be made to maintain the integrity of the air barrier.
((EXCEPTION:
Buildings that comply with Section C402.4.1.2.3 are not required to comply with Items 1 and 3.
C402.4.1.2 Air barrier compliance options. A continuous air barrier for the opaque building envelope shall comply with Section C402.4.1.2.3.
C402.4.1.2.1 Materials. Materials with an air permeability no greater than 0.004 cfm/ft2 (0.02 L/s • m2) under a pressure differential of 0.3 inches water gauge (w.g.) (75 Pa) when tested in accordance with ASTM E 2178 shall comply with this section. Materials in Items 1 through 15 shall be deemed to comply with this section provided joints are sealed and materials are installed as air barriers in accordance with the manufacturer's instructions.
1. Plywood with a thickness of not less than 3/8 inch (10 mm).
2. Oriented strand board having a thickness of not less than 3/8 inch (10 mm).
3. Extruded polystyrene insulation board having a thickness of not less than 1/2 inch (12 mm).
4. Foil-back polyisocyanurate insulation board having a thickness of not less than 1/2 inch (12 mm).
5. Closed cell spray foam a minimum density of 1.5 pcf (2.4 kg/m3) having a thickness of not less than 1 1/2 inches (36 mm).
6. Open cell spray foam with a density between 0.4 and 1.5 pcf (0.6 and 2.4 kg/m3) and having a thickness of not less than 4.5 inches (113 mm).
7. Exterior or interior gypsum board having a thickness of not less than 1/2 inch (12 mm).
8. Cement board having a thickness of not less than 1/2 inch (12 mm).
9. Built up roofing membrane.
10. Modified bituminous roof membrane.
11. Fully adhered single-ply roof membrane.
12. A Portland cement/sand parge, or gypsum plaster having a thickness of not less than 5/8 inch (16 mm).
13. Cast-in-place and precast concrete.
14. Fully grouted concrete block masonry.
15. Sheet steel or aluminum.
C402.4.1.2.2 Assemblies. Assemblies of materials and components with an average air leakage not to exceed 0.04 cfm/ft2 (0.2 L/s • m2) under a pressure differential of 0.3 inches of water gauge (w.g.)(75 Pa) when tested in accordance with ASTM E 2357, ASTM E 1677 or ASTM E 283 shall comply with this section. Assemblies listed in Items 1 and 2 shall be deemed to comply provided joints are sealed and requirements of Section C402.4.1.1 are met.
1. Concrete masonry walls coated with one application either of block filler and two applications of a paint or sealer coating;
2. A Portland cement/sand parge, stucco or plaster minimum 1/2 inch (12 mm) in thickness.
C402.4.1.2.3)) 5. Construction documents shall contain a diagram showing the building's pressure boundary in plan(s) and section(s) and a calculation of the area of the pressure boundary to be considered in the test.
C402.5.1.2 Building test. The completed building shall be tested and the air leakage rate of the building envelope shall not exceed 0.40 cfm/ft2 at a pressure differential of 0.3 inches water gauge (2.0 L/s • m2 at 75 Pa) at the upper 95 percent confidence interval in accordance with ASTM E 779 or an equivalent method approved by the code official. A report that includes the tested surface area, floor area, air by volume, stories above grade, and leakage rates shall be submitted to the building owner and the Code Official. If the tested rate exceeds that defined here, a visual inspection of the air barrier shall be conducted and any leaks noted shall be sealed to the extent practicable. An additional report identifying the corrective actions taken to seal air leaks shall be submitted to the building owner and the Code Official and any further requirement to meet the leakage air rate will be waived.
1. Test shall be accomplished using either (1) both pressurization and depressurization or (2) pressurization alone, but not depressurization alone. The test results shall be plotted against the corrected P in accordance with Section 9.4 of ASTM E 779.
2. The test pressure range shall be from 25 Pa to 80 Pa per Section 8.10 of ASTM E 779, but the upper limit shall not be less than 50 Pa, and the difference between the upper and lower limit shall not be less than 25 Pa.
3. If the pressure exponent n is less than 0.45 or greater than 0.85 per Section 9.6.4 of ASTM E 779, the test shall be rerun with additional readings over a longer time interval.
C402.5.1.2.1 Building test for mixed-use buildings. Where a building is three or fewer stories above grade plane and contains both commercial and residential uses, the air barrier of the R-2 and R-3 occupancy areas of the building is permitted to be separately tested according to Section R402.4.1.2. Alternatively, it is permissible to test the air barrier of the entire building according to Section C402.5.1.2, provided that the tested air leakage rate does not exceed the rate specified in Section C402.5.1.2.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40242 ((Section C402.4.2—Air barrier penetrations.)) Reserved.
((C402.4.2 Air barrier penetrations. Penetrations of the air barrier and paths of air leakage shall be caulked, gasketed or otherwise sealed in a manner compatible with the construction materials and location. Joints and seals shall be sealed in the same manner or taped or covered with a moisture vapor-permeable wrapping material. Sealing materials shall be appropriate to the construction materials being sealed. The joints and seals shall be securely installed in or on the joint for its entire length so as not to dislodge, loosen or otherwise impair its ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40243 Section ((C402.4.3Air leakage of fenestration)) C402.5.3Rooms containing fuel-burning appliances.
((C402.4.3 Air leakage of fenestration. The air leakage of fenestration assemblies shall meet the provisions of Table C402.4.3. Testing shall be in accordance with the applicable reference test standard in Table C402.4.3 by an accredited, independent testing laboratory and labeled by the manufacturer.
EXCEPTIONS:
1. Field-fabricated fenestration assemblies that are sealed in accordance with Section C402.4.1.
 
