WSR 15-17-037

PROPOSED RULES

BUILDING CODE COUNCIL

[Filed August 12, 2015, 10:46 a.m.]

Original Notice.

Preproposal statement of inquiry was filed as WSR 15-10-079.

Title of Rule and Other Identifying Information: Adoption and amendment of the 2015 International Energy Conservation Code (IECC)/Washington State Energy Code (WSEC) (commercial), chapter 51-11C WAC.

Hearing Location(s): DES Presentation Room, 1500 Jefferson S.E., Olympia, WA 98504, on October 16, 2015, at 10 a.m.

Date of Intended Adoption: November 13, 2015.

Submit Written Comments to: Dave Kokot, Chair, State Building Code Council (SBCC), P.O. Box 41449, Olympia, WA 98504-1449, e-mail sbcc@ga.wa.gov, fax (360) 586-9088, by October 23, 2015.

Assistance for Persons with Disabilities: Contact Peggy Bryden by September 24, 2015, (360) 407-9280.

Purpose of the Proposal and Its Anticipated Effects, Including Any Changes in Existing Rules: The proposed 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 provided [provide] increased clarity and energy efficiency as required in RCW 19.27A.160.

Note: Sections that had no changes are not shown in this filing.

The 2015 WSEC contains several extensive reorganizational items:

Existing Buildings (2015 IECC Change). Provisions for existing buildings have been removed from Section C101.4 and elsewhere in the code and relocated to a new Chapter 5 and broken out into additions, alterations, repairs and change of use. (Proposed State Amendment.) An exception is added to Section C503.3 for air leakage testing of alteration, unless the alteration involves a change in space conditioning. Replacement exterior lighting and parking garage lighting is now addressed in the alterations Section C503.6.

Compliance Options (2015 IECC Change). Section C402.1 was extensively rewritten for the 2015 edition. The IECC added a component performance alternative, in Section C402.1.5, based on Washington's method. This new section replaces the old WSEC language. The prescriptive compliance path is now shown as a number list of items. The exception to C402.1 was moved to the list of exempt equipment buildings shown in C402.1.2. Low energy and semi-heated buildings were also moved into this section as subsections.

Refrigerated Spaces (2015 IECC Change/Proposed State Amendment). The 2015 IECC added requirements equivalent to those found in the 2012 WSEC. The 2015 WSEC relocates all of these requirements to a new Section C410. Duplicative language was removed and language was clarified. Federal efficiency tables were added. Use of the component performance method was clarified.

Economizers (2015 IECC Change/Proposed State Amendment). The 2015 IECC was reorganized to remove the division between simple systems and complex systems. All of the economizer requirements (and exceptions) were moved to C403.3. Much of C403.4 was moved into C403.3. Section C403.4.1.3 moved to C403.3.1 and was integrated into the ASHRAE 90.1 economizer control requirements. New requirements for modulating airflow units from ASHRAE are also added. Section C403.4.1.4 became Section C403.3.2. Section C403.3.1.1 became Section C403.3.3. Section C403.4.1.1 became Section C403.3.4.

Economizer Exceptions: Two new economizer exceptions were added for controlled atmosphere agricultural buildings and buildings utilizing waste heat for space heating or water heating. Exceptions for replacement equipment were moved to Chapter 5. The size limitation of the VRF exception was removed.

Lighting Controls (2015 IECC Change). The 2015 IECC reorganizes the lighting controls section significantly. It is broken into five main topics: Occupant sensors, time switches, manual control, daylight responsive controls and additional controls.

Commissioning (Proposed State Amendment). The term "certified commissioning professional" replaced most instances of "registered design professional" throughout this section. All of the documentation requirements were moved to Section C103.6. Commissioning plan was moved from Section C408.1.1 to C408.1.2 and revised to incorporate ASHRAE 202 requirements, as was the final commissioning report language. The checklist was revised to reflect the new section numbers and titles. System specific sections were revised to clarify exemptions and simplify language. The electrical section scope increased to all systems covered under Section C405.

As well as several new requirements:

DOAS (Proposed State Amendment). New Section C403.2.6.1 mandates dedicated outdoor air systems (DOAS) in certain occupancy types (office, retail, education, libraries and fire stations) to separate the ventilation system and heating/cooling system to reduce fan energy use. Section C403.2.6.1.1 allows the code official to waive this requirement if it is shown to be impractical. Section C403.2.6.1.2 sets fan control requirements for DOAS systems.

