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WACs > Title 51 > Chapter 51-11R > Section 51-11R-30314
51-11R-30313
51-11R-30315
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WAC 51-11R-30314
Table R303.1.3(4)âDefault U-factors for skylights.
TABLE R303.1.3(4) DEFAULT U-FACTORS FOR SKYLIGHTS
 Frame Type
Â
Aluminum Without
Thermal Break
Aluminum With
Thermal Break
Reinforced Vinyl/Aluminum-Clad Wood or Vinyl Wood or Vinyl-Clad Wood/Vinyl Without Reinforcing
Fenestration Type
Single Glazing    Â
 glass U-1.58 U-1.51 U-1.40 U-1.18
 acrylic/polycarb U-1.52 U-1.45 U-1.34 U-1.11
Double Glazing    Â
air U-1.05 U-0.89 U-0.84 U-0.67
argon U-1.02 U-0.86 U-0.80 U-0.64
Double Glazing, e = 0.20    Â
air U-0.96 U-0.80 U-0.75 U-0.59
argon U-0.91 U-0.75 U-0.70 U-0.54
Double Glazing, e = 0.10    Â
air U-0.94 U-0.79 U-0.74 U-0.58
argon U-0.89 U-0.73 U-0.68 U-0.52
Double Glazing, e = 0.05    Â
air U-0.93 U-0.78 U-0.73 U-0.56
argon U-0.87 U-0.71 U-0.66 U-0.50
Triple Glazing    Â
air U-0.90 U-0.70 U-0.67 U-0.51
argon U-0.87 U-0.69 U-0.64 U-0.48
Triple Glazing, e = 0.20    Â
air U-0.86 U-0.68 U-0.63 U-0.47
argon U-0.82 U-0.63 U-0.59 U-0.43
Triple Glazing, e = 0.20 on 2 surfaces    Â
air U-0.82 U-0.64 U-0.60 U-0.44
argon U-0.79 U-0.60 U-0.56 U-0.40
Triple Glazing, e  =  0.10 on 2 surfaces    Â
air U-0.81 U-0.62 U-0.58 U-0.42
argon U-0.77 U-0.58 U-0.54 U-0.38
Quadruple Glazing, e = 0.10 on 2 surfaces    Â
air U-0.78 U-0.59 U-0.55 U-0.39
argon U-0.74 U-0.56 U-0.52 U-0.36
 krypton U-0.70 U-0.52 U-0.48 U-0.32
Notes for Table R303.1.3(4)
1.
U-factors are applicable to both glass and plastic, flat and domed units, all spacers and gaps.
2.
Emissivities shall be less than or equal to the value specified.
3.
Gap fill shall be assumed to be air unless there is a minimum of 90% argon or krypton.
4.
Aluminum frame with thermal break is as defined in footnote 1 to Table R303.1.3(1).
[Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30314, filed 2/1/13, effective 7/1/13.]
