Thermal Properties of Materials Machinery's Handbook, 31st Edition
371
Table 7. Values of Thermal Conductivity ( k ) and of Conductance ( C ) of Common Building and Insulating Materials Type of Material Thick ness, in. k or C a Type of Material Thick ness, in. k or C a Max. Temp., ° F Density, lb per cu. ft.
k a
BUILDING
BUILDING ( Continued )
Batt:
… … Siding:
… … … … … 1.61 … … … Avg. … … … … … 1 12.50 … … … … … … … … 7 ⁄ 16 1.49 … … … 8 0.54 … … … 12 0.40 … … … 4 0.9 … … …
Mineral Fiber Mineral Fiber Mineral Fiber Mineral Fiber Mineral Fiber
0.14 Metal b
2–2 3 ⁄ 4 3–3 1 ⁄ 2
0.09 Wood, Med. Density
3 1 ⁄ 2 –6 1 ⁄ 2 0.05 Stone: 6–7 0.04 Lime or Sand
0.03 Wall Tile:
8 1 ⁄ 2
Block:
… … Hollow Clay, 1-Cell 4 0.90 Hollow Clay, 2-Cell 8 0.58 Hollow Clay, 3-Cell
Cinder Cinder Cinder
12 0.53 … …
Hollow Gypsum
Avg.
0.7
… … …
Block:
INSULATING
Concrete Concrete Concrete
4 1.40 Blanket, Mineral Fiber: 80.90 Felt 12 0.78 Rock or Slag
… … … … …
… … 400
3 to 8 0.26
… … 1200 6 to 12 0.26 c
Board:
… …
Glass
… … 350 … … 350 … … 180
0.65 0.33 0.65 0.31
Asbestos Cement
16.5 Textile
1 ⁄ 4 1 ⁄ 2 3 ⁄ 4
Plaster
2.22 Blanket, Hairfelt 1.07 Board, Block and Pipe
10
0.29
Plywood
… … … … … … … … … … … … 1500 15 to 18 0.32 c
Brick:
… … Insulation: 15.0 Amosite 1 9.0 Asbestos Paper
Common
Face
… … 700 … … 350
30
0.40 c
Concrete (poured)
1 12.0 … …
Glass or Slag (for Pipe) Glass or Slag (for Pipe)
3 to 4 0.23
… … 1000 10 to 15 0.33 c
Floor:
Wood Subfloor Hardwood Finish
1.06
Glass, Cellular
… … 800
9
0.40
3 ⁄ 4 3 ⁄ 4
1.47 Magnesia (85%)
… … 600 11 to 12 0.35 c
Tile
Avg. 20.0 Mineral Fiber … … Polystyrene, Beaded … 10.00 Polystyrene, Rigid
… … 100 … … 170 … … 170
15
0.29 0.28
Glass:
1
Architectural
1.8 0.25 4.5 0.22
Mortar:
… … Rubber, Rigid Foam … … 150
Cement
1 5.0 Wood Felt … … Loose Fill:
… … 180
20
0.31
Plaster:
… … … … … … … … 2.5 to 3 0.27 … … … 2to5 0.28 … … … 5to8 0.37 … … … 7.6 0.17 … … … 7 to 8.2 0.47 … … … … … … … 1800 24 to 30 0.49 c
Sand
13.30 Cellulose 11.10 Mineral Fiber
3 ⁄ 8 1 ⁄ 2
Sand and Gypsum
Stucco Roofing:
15.0 Perlite … … Silica Aerogel
Asphalt Roll Shingle, asb. cem. Shingle, asphalt Shingle, wood
Avg. Avg. Avg. Avg.
6.50 Vermiculite 4.76 Mineral Fiber Cement: 2.27 Clay Binder 1.06 Hydraulic Binder
… … 1200 30 to 40 0.75 c a Units are in Btu/hr-ft 2 -°F. Where thickness is given as 1 inch, the value given is thermal conductivity (k); for other thicknesses the value given is thermal conductance ( C ). All values are for a test mean temperature of 75°F, except those designated with c , which are for 100°F. b Over hollowback sheathing. c Test mean temperature 100°F, see footnote a . Source: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.: Handbook of Fundamentals.
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