Closed Cell Spray Foam Insulation R Value Per Inch

Most spray polyurethane foam is called two component foam.

Closed cell spray foam insulation r value per inch. The r value of closed cell foam is r 6 5 7 per inch. With foamed in place insulation it is relatively easy though not inexpensive to fill wall and ceiling cavities completely. Just like for open cell foam r values are additive. Spray foam insulation vs fiberglass r value is about equal for open cell insulation and about double for closed cell insulation per one inch layer.

They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. Two inches of closed cell foam will provide r12 r14 of insulation. If space is tight and you can only install a thin layer of insulation closed cell foam is by far the better choice. Closed cell spray foams are between 2 and 4 lbs.

Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. That means if you used foam it green closed cell which is r 7 per inch it s r value for a 3 5 deep wall cavity would be r 24 5. All these have r values ranging from r 3 2 to r 3 8 per inch. Closed cell spray foam insulation.

If you want to install spray foam in a stud wall and price is no object then it would seem to make sense to specify closed cell spray foam right.