Wash. Admin. Code § 51-11R-40211 - Table R40212-Insulation and fenestration requirements by component

TABLE R402.1.2 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT^a

CLIMATE ZONE 5 AND MARINE 4
Fenestration U-factorb	0.30
Skylight U-factor	0.50
Ceiling U-factor	0.024
Above-Grade Wall U-factor	0.056
Floor U-factor	0.029
Slab on Grade F-factor	0.54
Below Grade 2' Depth
Wall U-factor	0.042
Slab F-factor	0.59
Below Grade 3.5' Depth
Wall U-factor	0.040
Slab F-factor	0.56
Below Grade 7' Depth
Wall U-factor	0.035
Slab F-factor	0.50

^a U-factors or F factors shall be obtained from measurement, calculation, or an approved source or as specified in Section R402.1.5.

^b A maximumU -factor of 0.32 shall apply to vertical fenestration products installed in buildings located above 4000 feet in elevation above sea level, or in windborne debris regions where protection of openings is required under Section R301.2.1.2 of the International Residential Code.

Notes

Wash. Admin. Code § 51-11R-40211

Amended by WSR 16-02-127, Filed 1/6/2016, effective 7/1/2016 Amended by WSR 17-10-063, Filed 5/2/2017, effective 6/2/2017 Amended by WSR 20-01-047, Filed 12/9/2019, effective 7/1/2020 Amended by WSR 23-02-060, Filed 1/3/2023, effective 7/1/2023

Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-121, § 51-11R-40211, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40211, filed 2/1/13, effective 7/1/13. WSR 13-20-001, § 51-11R-40211, filed 9/18/2013, effective 10/19/2013