MIL-HDBK-1003/19
TABLE III.
R-Factors of building materials.
(Cont.)
R-Value
Density
Material and Description
per inch for listed
(lb/ft3) thickness thickness
Expanded polystyrene molded beads
75deg.F
1.0
3.57
--
30deg.F
3.85
--
Mineral fiberboard
Core or roof insulation
16-17
2.94
--
Acoustical tile
21
2.70
--
Mineral fiberboard, molded acoustical
tile
23
2.38
--
Wood or cane fiberboard
acoustical tile
1/2-inch
--
--
1.19
interior finish
15
2.86
--
insulating roof deck
1-inch
--
--
2.78
2-inch
--
--
5.56
3-inch
--
--
8.33
Shredded wood (cemented, preformed slabs)
22
1.67
--
Loose fills:
Macerated paper or pulp
2.5-3.5
3.57
--
Mineral wool
90deg.F 2.0-5.0
3.33
--
30deg.F
4.10
--
Perlite (expanded)
90deg.F 5.0-8.0
2.63
--
30deg.F
2.74
--
Vermiculite (expanded)
90deg.F 7.0-8.2
2.08
--
30deg.F
2.27
--
Sawdust or shavings
8.0-15
2.22
--
Masonry materials, concretes
Cement mortar
116
0.20
--
Gypsum-fiber concrete (87.5 percent
gypsum, 12.5 percent concrete)
51
0.60
--
Lightweight aggregates
120
0.19
--
(expanded shale, clay or slate;
100
0.28
--
expanded slags, or cinders;
80
0.40
--
pumice; perlite or vermiculite;
60
0.59
--
cellular concretes)
40
0.86
--
20
1.43
--
Sand and gravel or stone aggregate
(oven-dried)
140
0.11
--
Sand and gravel or stone aggregate
(not-dried)
140
0.08
--
Stucco
116
0.20
--
Masonry units
Brick, common (typical value)
120
0.20
--
Brick, face (typical value)
130
0.11
--
Clay tile, hollow
1 cell deep
3-inch
--
--
0.80
1 cell deep
4-inch
--
--
1.11
2 cells deep
6-inch
--
--
1.52
2 cells deep
8-inch
--
--
1.85
3 cells deep
10-inch
--
--
2.22
3 cells deep
12-inch
--
--
2.50
55
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