WAC 51-11-1006   Section 1006 Default U-factors for glazing and doors.  


     1006.1 Glazing and Doors without NFRC Certification: Glazing and doors that do not have NFRC certification shall be assigned the following U-factors:
TABLE 10-6

Other than Group R Occupancy: DEFAULT U-FACTORS FOR VERTICAL GLAZING, OVERHEAD GLAZING AND OPAQUE DOORS
Vertical Glazing
U-Factor
Any Frame Aluminum W/Thermal Break Vinyl/Wood

Frame
Single 1.45 1.45 1.45
Double 0.90 0.85 0.75
1/2 Inch Air, Fixed 0.75 0.70 0.60
1/2 Inch Air,

Low-e(0.40), Fixed		 0.60 0.55 0.50
1/2 Inch Air, Low-e(0.10), Fixed 0.55 0.50 0.45
1/2 Inch Argon,

Low-e(0.10), Fixed		 0.50 0.45 0.40

The category for aluminum frame with a thermal break is as defined in footnote 7 to Table 10-6A.




Overhead Glazing: Sloped Glazing (Including Frame)
U-Factor
Any Frame Aluminum W/Thermal Break Vinyl/Wood

Frame
Single 1.74 1.74 1.74
Double 1.08 1.02 0.90
1/2 Inch Air, Fixed 0.90 0.84 0.72
1/2 Inch Air, Low-e(0.40), Fixed 0.72 0.66 0.60
1/2 Inch Air, Low-e(0.10), Fixed 0.66 0.60 0.54
1/2 Inch Argon, Low-e(0.10), Fixed 0.60 0.54 0.48

     This default table is applicable to sloped glazing only. (Sloped glazing is a multiple-lite glazed system (similar to a curtain wall) that is mounted at a slope greater than 15° from the vertical plane.) Other overhead glazing shall use the defaults in Table 10-6E.



Opaque Doors
U-Factor
Uninsulated Metal 1.20
Insulated Metal (Including Fire Door and Smoke Vent) 0.60
Wood 0.50

Notes:


Where a gap width is listed (i.e.: 1/2 inch), that is the minimum allowed.

Where a low-emissivity emittance is listed (i.e.: 0.40, 0.20, 0.10), that is the maximum allowed.

Where a gas other than air is listed (i.e.: Argon), the gas fill shall be a minimum of 90%.

Where an operator type is listed (i.e.: Fixed), the default is only allowed for that operator type. Where a frame type is listed (i.e.: Wood/vinyl), the default is only allowed for that frame type. Wood/vinyl frame includes reinforced vinyl and aluminum-clad wood.


TABLE 10-6A

Group R Occupancy: DEFAULT U-FACTORS FOR VERTICAL GLAZING
Description1,2,3,4 Frame Type5,6
  Aluminum Aluminum

Thermal Break7		 Wood/Vinyl
Windows Single 1.20 1.20 1.20
  Double, < 1/2" Clear 0.92 0.75 0.63
  Clear + Argon 0.87 0.71 0.60
Low-e 0.85 0.69 0.58
Low-e + Argon 0.79 0.62 0.53
Double, > 1/2" Clear 0.86 0.69 0.58
  Clear + Argon 0.83 0.67 0.55
Low-e 0.78 0.61 0.51
Low-e + Argon 0.75 0.58 0.48
Triple, Clear 0.70 0.53 0.43
  Clear + Argon 0.69 0.52 0.41
Low-e 0.67 0.49 0.40
Low-e + Argon 0.63 0.47 0.37
Garden Single 2.60 n.a. 2.31
Windows Double Clear 1.81 n.a. 1.61
    Clear + Argon 1.76 n.a. 1.56
Low-e 1.73 n.a. 1.54
Low-e + Argon 1.64 n.a. 1.47


1 <1/2" = a minimum dead air space of less than 0.5 inches between the panes of glass.
  > 1/2" = a minimum dead air space of 0.5 inches or greater between the panes of glass.
  Where no gap width is listed, the minimum gap width is 1/4".
2 Any low-e (emissivity) coating (0.1, 0.2 or 0.4).
3 U-factors listed for argon shall consist of sealed, gas-filled insulated units for argon, C02, SF6, argon/SF6 mixtures and Krypton.
4 "Glass block” assemblies may use a U-factor of 0.51.
5 Insulated fiberglass framed products shall use wood/vinyl U-factors.
6 Aluminum clad wood windows shall use the U-factors listed for wood/vinyl windows.
7 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 produces 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.


TABLE 10-6B1

Group R Occupancy: SMALL BUSINESS COMPLIANCE TABLE FOR VERTICAL GLAZING


FRAME TYPE7,8
DESCRIPTION2,3,4,6 ALUMINUM ALUM.

