Wash. Admin. Code § 51-11R-30311

Current through Register Vol. 25-01, January 1, 2025

Section 51-11R-30311 - Table R303.1. 3(1)-Default glazed fenestration U-factor

TABLE R303.1. 3(1)

DEFAULT GLAZED WINDOW, GLASS DOOR AND SKYLIGHT U- FACTOR

FRAME TYPE	SINGLE PANE	DOUBLE PANE	SKYLIGHT See Table R303.1. 3(4)
Metal	1. 20	0.80
Metal with Thermal Break^a	1. 10	0.65
Nonmetal or Metal Clad	0.95	0.55
Glazed Block	0.60

^a Metal Thermal Break = A metal thermal break framed window shall incorporate the following minimum design characteristics:

1 The thermal conductivity of the thermal break material shall be not more than 3.6 Btu-in/h/ft²/°F;

2 The thermal break material must produce a gap in the frame material of not less than 0.210 inches; and

3 All metal framing members of the products exposed to interior and exterior air shall incorporate a thermal break meeting the criteria in 1) and 2) above.

Wash. Admin. Code § 51-11R-30311

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

Amended by WSR 20-21-081, Filed 10/19/2020, effective 2/1/2021

Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. 13-04-055, § 51-11R-30311, filed 2/1/13, effective 7/1/13.