2. Fenestration in buildings that comply with Section C402.4.1.2.3 are not required to meet the air leakage requirements in Table C402.4.3.
 
3. Custom exterior windows and doors manufactured by a small business provided they meet the applicable provisions of Chapter 24 of the International Building Code. Once visual inspection has confirmed the presence of a gasket, operable windows and doors manufactured by small business shall be permitted to be sealed off at the frame prior to the test.
Table C402.4.3
Maximum Air Infiltration Rate
for Fenestration Assemblies
FENESTRATION ASSEMBLY
MAXIMUM RATE
(CFM/FT2)
TEST PROCEDURE
Windows
0.20a
AAMA/WDMA/CSA101/I.S.2/A440
or
NFRC 400
Sliding doors
0.20a
Swinging doors
0.20a
Skylights - With condensation weepage openings
0.30
Skylights - All other
0.20a
Curtain walls
0.06
NFRC 400 or
Storefront glazing
0.06
ASTM E 283 at
Commercial glazed swinging entrance doors
1.00
1.57 psf
(75 Pa)
Revolving doors
1.00
Garage doors
0.40
ANSI/DASMA 105,
NFRC 400, or
Rolling doors
1.00
ASTM E 283 at
1.57 psf (75 Pa)
For SI:
1 cubic foot per minute = 0.47 L/s, 1 square foot = 0.093 m2.
a
The maximum rate for windows, sliding and swinging doors, and skylights is permitted to be 0.3 cfm per square foot of fenestration or door area when tested in accordance with AAMA/WDMA/CSA101/I.S.2/A440 at 6.24 psf (300 Pa).))
C402.5.3 Rooms containing fuel-burning appliances. Where open combustion air ducts provide combustion air to open combustion space conditioning fuel-burning appliances, the appliances and combustion air openings shall be located outside of the building thermal envelope or enclosed in a room isolated from inside the thermal envelope. Such rooms shall be sealed and insulated in accordance with the envelope requirements of Table C402.1.3 or C402.1.4, where the walls, floors and ceilings shall meet the minimum of the below-grade wall R-value requirement. The door into the room shall be fully gasketed, and any water lines and ducts in the room insulated in accordance with Section C403. The combustion air duct shall be insulated, where it passes through conditioned space, to a minimum of R-8.
EXCEPTIONS:
1. Direct vent appliances with both intake and exhaust pipes installed continuous to the outside.
 
