Open Cell Spray Foam R Value Per Inch

R values are additive so you can multiple the number of inches of insulation thickness times the r value to arrive at a total insulation value.

Open cell spray foam r value per inch.

Open cell spray foams are between 5 and 1 lbs per cubic foot and have an r value of 3 0 4 0 per inch of insulation. 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 foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. Comparing fiberglass to foam fiberglass is the less expensive choice for wall insulation and is the spray foam insulation rental industrial spray foam insulation jun 12 2017.

Open cell spray foam r values. It performs much better than any form of batt for stopping air flow but it is not as complete of an air seal as closed cell spray foam. 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.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. 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. Open cell foam insulation values r3 r4. Open cell spray foam typically has an r value of 3 5 per inch and it should be noted that open cell does not form a tight air seal.

Closed cell foam r values spray with an r value of 3 5 per inch per inch of thickness.