Closed Cell Spray Foam R Value Per Inch

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.

Closed cell spray foam r value per inch. 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. 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. Closed cell spray foam is the most expensive residential insulation available. 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.

Most spray polyurethane foam is called two component foam. Closed cell spray foam provides a higher r value per inch 6 5 than less expensive insulation types like cellulose and fiberglass 3 5 to 3 7. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts.

It has a lower r value per inch than closed cell foam and is vapor permeable. Open cell spray foam has an r value of about r 3 7 per inch while closed cell spray foam has an r value that may be as high as r 6 5 per inch. Closed cell spray foams provide a higher r value per inch than less expensive insulation types like fiberglass cellulose or open cell foam all of which have r values of r 3 2 to r 3 8 per in. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.

Closed cell spray foams are between 2 and 4 lbs. Closed cell spray foam insulation. Two inches of closed cell foam will provide r12 r14 of insulation.