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PDFWAC 51-11C-303135

Table C303.1.3(5)Small business compliance default table.

Table C303.1.3(5)
Small Business Compliance Table
Default U-Factors for Vertical Glazing
Vertical Glazing Description
Frame Type
Any Frame
Aluminum Thermal Break2
Wood/Vinyl/
Fiberglass
Panes
Low-e1
Spacer
Fill
Double3
A
Any
Argon
0.48
0.41
0.32
 
B
Any
Argon
0.46
0.39
0.30
 
C
Any
Argon
0.44
0.37
0.28
 
C
High
Performance
Argon
0.42
0.35
Deemed to
comply5
Triple4
A
Any
Air
0.50
0.44
0.26
 
B
Any
Air
0.45
0.39
0.22
 
C
Any
Air
0.41
0.34
0.20
 
Any double low-e
Any
Air
0.35
0.32
0.18
1
Low-eA (emissivity) shall be 0.24 to 0.16.
 
Low-eB (emissivity) shall be 0.15 to 0.08.
 
Low-eC (emissivity) shall be 0.07 or less.
2
Aluminum Thermal Break = An aluminum thermal break framed window shall incorporate the following minimum design characteristics:
a)
The thermal conductivity of the thermal break material shall be not more than 3.6 Btu-in/h/ft2/°F;
b)
The thermal break material must produce a gap in the frame material of not less than 0.210 inches; and
c)
All metal framing members of the products exposed to interior and exterior air shall incorporate a thermal break meeting the criteria in a) and b) above.
3
A minimum air space of 0.375 inches between panes of glass is required for double glazing.
4
A minimum air space of 0.25 inches between panes of glass is required for triple glazing.
5
Deemed to comply glazing shall not be used for performance compliance.
[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303135, filed 2/1/13, effective 7/1/13.]
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