THERMAL

BREAK9		 WOOD/VINYL ALUM. CLAD

WOOD/REINFORCED

VINYL10
Double, Clear 1/4" 0.82 0.66 0.56 0.59
Double, Clear 1/4" + argon 0.77 0.63 0.53 0.56
Double, Low-e4 1/4" 0.76 0.61 0.52 0.54
Double, Low-e2 1/4" 0.73 0.58 0.49 0.51
Double, Low-e1 1/4" 0.70 0.55 0.47 0.49
Double, Low-e4 1/4" + argon 0.70 0.55 0.47 0.49
Double, Low-e2 1/4" + argon 0.66 0.52 0.43 0.46
Double, Low-e1 1/4" + argon 0.64 0.50 0.41 0.43
Double, Clear 3/8" 0.78 0.63 0.54 0.57
Double, Clear 3/8" + argon 0.75 0.60 0.51 0.54
Double, Low-e4 3/8" 0.72 0.57 0.48 0.51
Double, Low-e2 3/8" 0.69 0.54 0.45 0.48
Double, Low-e1 3/8" 0.66 0.51 0.43 0.46
Double, Low-e4 3/8" + argon 0.68 0.53 0.44 0.47
Double, Low-e2 3/8" + argon 0.63 0.49 0.41 0.44
Double, Low-e1 3/8" + argon 0.61 0.47 0.35 0.41
Double, Clear 1/2" 0.75 0.60 0.50 0.54
Double, Clear 1/2" + argon 0.72 0.58 0.48 0.51
Double, Low-e4 1/2" 0.68 0.53 0.44 0.47
Double, Low-e2 1/2" 0.64 0.50 0.40 0.44
Double, Low-e1 1/2" 0.61 0.47 0.355 0.42
Double, Low-e4 1/2" + argon 0.65 0.50 0.42 0.44
Double, Low-e2 1/2" + argon 0.60 0.46 0.37 0.40
Double, Low-e1 1/2" + argon 0.58 0.43 0.34 0.38
Triple, Clear 1/4" 0.66 0.52 0.42 0.44
Triple, Clear 1/4" + argon 0.63 0.49 0.39 0.42
Triple, Low-e4 1/4" 0.64 0.50 0.40 0.40
Triple, Low-e2 1/4" 0.62 0.48 0.39 0.41
Triple, Low-e1 1/4" 0.61 0.47 0.38 0.40
Triple, Low-e4 1/4" + argon 0.60 0.46 0.37 0.39
Triple, Low-e2 1/4" + argon 0.58 0.43 0.34 0.37
Triple, Low-el 1/4" + argon 0.57 0.42 0.34 0.36
Triple, Clear 1/2" 0.61 0.46 0.37 0.40
Triple, Clear 1/2" + argon 0.59 0.45 0.36 0.38
Triple, Low-e4 1/2" 0.58 0.43 0.35 0.37
Triple, Low-e2 1/2" 0.55 0.41 0.32 0.35
Triple, Low-e1 1/2" 0.54 0.39 0.31 0.33
Triple, Low-e4 1/2" + argon 0.55 0.41 0.32 0.35
Triple, Low-e2 1/2" + argon 0.52 0.38 0.30 0.32
Triple, Low-e1 1/2" + argon 0.51 0.37 0.29 0.31
Footnotes to Table 10-6B
1 Subtract 0.02 from the listed default U-factor for nonaluminum spacer. Acceptable spacer materials may include but is not limited to fiberglass, wood and butyl or other material with an equivalent thermal performance.
2 1/4" = a minimum dead air space of 0.25 inches between the panes of glass.

3/8" = a minimum dead air space of 0.375 inches between the panes of glass.

1/2" = a minimum dead air space of 0.5 inches between the panes of glass.

Product with air spaces different than those listed above shall use the value for the next smaller air space; i.e. 3/4 inch = 1/2 inch U-factors, 7/16 inch = 3/8 inch U-factors, 5/16 inch = 1/4 inch U-factors.
3 Low-e4 (emissivity) shall be 0.4 or less.

Low-e2 (emissivity) shall be 0.2 or less.

Low-e1 (emissivity) shall be 0.1 or less.
4 U-factors listed for argon shall consist of sealed, gas-filled insulated units for argon, CO2, SF6, and argon/SF6 mixtures. The following conversion factor shall apply to Krypton gas-filled units: 1/4" or greater with krypton is equivalent to 1/2" argon.
5 For this assembly only, products shall be deemed to comply if they have an emissivity of 0.16 or less.
6 "Glass block” assemblies may use a U-factor of 0.51.
7 Insulated fiberglass framed products shall use wood/vinyl U-factors.
8 Subtract 0.02 from the listed default values for solariums.
9 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.
10 Aluminum clad wood windows shall use the U-factors listed for Aluminum Clad Wood/Reinforced Vinyl windows. Vinyl clad wood window shall use the U-factors listed for Wood/Vinyl windows. Any vinyl frame window with metal reinforcement in more than one rail shall use the U-factors listed for Aluminum Clad Wood/Reinforced Vinyl window.

