Closed Cell Spray Insulation 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 insulation 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. With foamed in place insulation it is relatively easy though not inexpensive to fill wall and ceiling cavities completely. Closed cell spray foams are between 2 and 4 lbs. Contractors often use it to insulate under slabs ceilings walls and roofs.

They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. 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. 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.

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used than batts. Installing quality insulation is the best thing you can do to improve the energy e closed cell foam r values spray with an r value of 3 5 per inch per inch of thickness. 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.

Just like for open cell foam r values are additive. The r value of closed cell foam is r 6 5 7 per inch.