| INSULATION TYPE
|
UNIT WEIGHT |
COMPRESSIVE STRENGTH |
Expanded Polystyrene
Extruded Polystyrene
Glass Fiber/Mineral Fiber pcf
Cellular Glass
Fiberboard
Perlite
Polyisocyanurate |
1.0 pcf
1.25 pcf
1.5 pcf
2.0 pcf
1.3 to 4.1 pcf
10 to 15 pcf
8.5 pcf
—
10 to 13 pcf
— |
10 to 14 psi
13 to 18 psi
15 to 21 psi
25 to 33 psi
12 to 60 psi
10 psi
100 psi
12 to 18 psi
35 to 40 psi
10 to 25 psi |
Source: National Roofing Contractors Association, Commercial-Low
Slope
Roofing Materials Guide, 1994 Edition
psi: pounds per square inch
pcf: pounds per cubic foot
