R-Values
Typical Material R-Values
| Material | R/Inch | R/Thickness |
|---|---|---|
| Fiberglass Batt | 3.14 | |
| attic | 2.2 | |
| wall | 3.2 | |
| Rock Wool Batt | ||
| attic | 3.1 | |
| wall | 3.03 | |
| Cellulose Blown-In | ||
| attic | 3.13 | |
| wall | 3.7 | |
| Vermiculite | 2.13 | |
| Autoclaved Aerated Concrete | 3.9 | |
| Urea Terpolymer Foam | 4.48 | |
| Rigid Fiberglass (> 4 lb/ft) | 4 | |
| Expanded Polystyrene (beadboard) | 4 | |
| Extruded Polystyrene | 5 | |
| Polyurethane (foamed-in-place) | 6.25 | |
| Polyisocyanurate (foil-faced) | 7.2 | |
| Polyisocyanurate (Roof Insulation) | ||
| 1" | 5.6 | 5.6 |
| 2" | 5.6 | 11.2 |
| 3" | 5.6 | 16.8 |
| 4" | 5.6 | 22.4 |