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Download: Roof Deck Insulation Compression Strengths (pdf file)
Insulation
Type |
Unit Weight |
Compressive
Strength |
| Expanded
Polystyrene |
1.0 pcf |
10 to 14 psi |
| 1.25 pcf |
13 to 18 psi |
| 1.5 pcf |
15 to 21 psi |
| 2.0 pcf |
25 to 33psi |
| Extruded Polystyrene |
1.3 to 4.1
pcf |
12 to 60 psi |
| Glass Fiber/Mineral |
10 to 15 pcf |
10 psi |
| Cellular Glass |
8.5 pcf |
100 psi |
| Fiberboard |
----- |
12 to 18 psi |
| Perlite |
10 to 10 pcf |
35 to 40 psi |
| Polyisocyanurate |
----- |
10 to 25 psi |
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