Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11C - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Commercial › Section 51-11C-61015 - Section A101.5-Building materials

Current through Register Vol. 24-14, July 15, 2024
A1015 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
Concretec 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 A103.3.7.1(1) through (3) or 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. 13-04-056, §
				  51-11C-61015, filed 2/1/13, effective
				  7/1/13.