2. Fireplaces and stoves complying with Sections 901 through 905 of the International Mechanical Code, and Section 2111.13 of the International Building Code.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40244 Section ((C402.4.4)) C402.5.4Doors and access openings.
((C402.4.4)) C402.5.4 Doors and access openings to shafts, chutes, stairways, and elevator lobbies. Doors and access openings from conditioned space to shafts, chutes, stairways and elevator lobbies ((shall either meet the requirements of Section C402.4.3 or)) shall be gasketed, weatherstripped or sealed.
EXCEPTIONS:
1. Door openings required to comply with Section 715 or 715.4 of the International Building Code((; or doors and door openings required by the International Building Code to comply with UL 1784 shall not be required to comply with Section C402.4.4)).
 
2. Doors and door openings required to comply with UL 1784 by the International Building Code.
AMENDATORY SECTION (Amending WSR 14-24-054, filed 11/25/14, effective 5/1/15)
WAC 51-11C-40245 Section ((C402.4.5)) C402.5.5Air intakes, exhaust openings, stairways and shafts.
((C402.4.5)) C402.5.5 Air intakes, exhaust openings, stairways and shafts. Stairway enclosures ((and)), elevator shaft vents and other outdoor air intakes and exhaust openings integral to the building envelope shall be provided with dampers in accordance with Section((s C402.4.5.1 and C402.4.5.2.
C402.4.5.1 Stairway and shaft vents. Stairway and shaft vents shall be provided with Class I motorized dampers with a maximum leakage rate of 4 cfm/ft2 (20.3 L/s • m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D.
Stairway and shaft vent dampers shall be installed with controls so that they are capable of automatically opening upon:
1. The activation of any fire alarm initiating device of the building's fire alarm system; or
2. The interruption of power to the damper.
C402.4.5.2 Outdoor air intakes, exhaust outlets, relief outlets, and return openings. Outdoor air supply, exhaust openings and relief outlets shall be provided with Class I motorized dampers which close automatically when the system is off. Dampers shall have a maximum leakage rate of 4 cfm/ft2 (20.3 L/s • m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D.
Return air openings used for airside economizer operation shall be equipped with Class I motorized dampers. Dampers shall have a maximum leakage rate of 4 cfm/ft2 (20.3 L/s • m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D.
See also section C403.2.4.4 for additional requirements from damper shut-off controls.
EXCEPTIONS:
1. Gravity (nonmotorized) dampers having a maximum leakage rate of 20 cfm/ft2 (101.6 L/s • m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D are permitted to be used for relief openings in buildings less than three stories in height above grade if equipment has less than 5,000 cfm total supply flow. Gravity (nonmotorized) dampers for ventilation air intakes shall be protected from direct exposure to wind.
 
2. Gravity dampers smaller than 24 inches (610 mm) in either dimension shall be permitted to have a leakage of 40 cfm/ft2 (203.2 L/s • m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D.
 
3. Gravity (nonmotorized) dampers in Group R occupancies where the design outdoor air intake or exhaust capacity does not exceed 400 cfm (189 L/s).
 
