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WACs > Title 51 > Chapter 51-11C > Section 51-11C-61015











51-11C-61014    

51-11C-61020







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WAC 51-11C-61015









Section A101.5—Building materials.










A101.5 Building materials. Default R-values used for building materials shall be as shown in Table A101.5. Table A101.5 Default R-values for Building Materials

Material Nominal Size (in.)
Actual
Size (in.)

R-Value
(Heat Capacityc)


Air cavity (unventilated), between metal studs at 16 inches on centera
- - 0.79

Air cavity (unventilated), all other depths and framing materials1 - - 0.91

Airfilm, exterior surfacesb - - 0.17

Airfilm, interior horizontal surfaces, heat flow upb
- - 0.61

Airfilm, interior horizontal surfaces, heat flow downb
- - 0.92

Airfilm, interior vertical surfacesb
- - 0.68

Brick at R-0.12/in. (face brick, 75% solid/25% core area, 130 lbs/ft3) 4 3.5 0.32 (5.9)

Carpet and rubber pad - - 1.23

Concrete at R-0.0625/in., heavyweight (144 lbs/ft3) - 2 0.13 (HC-4.8)

  - 4 0.25 (HC-9.6)

  - 6 0.38 (HC-14.4)

  - 8 0.50 (HC-19.2)

  - 10 0.63 (HC-24.0)

  - 12 0.75 (HC-28.8)

Concrete masonry units, solid grouted, lightweight (95 lbs/ft3) 6 - 0.80 (HC-11.4)

Concrete masonry units, solid grouted, normal weight (135 lbs/ft3) 6 - 0.51 (HC-13.2)

Concrete masonry units, partly grouted, lightweight (95 lbs/ft3) 6 - 1.33 (HC-6.7)

Concrete masonry units, partly grouted, normal weight (135 lbs/ft3) 6 - 0.82 (HC-9.0)

Concrete masonry units, solid grouted, lightweight (95 lbs/ft3) 8 - 1.05 (HC-15.5)

Concrete masonry units, solid grouted, normal weight (135 lbs/ft3) 8 - 0.69 (HC-17.9)

Concrete masonry units, partly grouted, lightweight (95 lbs/ft3) 8 - 1.44 (HC-9.6)

Concrete masonry units, partly grouted, normal weight (135 lbs/ft3) 8 - 0.98 (HC-12.0)

Concrete masonry units, solid grouted, lightweight (95 lbs/ft3) 10 - 1.30 (HC-19.7)

Concrete masonry units, solid grouted, normal weight (135 lbs/ft3) 10 - 0.87 (HC-22.6)

Concrete masonry units, partly grouted, lightweight (95 lbs/ft3) 10 - 1.61 (HC-11.9)

Concrete masonry units, partly grouted, normal weight (135 lbs/ft3) 10 - 1.11 (HC-14.8)

Concrete masonry units, solid grouted, lightweight (95 lbs/ft3) 12 - 1.53 (HC-23.9)

Concrete masonry units, solid grouted, normal weight (135 lbs/ft3) 12 - 1.06 (HC-27.2)

Concrete masonry units, partly grouted, lightweight (95 lbs/ft3) 12 - 1.75 (HC-14.2)

Concrete masonry units, partly grouted, normal weight (135 lbs/ft3) 12 - 1.23 (HC-17.5)

Flooring, wood subfloor - 0.75 0.94

Gypsum board - 0.5 0.45

  - 0.625 0.56

Metal deck - - 0

Roofing, built-up - 0.375 0.33

Sheathing, vegetable fiber board, 0.78 in. - 0.78 2.06

Soil at R-0.104/in. - 12 1.25

Steel, mild   1 0.0031807

Stucco - 0.75 0.08



a
There is no credit for cavities that are open to outside air.

b
Air films do not apply to air cavities within an assembly.

c
For heat capacity for concrete and concrete masonry materials with densities other than the values listed in Table A101.5, see Tables A3.1B and A3.1C in ASHRAE/IESNA Standard 90.1.

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61015, filed 2/1/13, effective 7/1/13.]