TABLE 10-6C

Group R Occupancy: DEFAULT U-FACTORS FOR DOORS

Door Type No

Glazing		 Single

Glazing		 Double

Glazing

with 1/4 in.

Airspace		 Double

Glazing

with 1/2

in.

Airspace		 Double

Glazing

with

e = 0.10,

1/2 in.

Argon
SWINGING DOORS (Rough opening - 38 in. x 82 in.)
Slab Doors          
Wood slab in wood framea 0.46        
6% glazing (22 in. x 8 in. lite) - 0.48 0.47 0.46 0.44
25% glazing (22 in. x 36 in. lite) - 0.58 0.48 0.46 0.42
45% glazing (22 in. x 64 in. lite) - 0.69 0.49 0.46 0.39
More than 50% glazing   Use Table 10-6A  
Insulated steel slab with wood edge in wood framea 0.16        
6% glazing (22 in. x 8 in. lite) - 0.21 0.20 0.19 0.18
25% glazing (22 in. x 36 in. lite) - 0.39 0.28 0.26 0.23
45% glazing (22 in. x 64 in. lite) - 0.58 0.38 0.35 0.26
More than 50% glazing   Use Table 10-6A  
Foam insulated steel slab with metal edge in steel frameb 0.37        
6% glazing (22 in. x 8 in. lite) - 0.44 0.42 0.41 0.39
25% glazing (22 in. x 36 in. lite) - 0.55 0.50 0.48 0.44
45% glazing (22 in. x 64 in. lite) - 0.71 0.59 0.56 0.48
More than 50% glazing   Use Table 10-6A  
Cardboard honeycomb slab with metal edge in steel frameb 0.61        
Style and Rail Doors          
Sliding glass doors/French doors   Use Table 10-6A  
Site-Assembled Style and Rail Doors          
Aluminum in aluminum frame - 1.32 0.99 0.93 0.79
Aluminum in aluminum frame with thermal break - 1.13 0.80 0.74 0.63
REVOLVING DOORS (Rough opening - 82 in. x 84 in.)
Aluminum in aluminum frame          
Open - 1.32 - - -
Closed - 0.65 - - -
SECTIONAL OVERHEAD DOORS (Nominal - 10 ft x 10 ft)
Uninsulated steel (nominal U = 1.15)c 1.15 - - - -
Insulated steel (nominal U = 0.11)c 0.24 - - - -
Insulated steel with thermal break (nominal U = 0.08)c 0.13 - - - -


a. Thermally broken sill (add 0.03 for nonthermally broken sill)
b. Nonthermally broken sill
c. Nominal U-factors are through the center of the insulated panel before consideration of thermal bridges around the edges of the door sections and due to the frame.



TABLE 10-6D

Group R Occupancy: DEFAULT U-FACTORS FOR GLAZED DOORS

See Table 10-6C



TABLE 10-6E

Group R Occupancy: DEFAULT U-FACTORS FOR OVERHEAD GLAZING
  Frame Type
  Aluminum Aluminum Reinforced Wood or Vinyl-
  without with Vinyl/ Clad Wood/
  Thermal Thermal Aluminum-Clad Vinyl without
Glazing Type Break Break Wood or Vinyl Reinforcing
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 2x

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% argon or krypton.
4. Aluminum frame with thermal break is as defined in footnote 9 to Table 10-6B.




[Statutory Authority: RCW 19.27A.022, 19.27A.025, 19.27A.045, and chapters 19.27 and 34.05 RCW. 07-01-089, § 51-11-1006, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapters 19.27, 19.27A, and 34.05 RCW. 05-01-013, § 51-11-1006, filed 12/2/04, effective 7/1/05. Statutory Authority: RCW 19.27A.025, 19.27A.045. 02-01-112, § 51-11-1006, filed 12/18/01, effective 7/1/02; 01-03-010, § 51-11-1006, filed 1/5/01, effective 7/1/01; 98-03-003, § 51-11-1006, filed 1/8/98, effective 7/1/98. Statutory Authority: Chapters 19.27, 19.27A and 34.05 RCW. 94-05-059, § 51-11-1006, filed 2/10/94, effective 4/1/94. Statutory Authority: RCW 19.27A.020 and 1990 c 2. 91-01-112, § 51-11-1006, filed 12/19/90, effective 7/1/91.]