Open Cell Foam R Value

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.

Open cell foam r value.

A foams r value is its resistance to heat flow or in other words how well they insulate. 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. Just like for open cell foam r values are additive. Open cell foam has an r value of about 3 5 to 3 7 per inch while closed cell foam has an r value of about 6 per inch.

Two inches of closed cell foam will provide r12 r14 of insulation. 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. Closed cell foam can also increase the racking strength of attic walls which. Closed cell spray foams are between 2 and 4 lbs.

Products with a higher r value have a higher cost but have an increased capacity to resist heat flow and therefore provide greater insulation. 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 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 foam has a higher r value than open cell foam usually about 6 0.

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. 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 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.

Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more. It provides r values that range from 3 6 to 4 2 per inch. The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart. Each type comes with unique advantages.

Nevertheless open cell spray foam does offer superior and consistent thermal insulation. Most open cell foam has a density of about 5 pounds per cubic foot. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. Also called styrofoam insulation this is the least expensive material.