The simple and nominal R-values of common building materials are listed below:
Masonry/Stone/Brick | .80 per inch |
Wood | .90-1.3 per inch |
Concrete Masonry Unit (CMU) 8” | 1.11 per inch |
Drywall | .90 per inch |
Fiberglass Batt | 3.20 per inch |
Blown Cellulose | 3.60 per inch |
Polystryrene (EPS) | 5.00 per inch |
Polystyrene (XPS) | 6.00 per inch |
Polyisocyanurate Foil faced (polyiso) | 7.20 per inch |
Spray polyurethane foam (closed cell) | 6.50 per inch |
Spray polyurethane foam (open cell) | 3.60 per inch |
Air film (exterior) | .17 per inch |
Air film (interior) | .68 per inch |
Air space from ½” to 4” | 1.00 per inch |
Plywood sheathing | 1.25 per inch |
Aluminum/Vinyl siding (uninsulated) | .61 per inch |
Aluminum/Vinyl siding (1/2” insulation) | 1.80 per inch |