Closed Cell Spray Foam Insulation R Value

Open cell spray foam r values.

Closed cell spray foam insulation r value. 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. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. Just like for open cell foam r values are additive. Both closed cell spray foam and open cell spray foam insulation can be used effectively in commercial building designs to allow the building to achieve energy efficiency and consistent performance.

Closed cell spray foam insulation. 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. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. 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 r6 r8. Since closed cell foam has a higher r value per inch installers generally spray 2 in walls and 3 in rooflines to meet the energy code requirements of r 13 and r 19 respectively. It has a lower r value per inch than closed cell foam and is vapor permeable. 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 foam can be over three times that with a density of 1 75 pounds per cubic foot or more. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch. Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart.

A foams r value is its resistance to heat flow or in other words how well they insulate. When applied on the interior open cell spray insulation provides performance advantages that differ from those of closed cell spray foam used on the exterior. Two inches of closed cell foam will provide r12 r14 of insulation. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 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. 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.