4. Motorized dampers on return air openings in unitary packaged equipment that have the minimum leakage rate available from the manufacturer shall be deemed to comply.))
C403.2.4.3.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40246 Section ((C402.4.6)) C402.5.6Loading dock weatherseals.
((C402.4.6)) C402.5.6 Loading dock weatherseals. Cargo doors and loading dock doors shall be equipped with weatherseals to restrict infiltration when vehicles are parked in the doorway.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40247 Section ((C402.4.7)) C402.5.7Vestibules.
((C402.4.7)) C402.5.7 Vestibules. All building entrances shall be protected with an enclosed vestibule, with all doors opening into and out of the vestibule equipped with self-closing devices. Vestibules shall be designed so that in passing through the vestibule it is not necessary for the interior and exterior doors to open at the same time. The installation of one or more revolving doors in the building entrance shall not eliminate the requirement that a vestibule be provided on any doors adjacent to revolving doors. For the purposes of this section, "building entrances" shall include exit-only doors in buildings where separate doors for entering and exiting are provided.
Interior and exterior doors shall have a minimum distance between them of not less than 7 feet. The exterior envelope of conditioned vestibules shall comply with the requirements for a conditioned space. Either the interior or exterior envelope of unconditioned vestibules shall comply with the requirements for a conditioned space. The building lobby is not considered a vestibule.
((EXCEPTIONS:
1. Buildings in Climate Zones 1 and 2.
 
2. Doors not intended to be used by the public, such as doors to mechanical or electrical equipment rooms, or intended solely for employee use.
 
3. Doors opening directly from a sleeping unit or dwelling unit.
 
4. Doors that open directly from a space less than 3,000 square feet (298 m2) in area and are separate from the building entrance.
 
5. Revolving doors.
 
6. Doors used primarily to facilitate vehicular movement or material handling and adjacent personnel doors.
 
7. Building entrances in buildings that are less than four stories above grade and less than 10,000 ft2 in area.
 
8. Elevator doors in parking garages provided that the elevators have an enclosed lobby at each level of the garage.))
EXCEPTION:
Vestibules are not required for the following:
 
1. Doors not intended to be used as building entrances.
 
2. Unfinished ground-level space greater than 3,000 square feet (298 m2) if a note is included on the permit documents at each exterior entrance to the space stating "Vestibule required at time of tenant build-out if entrance serves a space greater than 3,000 square feet in area."
 
3. Doors opening directly from a sleeping unit or dwelling unit.
 
4. Doors between a space smaller than 3,000 square feet (298 m2) in area and the exterior of the building or the building entrance lobby, where those doors do not comprise one of the primary entrance paths to the remainder of the building.
 
5. Revolving doors.
 
6. Doors used primarily to facilitate vehicular movement or material handling and adjacent personnel doors.
 
7. In buildings less than 3 stories above grade or in spaces that do not directly connect with the building elevator lobby, doors that have an air curtain with a velocity of not less than 6.56 feet per second (2 m/s) at the floor that have been tested in accordance with ANSI/AMCA 220 and installed in accordance with the manufacturer's instructions. Manual or automatic controls shall be provided that will operate the air curtain with the opening and closing of the door. Air curtains and their controls shall comply with Section C408.2.3.
 
