PDFWAC 51-11R-40520

Section R405.2—Performance based compliance.

R405.2 Performance based compliance. Compliance based on total building performance requires that a proposed design meet all of the following:
1. The requirements of the sections indicated within Table R405.2.
2. For structures less than 1,500 square feet of conditioned floor area, the annual site energy consumption shall be less than or equal to 64 percent of the annual site energy consumption of the standard reference design.
3. For structures 1,500 to 5,000 square feet of conditioned floor area, the annual site energy consumption shall be no more than 47 percent of the standard reference design.
4. For structures over 5,000 square feet of conditioned floor area, the annual site energy consumption shall be no more than 41 percent of the standard reference design.
5. For structures serving Group R-2 occupancies, the annual site energy consumption shall be less than or equal to 61 percent of the annual site energy consumption of the standard reference design. See Section R401.1 and residential building in Section R202 for Group R-2 scope.
Energy use derived from simulation analysis shall be expressed in Btu per square foot of conditioned floor area per year.
TABLE R405.2
MANDATORY COMPLIANCE MEASURES FOR TOTAL BUILDING PERFORMANCE
Sectiona
Title
Comments
General
R401.3
Certificate
 
Envelope
R402.1.1
Vapor retarder
 
R402.2.3
Eave baffle
 
R402.2.4.1
Access hatches and doors
 
R402.4
Air leakage
 
R402.5
Maximum fenestration
U-factor
 
Systems
R403.1
Controls
 
R403.3
Ducts
Except for R403.3.2 and R403.3.3
R403.4
Mechanical system piping insulation
 
R403.5.1
Heated water circulation and temperature maintenance system
 
R403.5.3
Drain water heat recovery units
 
R403.6
Mechanical ventilation
 
R403.7
Equipment sizing and efficiency rating
 
R403.8
Systems serving multiple dwelling units
 
R403.9
Snow melt system controls
 
R403.10
Energy consumption of pools and spas
 
R403.11
Portable spas
 
R403.12
Residential pools and permanent residential spas
 
Electrical Power and Lighting
R404.1
Lighting equipment
 
R404.2
Interior lighting controls
 
a
Reference to a code section includes all the relative subsections except as indicated in the table.
[Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40520, filed 1/16/24, effective 3/15/24; WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40520, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 22-10-094, § 51-11R-40520, filed 5/3/22, effective 6/3/22. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40520, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40520, filed 2/1/13, effective 7/1/13.]