WAC 51-11C-303134. Table C303.1.3(4) — Default U -factors for skylights

Table C303.1.3(4) Default U -Factors for Skylights Frame Type 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 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 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 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 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 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 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 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 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 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 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 Frame Type 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 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 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 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 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 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 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 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 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 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 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 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 percent argon or krypton. 4 Aluminum frame with thermal break is as defined in footnote 1 to Table C303.1.3(5).