8. Building entrances in buildings that are less than four stories above grade and less than 10,000 ft2 in area.
 
9. Elevator doors in parking garages provided that the elevators have an enclosed lobby at each level of the garage.
 
10. Entrances to semi-heated spaces.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40248 Section ((C402.4.8)) C402.5.8Recessed lighting.
((C402.4.8)) C402.5.8 Recessed lighting. Recessed luminaires installed in the building thermal envelope shall be ((sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires shall be IC-rated and)) all of the following:
1. IC rated.
2. Labeled as having an air leakage rate of not more than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential.
((All recessed luminaires shall be)) 3. Sealed with a gasket or caulk between the housing and interior wall or ceiling covering.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40250 ((Section C402.5—Walk-in coolers and walk-in freezers.)) Reserved.
((C402.5 Walk-in coolers and walk-in freezers. Walk-in coolers and walk-in freezers shall comply with all of the following:
1. Shall be equipped with automatic door closers that firmly close walk-in doors that have been closed to within 1 inch of full closure.
EXCEPTION:
Doors wider than 3 feet 9 inches or taller than 7 feet.
2. Doorways shall have strip doors (curtains), spring-hinged doors, or other method of minimizing infiltration when doors are open.
3. Walk-in coolers shall contain wall, ceiling, and door insulation of at least R-25 and walk-in freezers at least R-32.
EXCEPTION:
Glazed portions of doors or structural members.
4. Walk-in freezers shall contain floor insulation of at least R-28.
5. Transparent reach-in doors for walk-in freezers and windows in walk-in freezer doors shall be of triple-pane glass, either filled with inert gas or with heat-reflective treated glass.
6. Transparent reach-in doors for walk-in coolers and windows in walk-in cooler doors shall be double-pane glass with heat-reflective treated glass and gas filled; or triple-pane glass, either filled with inert gas or with heat-reflective treated glass.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40260 ((Section C402.6—Refrigerated warehouse coolers and freezers.)) Reserved.
((C402.6 Refrigerated warehouse coolers and refrigerated warehouse freezers. Refrigerated warehouse coolers and refrigerated warehouse freezers shall comply with all of the following:
1. Shall be equipped with automatic door closers that firmly close walk-in doors that have been closed to within 1 inch of full closure.
EXCEPTION:
Doors wider than 3 feet 9 inches or taller than 7 feet.
2. Doorways shall have strip doors (curtains), spring-hinged doors, or other method of minimizing infiltration when doors are open.
3. Refrigerated warehouse coolers shall contain wall, ceiling, and door insulation of at least R-25 and refrigerated warehouse freezers at least R-32.
EXCEPTION:
Glazed portions of doors or structural members.
4. Refrigerated warehouse freezers shall contain floor insulation of at least R-28.
5. Transparent reach-in doors for refrigerated warehouse freezers and windows in refrigerated warehouse freezer doors shall be of triple-pane glass, either filled with inert gas or with heat-reflective treated glass.
6. Transparent reach-in doors for refrigerated warehouse coolers and windows in refrigerated warehouse cooler doors shall be double-pane glass with heat-reflective treated glass and gas filled; or triple-pane glass, either filled with inert gas or with heat-reflective treated glass.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40310 Section C403.1General.
C403.1 General. Mechanical systems and equipment serving heating, cooling, ventilating, and other needs shall comply with Section C403.2 (((referred to as the mandatory provisions) and either:
1. Section C403.3 (Simple systems); or
2. Section C403.4 (Complex systems).)) and shall comply with Sections C403.3 and C403.4 based on the equipment and systems provided.
EXCEPTION:
Energy using equipment used by a manufacturing, industrial or commercial process other than for conditioning spaces or maintaining comfort and amenities for the occupants and not otherwise regulated by C403.2.3, Tables(( C403.2.1)) C403.2.3 (1) through (((9))) (10) inclusive, C403.2.4.5, ((C403.2.5.4, C403.2.8, C403.2.13, C403.4.6, C403.5, C403.6, C404.2, or Table C404.2)) C403.2.4.6, C403.2.7, C403.2.9, C403.5.4, C404.2, Table C404.2, C405.8 and C410. Data center HVAC equipment is not covered by this exception.
((Walk-in coolers and walk-in freezers shall comply with Section C403.5. Refrigerated warehouse coolers and refrigerated warehouse freezers shall comply with Section C403.6.))
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40320 Section C403.2Provisions applicable to all mechanical systems.
C403.2 Provisions applicable to all mechanical systems (Mandatory). Mechanical systems and equipment serving the building heating, cooling or ventilating needs shall comply with Sections C403.2.1 through ((C403.2.11)) C403.2.13.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40321 Section C403.2.1Calculation of heating and cooling loads.
C403.2.1 Calculation of heating and cooling loads. Design loads associated with heating, ventilating and air conditioning of the building shall be determined in accordance with the procedures described in ANSI/ASHRAE/ACCA Standard 183((. The design loads shall account for the building envelope, lighting, ventilation and occupancy loads based on the project design)) or by an approved equivalent computational procedure, using the design parameters specified in Chapter 3. Heating and cooling loads shall be adjusted to account for load reductions that are achieved where energy recovery systems are utilized in the HVAC system in accordance with the ASHRAE HVAC Systems and Equipment Handbook((. Alternatively, design loads shall be determined by an approved equivalent computation procedure, using the design parameters specified in Chapter 3)) by an approved equivalent computational procedure.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40322 Section C403.2.2Equipment and systems sizing.
C403.2.2 Equipment and system sizing. The output capacity of heating and cooling equipment ((and systems shall not)) shall be no greater than that of the smallest available equipment size that exceeds the loads calculated in accordance with Section C403.2.1. A single piece of equipment providing both heating and cooling shall satisfy this provision for one function with the capacity for the other function as small as possible, within available equipment options.
EXCEPTIONS:
1. Required standby equipment and systems provided with controls and devices that allow such systems or equipment to operate automatically only when the primary equipment is not operating.
 