Section C406: Additional Efficiency Package Options (2015 IECC Change/Proposed State Amendment). The 2015 IECC revised the requirements for additional efficiency options, adding more options and simplifying the others provided. SBCC determined this would be an efficient, tested method of gaining energy efficiency and incorporated it into WSEC. All buildings are now required to achieve two credits from the available options. Based on the changes made to the LPA tables, the C406 LPA was reduced a further fifteen percent over the C405.2 values.

Controlled Receptacles (Proposed State Amendment). A new requirement was added in Section C405.10 for fifty percent of receptacles to be controlled by time switches or occupancy sensors.

Appendix E: Renewable Energy (Proposed State Amendment). A new appendix is included requiring commercial buildings to provide some type of renewable energy generation or energy recovery. This appendix is not adopted as a statewide requirement, but may be adopted by a local jurisdiction.

Other notable changes include:

Ventilation (Proposed State Amendment). Modification of Section C403.2.6 to limit the amount of outdoor air introduced into the building to reduce the amount of energy needed to heat/cool that air. Exceptions are provided for when needed for specific nonventilation functions, residential buildings, alterations and systems with ERV.

Table C402.1.3 (Proposed State Amendments). Two options are presented for this table. They differ only in the mass wall category. Option 1 uses the value from the 2015 IECC (and 2012 IECC) and deletes the footnote allowing uninsulated walls for some building types. Option 2 also deletes the footnote, but increases the R-value to that of the 2012 Seattle Energy Code. The other change, present in both options, is the additional column to the compliance option for continuous insulation fasteners, increasing the allowable penetrations to 0.12 percent.

Lighting Power Allowance (Proposed State Amendment). Both the building area method and space-by-space method were decreased by twenty percent over those proposed in the integrated draft.

A number of changes were made to update to new ASHRAE 90.1 requirements:

Efficiency tables C403.2.3 (1) through (10), C404.2, C405.8 (1) through (4).

C403.2.3.1, Water-cooled centrifugal chilling packages.

C403.2.3.2, Positive displacement (air- and water-cooled) chilling packages.

C403.2.4.1.3, Setpoint overlap restrictions.

C403.2.4.5, Zone isolation.

C403.2.4.6, Freeze protection systems.

C403.2.4.12, Direct digital control systems.

C403.2.7.1, Kitchen exhaust.

C403.2.11.5, Fan airflow control.

C403.4.1.1, Static pressure sensor location.

C403.4.1.2, Set points for DDC.

C403.4.2.5, Boiler turndown.

C403.4.4, Mechanical systems serving multiple zones.

C403.4.4.3, Multiple zone VAV control.

C404.7.3, Controls for hot water storage.

C405.6, Electrical transformers.

Several sections were moved to accommodate the reorganization (and thus shown as underlined text), but were not changed (or had very minor editorial changes):

Area weighted U-factors moved from C402.3.4 to C402.4.3.4.

Doors moved from C402.2.7 to C402.4.4.

Off hour controls moved from C403.2.4.3 to C403.2.4.2.

Group R-2/R-3 dwelling units moved from C403.2.4.8 to C403.2.4.10.

Group R-2 sleeping units moved from C403.2.4.9 to C403.2.4.11.

Occupancy sensors moved from C403.2.5.2 to C403.2.6.3.

Laboratory exhaust moved from C403.2.5.4.2 to C403.2.7.2.

Manual controls moved from C405.2.1 to C405.2.3.

Area controls moved from C405.2.5 to C405.2.8.

Many changes were minor editorial changes to correlate section references or minor language adjustments:

C101.1, C101.2, C101.3, C108, C402.1, C402.2, C402.2.6, C402.4.1.3, Table C402.4, C403.2.1, C403.2.2, C403.2.3.4, C403.2.4, C403.2.4.5, C405.1, C405.5, C409.1, C409.3.

For a more detailed description of all of the changes, please see SBCC's web site at https://fortress.wa.gov/ga/apps/SBCC/Page.aspx?cid=3119.

A more in-depth analysis can be found on our web site, www.sbcc.wa.gov, or by contacting the office (contact information is noted under the small business/cost-benefit analysis section).

Reasons Supporting Proposal: RCW 19.27.031 and 19.27.074.

Statutory Authority for Adoption: RCW 19.27A.020, 19.27A.025, 19.27A.045, 19.27A.160.

Statute Being Implemented: Chapters 19.27, 19.27A, and 34.05 RCW.

Rule is not necessitated by federal law, federal or state court decision.

Agency Comments or Recommendations, if any, as to Statutory Language, Implementation, Enforcement, and Fiscal Matters: SBCC is seeking comments on the issues proposed in the rules shown below.

