MIL-HDBK-1003/19
TABLE III.
R-Factors of building materials.
R-Value
Density
Material and Description
per inch for listed
(lb/ft3) thickness thickness
Building boards, panels, flooring
Asbestos cement board
120
0.25
--
Asbestos cement board
1/8-inch
120
--
0.03
Gypsum or plaster board
3/8-inch
50
--
0.32
Gypsum or plaster board
1/2-inch
50
--
0.45
Plywood (see Siding materials)
34
1.25
--
Sheating, wood fiber
(impregnated or coated)
25/32-inch
20
--
2.06
Wood fiber board (laminated or homogenous)
26
2.38
--
Wood fiber, hardboard type
65
0.72
--
Wood fiber, hardboard type
1/4-inch
65
--
0.18
Wood subfloor
25/32-inch
--
--
0.98
Wood hardwood finish
3/4-inch
--
--
0.68
Building paper
Vapor-permeable felt
--
--
0.06
Vapor-seal, 2 layers of mopped 15 lb felt
--
--
0.12
Vapor-seal plastic film
--
--
negl.
Finish materials
Carpet and fibrous pad
--
--
2.08
Carpet and rubber pad
--
--
1.23
Cork tile
1/8-inch
--
--
0.28
Terrazzo
1-inch
--
--
0.08
Tile (asphalt, linoleum, vinyl, rubber)
--
--
0.05
Gypsum board
1/2-inch
--
--
0.45
Gypsum board
5/8-inch
--
--
0.56
Hardwood flooring
25/32-inch
--
--
0.68
Insulating materials
Blankets and batts:
Mineral wool, fibrous form (from rock,
0.5
3.12
--
slag, or glass)
1.5-4.0
3.12
--
Wood fiber
3.2-3.6
4.00
--
Boards and slabs:
Cellular glass
30deg.F
9
2.70
--
Cork board
30deg.F 6.5-8.0
3.85
--
30deg.F
12
3.45
--
Glass fiber
90deg.F 4.0-9.0
3.85
--
30deg.F
4.55
--
Expanded rubber (rigid)
75deg.F
4.5
4.55
--
Expanded polyurethane (R-11 blown;
1-inch thickness or more)
100deg.F 1.5-2.5
5.56
--
25deg.F
5.88
--
Expanded polystyrene, extruded
75deg.F
1.9
3.85
--
30deg.F
4.17
--
54
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