2. Multiple units of the same equipment type with combined capacities exceeding the design load and provided with controls that ((have the capability)) are configured to sequence the operation of each unit based on load.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-40323 Section C403.2.3HVAC equipment performance requirements.
C403.2.3 HVAC equipment performance requirements. Equipment shall meet the minimum efficiency requirements of Tables C403.2.3(1), C403.2.3(2), C403.2.3(3), C403.2.3(4), C403.2.3(5), C403.2.3(6), C403.2.3(7) ((and)), C403.2.3(8) and C403.2.3(9) when tested and rated in accordance with the applicable test procedure. Plate-type liquid-to-liquid heat exchangers shall meet the minimum requirements of Table C403.2.3(((9))) (10). The efficiency shall be verified through certification and listed under an approved certification program or, if no certification program exists, the equipment efficiency ratings shall be supported by data furnished by the manufacturer. Where multiple rating conditions or performance requirements are provided, the equipment shall satisfy all stated requirements. Where components, such as indoor or outdoor coils, from different manufacturers are used, calculations and supporting data shall be furnished by the designer that demonstrates that the combined efficiency of the specified components meets the requirements herein.
Gas-fired and oil-fired forced air furnaces with input ratings ≥ 225,000 Btu/h (65 kW) and all unit heaters shall also have an intermittent ignition or interrupted device (IID), and have either mechanical draft (including power venting) or a flue damper. A vent damper is an acceptable alternative to a flue damper for furnaces where combustion air is drawn from the conditioned space. All furnaces with input ratings ≥ 225,000 Btu/h (65 kW), including electric furnaces, that are not located within the conditioned space shall have jacket losses not exceeding 0.75 percent of the input rating.
Chilled water plants and buildings with more than 500 tons total capacity shall not have more than 100 tons provided by air-cooled chillers.
EXCEPTIONS:
1. Where the designer demonstrates that the water quality at the building site fails to meet manufacturer's specifications for the use of water-cooled equipment.
 
2. Air-cooled chillers with minimum efficiencies at least 10 percent higher than those listed in Table C403.2.3(7).
 
3. Replacement of existing equipment.
C403.2.3.1 Water-cooled centrifugal chilling packages. Equipment not designed for operation at AHRI Standard 550/590 test conditions of 44°F (7°C) leaving chilled-water temperature and 2.4 gpm/ton evaporator fluid flow and 85°F (29°C) entering condenser water temperature with 3 gpm/ton (0.054 ((I/s)) L/s • kW) condenser water flow shall have maximum full-load kW/ton (FL) and ((NPLV)) part-load ratings adjusted using Equations ((C4-3 and C4-4)) 4-7 and 4-8.
((Adjusted minimum full-load COP ratings
=
(Full-load COP from Table 6.8.1C of AHRI Standard 550/590)
×
Kadj
(Equation C4-3)
Adjusted minimum NPLV rating
=
(IPLV from Table 6.8.1C of AHRI Standard 550/590)
×
Kadj
(Equation C4-4)))
FL adj
=
FL/Kadj
(Equation 4-7)
PLVadj
=
IPLV/Kadj
(Equation 4-8)
 