Name of Proponent: SBCC, governmental.

Name of Agency Personnel Responsible for Drafting and Implementation: Krista Braaksma, 1500 Jefferson S.E., P.O. Box 41449, Olympia, WA, (360) 407-9278.

A small business economic impact statement has been prepared under chapter 19.85 RCW.

Small Business Economic Impact Statement

Description: SBCC is filing a proposed rule to adopt the updated 2015 edition of IECC with state amendments, known as the 2015 WSEC: Chapters 51-11R and 51-11C WAC. Since 1985 SBCC has been responsible to update new editions of the building code per RCW 19.27.074.

The administrative compliance requirements are under the authority of the local government. RCW 19.27.050. Enforcement activities including permit issuance, plan review and approval, and inspections occur at the local level. Requirements for construction document submittal and other reporting requirements are determined by the local jurisdiction and are consistent with previously established policies. The proposed amendments to chapter 51-51 WAC include specific technical requirements for building construction to be consistent with national standards.

WSEC is updated every three years by SBCC. The code development process conducted by the model code organization is open to all interest groups within the design and construction industry and from governmental organizations. See www.iccsafe.org for more information about the model code development process.

Professional Services: Washington has had a statewide building code in effect since 1974. The local enforcement authority having jurisdiction administers the codes through the building and/or fire departments. Administrative procedures for state building code compliance are established and will not be changed by the adoption of the update to the current building codes. Small businesses will employ the same types of professional services for the design and construction of buildings and systems to comply with the state building code.

The proposed rule updates the state building code and does not require additional equipment, supplies, labor or other services. Services needed to comply with the building code are existing within the construction industry as required by the local authority having jurisdiction.

Costs of Compliance for Businesses: SBCC accepts proposals to amend WSEC to meet the legislative goals. The statewide code amendment proposal process is defined in chapter 51-04 WAC and SBCC bylaws. Proposals must increase the energy efficiency in buildings. Each proponent must identify where a proposed amendment has an economic impact and must quantify costs. SBCC developed a specific set of forms for WSEC, so proponents could identify where a proposed amendment was editorial, technical or a policy change.

SBCC received one hundred fifty-four proposals to improve WSEC. The energy code technical advisory group (TAG) recommended approval of one hundred sixteen amendments as submitted or as modified. Of those, TAG identified twenty-one as editorial corrections, and eighty-seven as technical corrections. The remaining eight proposed amendments were identified by TAG as having a significant cost.

The energy code TAG and the SBCC economic workgroup determined there is a cost for compliance on businesses for the following proposed state amendments. SBCC recommended filing the proposed rule to allow input through the public hearing process. See the preliminary cost-benefit analysis of the 2015 WSEC for a detailed review of each of these amendments.


Proposal Number	Section/Subject	Economic Workgroup Comments
15-E009	R403.7.1 Ductless mini-split heat pumps	Look at costs outside of the Tacoma area. Note that there is a side benefit of cooling being provided without additional cost.
Link: https://fortress.wa.gov/ga/apps/SBCC/File.ashx?cid=4888
15-E012 (Mod 2)	R406.2 Additional Requirements	Look at analysis of Option 2 point requirements, small house requirement in particular.
Link: https://fortress.wa.gov/ga/apps/SBCC/File.ashx?cid=4892 Mod2: https://fortress.wa.gov/ga/apps/SBCC/File.ashx?cid=5534
15-E029 and E036	Table C402.1.1 Appendix A Mass Walls	Requesting more information on the analysis done by the minority report proponents.
Link E029: https://fortress.wa.gov/ga/apps/SBCC/File.ashx?cid=4939 Link E036: https://fortress.wa.gov/ga/apps/SBCC/File.ashx?cid=4941
15-E070	C403.2.6.1 Dedicated Outdoor Air Systems	Look at a model for east of the Cascades.
Link: https://fortress.wa.gov/ga/apps/SBCC/File.ashx?cid=4909
15-E098	C405.14 Controlled Receptacles
Link: https://fortress.wa.gov/ga/apps/SBCC/File.ashx?cid=4980
15-E114	C405.4.2 Lighting Power Allowance
Link: https://fortress.wa.gov/ga/apps/SBCC/File.ashx?cid=4992
15-E121	C406 Additional Requirements	Looking for more cost-benefit data from the proponents, example analyses.
Link: https://fortress.wa.gov/ga/apps/SBCC/File.ashx?cid=4997

Loss of Sales or Revenue: The proposed rules make the state code for building construction consistent with national standards. Businesses with new products or updated test or design standards are recognized in the updated building code. For these businesses there will be a gain in sales and revenue.

