Wash. Admin. Code § 51-11R-40520

Current through Register Vol. 24-21, November 1, 2024

Section 51-11R-40520 - Section R405.2-Performance based compliance

R405.2Performance 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.

Wash. Admin. Code § 51-11R-40520

Amended by WSR 20-01-047, Filed 12/9/2019, effective 7/1/2020

Amended by WSR 22-10-094, Filed 5/3/2022, effective 6/3/2022

Amended by WSR 23-02-060, Filed 1/3/2023, effective 7/1/2023

Amended by WSR 24-03-084, Filed 1/16/2024, effective 3/15/2024

Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. 13-04-055, § 51-11R-40520, filed 2/1/13, effective 7/1/13.