Closed Cell Spray Foam Insulation R Value

Closed cell foam r6 r8.

Closed cell spray foam insulation r value.

Open cell spray foam r values. 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. Two inches of closed cell foam will provide r12 r14 of insulation. The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart.

Closed cell spray foam insulation. A foams r value is its resistance to heat flow or in other words how well they insulate. Open cell spray foam is lighter and has a lower r value because gases in the material escape as it cures. It s cheaper too though more expensive than fiberglass for the same 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. 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 foam can be over three times that with a density of 1 75 pounds per cubic foot or more. 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.

It has a lower r value per inch than closed cell foam and is vapor permeable. Closed cell spray foam is dense and has a high r value relative to open cell and fiberglass insulation. Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. 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.

They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. 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. It costs more but also does a better job of controlling. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch.

In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 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. 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.