Wash. Admin. Code § 51-11C-303134

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

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).

Wash. Admin. Code § 51-11C-303134

Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. 13-04-056, § 51-11C-303134, filed 2/1/13, effective 7/1/13.