The results of reduced energy use in buildings include avoiding the need for new power generation, reducing environmental impact, and providing local employment. The legislative findings state that energy efficiency is the cheapest, quickest, and cleanest way to meet rising energy needs, confront climate change, and boost our economy.

Cost of Compliance for Small Businesses: The majority of businesses affected by the updates to the building codes are small businesses; over ninety-five percent of those listed in the construction and related industries have under fifty employees. The costs per employee are comparable between the largest businesses and the majority of small businesses. The cost to comply with the updated codes is not a disproportionate impact on small business. Where SBCC found the cost of compliance for small businesses to be disproportionate, the proposed rule mitigates the cost. The proposed rules include a definition of small business and provide exceptions for compliance with the updated rule.

Small Businesses Involved in the Development of the Rule: SBCC conducted open public meetings of the energy code TAG, available via telephone conference bridge and over the internet, and allowed comment on every item on every agenda. SBCC appointed over one hundred representatives of all segments of the business and construction community to serve on the TAGs.

List of Industries: Below is a list of industries required to comply with the energy code:


NAICS #	Type of Business	Businesses with fewer than 50 employees	Businesses with 50 or more employees
236115	New Single-Family Housing Construction	2523	18
236116	New Multifamily Housing Construction	69	4
236118	Residential Remodelers	4298	3
236210	Industrial Building Construction	88	8
236220	Commercial and Institutional Building Construction	1151	40
238120	Structural Steel and Precast Concrete Contractors	154	10
238130	Framing Contractors	1866	17
238140	Masonry Contractors	517	1
238150	Glass and Glazing Contractors	208	6
238190	Other Foundation, Structure, and Building Exterior Contractors	145	1
238220	Plumbing, Heating, and Air-Conditioning Contractors	2245	66
238290	Other Building Equipment Contractors	315	6
238310	Drywall and Insulation Contractors	898	18
321911	Wood Window and Door Manufacturing	31	1
327331	Concrete Block and Brick Manufacturing	13	1
332311	Prefabricated Metal Building and Component Manufacturing	16	4
332312	Fabricated Structural Metal Manufacturing	67	8
332321	Metal Window and Door Manufacturing	10	1
332322	Sheet Metal Work Manufacturing	69	8
333415	Air-Conditioning and Warm Air Heating Equipment	13	2
335110	Electric Lamp Bulb and Part Manufacturing	3
335121	Residential Electric Lighting Fixture Manufacturing	14
335122	Commercial, Industrial, and Institutional Electric Light	2	1
335129	Other Lighting Equipment Manufacturing	3	1
423320	Brick, Stone, and Related Construction Material Merchant	68	1
423330	Roofing, Siding, and Insulation Material Merchant Wholesale	33	4
423390	Other Construction Material Merchant Wholesalers	78
423720	Plumbing and Heating Equipment and Supplies (Hydronics)	99	6
423730	Warm Air Heating and Air-Conditioning Equipment and Supplies	48	1
531110	Lessors Of Residential Buildings and Dwellings	1525	152
531120	Lessors Of Nonresidential Buildings (Except Mini Warehouse)	2046	7
541310	Architectural Services	579	19
541330	Engineering Services	2351	82
541340	Drafting Services	69
541350	Building Inspection Services	168	1
922160	Fire Protection	246	31

Estimate of the Number of Jobs That Will Be Created or Lost: The adoption of the latest code edition is not expected to significantly impact the number of jobs in the construction industry. These rules are likely to be job neutral overall, i.e., they will not result in any job gains or losses. The scheduled effective date of the new edition is July 1, 2016. Building permits issued prior to that date will be vested under the 2012 building code. Permits issued for projects under the 2015 code edition will start with the 2017 construction season.

The construction industry has experienced growth over the period June 2014 to June 2015.

(Data from Current Employment Statistics (CES))


Wage and salary workers	2015	2014
Residential building construction	25,600	22,400
Nonresidential building construction	18,700	16,500
Specialty trade contractors	114,200	101,400

A copy of the statement may be obtained by contacting Tim Nogler, Washington SBCC, P.O. Box 41449, Olympia, WA 98504-1449, phone (360) 407-9280, fax (360) 586-9088, e-mail sbcc@ga.wa.gov.

A cost-benefit analysis is required under RCW 34.05.328. A preliminary cost-benefit analysis may be obtained by contacting Tim Nogler, Managing Director, Washington SBCC, P.O. Box 41449, Olympia, WA 98504-1449, phone (360) 407-9280, fax (360) 586-9088, e-mail sbcc@ga.wa.gov.

