R-Values of Common Building Materials


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