Open Cell Polyurethane Foam R Value

Two inches of closed cell foam will provide r12 r14 of insulation. Just like for open cell foam r values are additive. Polyurethane and polyisocyanurate are both closed cell foams.

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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.

Open cell polyurethane foam r value.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. 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. 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. By expanding 100 times its original size icynene seals cracks and gaps in attics walls ceilings and other spaces where air might escape.

Closed cell spray foams are between 2 and 4 lbs. Open cell spray foam r values. Closed cell spray foam insulation 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. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts.

They contain low conductivity gases in the cells usually one of the hcfc or cfc gases the higher r values r 7 0 to 8 0 are the result of thermal resistance of the gases in the cells. 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. Icynene sprayed in foam is an insulation and air seal system that works to help ensure that your home doesn t suffer from air loss while providing an effective r value.

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