August 12, 2015

David F. Kokot

Council Chair

AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)

WAC 51-11C-10100 Section C101—Scope 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.

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.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

AMENDATORY SECTION (Amending WSR 14-24-122, filed 12/3/14, effective 1/3/15)

WAC 51-11C-10140 Section C101.4—Applicability.

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:

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)) WSEC—Commercial Provisions or ((IECC)) WSEC—Residential Provisions.

AMENDATORY SECTION (Amending WSR 13-20-120, filed 10/1/13, effective 11/1/13)

WAC 51-11C-10143 ((Table C101.4.3.2—Economizer 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 C101.5—Compliance.

C101.5 Compliance. Residential buildings shall meet the provisions of ((IECC)) WSEC—Residential Provisions. Commercial buildings shall meet the provisions of ((IECC)) WSEC—Commercial 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 C103—Construction 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 C104—Inspections.

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 C106—Referenced 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 C108—Stop 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.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

AMENDATORY SECTION (Amending WSR 13-04-056, filed 2/1/13, effective 7/1/13)

WAC 51-11C-20201 Section C202.1—A.

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 C202.2—B.

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 C202.3—C.

-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. 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 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.

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.

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 C202.4—D.

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 C202.6—F.

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), opaque doors, 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.

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.

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 C202.7—G.

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 C202.8—H.

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 C202.9—I.

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 C202.12—L.

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 C202.13—M.

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 C202.15—O.

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 C202.16—P.

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 C202.18—R.

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.

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 C202.19—S.

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.

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 C202.20—T.

((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 C202.21—U.

-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.

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 C202.22—V.

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.

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.

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 C202.23—W.

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 303.1—Identification.

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 C303.2—Installation.

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 C401—General.

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 ((93)) 87 percent of the standard reference design building.

((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 C402.1—General (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 C402.5.

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)) C402.1.3—Opaque 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.))

OPTION 1:

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-30ci	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-11.4ci	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 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 C402.1.4.
c	Reserved.
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 C402.1.2 for determination of U-factors for assemblies that include metal other than screws and nails.

OPTION 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-30ci	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-13.3ci	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 slabsd	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 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 C402.1.4.
c	Reserved.
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-11.4ci	R-14.3ci	R-13ci
R-13.3ci	R-16.6ci	R-15.7ci
R-15.2ci	R-19.0ci	R-18.3ci
R-30ci	R-38ci	R-21ci
R-38ci	R-48ci	R-42ci
R-13 + R-7.5ci	R-13 + R-9.4ci	R-53ci
R-13 + R-10ci	R-13 + R-12.5ci	R-13 + R-10.3ci
R-13 + R-12.5ci	R-13 + R-15.6ci	R-13 + R-13.8ci
R-13 + R-13ci	R-13 + R-16.3ci	R-13 + R-17.2ci
R-19 + R-8.5ci	R-19 + R-10.6ci	R-13 + R-17.9ci
R-19 + R-14ci	R-19 + R-17.5ci	R-19 + R-11.7ci
R-19 + R-16ci	R-19 + R-20ci	R-19 + R-19.2ci
R-20 + R-3.8ci	R-20 + R-4.8ci	R-19 + R-22ci
R-21 + R-5ci	R-21 + R-6.3ci	R-20 + R-5.3ci

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 0.0012 (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 C402.1.2 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 Handbook—Fundamentals 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 C402.1.4—Opaque thermal envelope requirements, U-factor method.

OPTION 1:

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-0.090	U-0.080
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 C402.1.2.
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	Reserved.
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.

OPTION 2:

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 and single rafter	U-0.027	U-0.027
Walls, Above Grade
Mass	U-0.078	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 C402.1.2.
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	Reserved.
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 C402.1.4.1—Effective 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
	3 1/2	16	15	0.43	6.45
	3 1/2	24	13	0.55	7.15
	3 1/2	24	15	0.52	7.80
	6	16	19	0.37	7.03
	6	16	21	0.35	7.35
	6	24	19	0.45	8.55
	6	24	21	0.43	9.03
	8	16	25	0.31	7.75
	8	24	25	0.38	9.50

NEW SECTION

WAC 51-11C-40215 Section C402.1.5—Component 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 Dif = UA Proposed – UA Table
	UA Proposed	=	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 Dif = FL Proposed – FL Table
	FL Proposed	=	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 Handbook—Fundamentals, using the framing factors listed in Appendix A.