 
 
Where:
 
Kadj
=
A × B
FL
=
Full-load kW/ton values as specified in Table C403.2.3(7)
FLadj
=
Maximum full-load kW/ton rating, adjusted for nonstandard conditions
IPLV
=
Value as specified in Table C403.2.3(7)
PLVadj
=
Maximum NPLV rating, adjusted for nonstandard conditions
A
=
((0.0000015318)) 0.00000014592 × (LIFT)4 - ((0.000202076)) 0.0000346496 × (LIFT)3 + ((0.0101800)) 0.00314196 × (LIFT)2 - ((0.264958)) 0.147199 × LIFT + ((3.930196)) 3.9302
B
=
((0.0027)) 0.0015 × Lvg Evap((C)) F) + ((0.982)) 0.934
LIFT
=
LvgCond - LvgEvap
LvgCond
=
Full-load condenser leaving ((water)) fluid temperature (((°C))) (°F)
LvgEvap
=
Full-load ((leaving)) evaporator leaving temperature (((°C))) (°F)
((SI units shall be used in the Kadj equation.))
The ((adjusted full-load and NPLV values shall only be)) FLadj and PLVadj values are only applicable for centrifugal chillers meeting all of the following full-load design ranges:
1. ((The leaving evaporator fluid temperature is not less than 36°F (2.2°C).
2. The leaving condenser fluid temperature is not greater than 115°F (46.1°C).)) Minimum evaporator leaving temperature: 36°F.
2. Maximum condenser leaving temperature: 115°F.
3. LIFT is not less than 20°F (11.1°C) and not greater than 80°F (44.4°C).
((EXCEPTION:
Centrifugal chillers designed to operate outside of these ranges need not comply with this code.))
C403.2.3.2 Positive displacement (air- and water-cooled) chilling packages. Equipment with a leaving fluid temperature higher than 32°F (0°C)((,)) and water-cooled positive displacement chilling packages with a condenser leaving fluid temperature below 115°F (46°C) shall meet the requirements of Table C403.2.3(7) when tested or certified with water at standard rating conditions, in accordance with the referenced test procedure.
C403.2.3.3 Packaged electric heating and cooling equipment. Packaged electric equipment providing both heating and cooling with a total cooling capacity greater than ((20,000)) 6,000 Btu/h shall be a heat pump.
EXCEPTION:
Unstaffed equipment shelters or cabinets used solely for personal wireless service facilities.
C403.2.3.4 Humidification. If an air economizer is required on a cooling system for which humidification equipment is to be provided to maintain minimum indoor humidity levels, then the humidifier shall be of the adiabatic type (direct evaporative media or fog atomization type).
EXCEPTIONS:
1. Health care facilities licensed by the state where ((WAC 246-320-525 allows only)) chapter 246-320 or 246-330 WAC requires steam injection humidifiers in duct work downstream of final filters.
 
2. Systems with water economizer.
 
3. 100% outside air systems with no provisions for air recirculation to the central supply fan.
 
4. Nonadiabatic humidifiers cumulatively serving no more than 10% of a building's air economizer capacity as measured in cfm. This refers to the system cfm serving rooms with stand alone or duct mounted humidifiers.
AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)
WAC 51-11C-403231 Table C403.2.3(1)Minimum efficiency requirementsElectrically operated unitary air conditioners and condensing units.
Table C403.2.3(1)A
Minimum Efficiency RequirementsElectrically Operated Unitary Air Conditioners and Condensing Units
 
 
 
 
((Minimum Efficiency
 
Equipment Type
Size Category
Heating Section Type
Subcategory or Rating Condition
Before 6/1/2011
As of 6/1/2011
Test Procedurea
Air conditioners, air cooled
< 65,000 Btu/hb
All
Split System
13.0 SEER
13.0 SEER
AHRI 210/240
 
 
Single Package
13.0 SEER
13.0 SEER
Through-the-wall (air cooled)
≤ 30,000 Btu/hb
All
Split System
12.0 SEER
12.0 SEER
 
 
Single Package
12.0 SEER
12.0 SEER
 
≥ 65,000 Btu/h and
< 135,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.2 EER
11.4 IEER
11.2 EER
11.4 IEER
 
 
 
All other
Split System and Single Package
11.0 EER
11.2 IEER
11.0 EER
11.2 IEER
 
Air conditioners, air cooled
≥ 135,000 Btu/h and < 240,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.0 EER
11.2 IEER
11.0 EER
11.2 IEER
AHRI 340/360
 
 
All other
Split System and Single Package
10.8 EER
11.0 IEER
10.8 EER
11.0 IEER
 
 
≥ 240,000 Btu/h and
< 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
10.0 EER
10.1 IEER
10.0 EER
10.1 IEER
 
 
 
All other
Split System and Single Package
9.8 EER
9.9 IEER
9.8 EER
9.9 IEER
 
 
≥760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
9.7 EER
9.8 IEER
9.7 EER
9.8 IEER
 
 
 
All other
Split System and Single Package
9.5 EER
9.6 IEER
9.5 EER
9.6 IEER
 
 
< 65,000 Btu/hb
All
Split System and Single Package
12.1 EER
12.3 IEER
12.1 EER
12.3 IEER
AHRI 210/240
 
≥ 65,000 Btu/h and
< 135,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.5 EER
11.7 IEER
12.1 EER
12.3 IEER
 
 
 
All other
Split System and Single Package
11.3 EER
11.5 IEER
11.9 EER
12.1 IEER
 
Air conditioners, water cooled
≥ 135,000 Btu/h and
< 240,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.0 EER
11.2 IEER
12.5 EER
12.7 IEER
AHRI 340/360
 
 
All other
Split System and Single Package
10.8 EER
11.0 IEER
12.3 EER
12.5 IEER
 
 
≥ 240,000 Btu/h and
< 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.0 EER
11.1 IEER
12.4 EER
12.6 IEER
 
 
 
All other
Split System and Single Package
10.8 EER
10.9 IEER
12.2 EER
12.4 IEER
 
 
≥ 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.0 EER
11.1 IEER
12.2 EER
12.4 IEER
 
 
 
All other
Split System and Single Package
10.8 EER
10.9 IEER
12.0 EER
12.2 IEER
 
 
< 65,000 Btu/hb
All
Split System and Single Package
12.1 EER
12.3 IEER
12.1 EER
12.3 IEER
AHRI 210/240
 
≥ 65,000 Btu/h and
< 135,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.5 EER
11.7 IEER
12.1 EER
12.3 IEER
 
 
 
All other
Split System and Single Package
11.3 EER
11.5 IEER
11.9 EER
12.1 IEER
 
Air conditioners,
evaporatively cooled
≥ 135,000 Btu/h and
< 240,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.0 EER
11.2 IEER
12.0 EER
12.2 IEER
AHRI 340/360
 
 
All other
Split System and Single Package
10.8 EER
11.0 IEER
11.8 EER
12.0 IEER
 
 
≥ 240,000 Btu/h and
< 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.0 EER
11.1 IEER
11.9 EER
12.1 IEER
 
 
 
All other
Split System and Single Package
10.8 EER
10.9 IEER
12.2 EER
11.9 IEER
 
 
≥ 760,000 Btu/h
Electric Resistance (or None)
Split System and Single Package
11.0 EER
11.1 EER
11.7 EER
11.9 EER
 
 
 
All other
Split System and Single Package
10.8 EER
10.9 EER