Closed Cell Spray Foam Insulation R Value

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 r value.

In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch. 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 costs more but also does a better job of controlling. Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties.

It s cheaper too though more expensive than fiberglass for the same 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. 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 insulation.

They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. It has a lower r value per inch than closed cell foam and is vapor permeable. Open cell spray foam is lighter and has a lower r value because gases in the material escape as it cures. Closed cell spray foam is dense and has a high r value relative to open cell and fiberglass insulation.

Just like for open cell foam r values are additive. Closed cell foam r6 r8. 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. 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 spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. Two inches of closed cell foam will provide r12 r14 of insulation. A foams r value is its resistance to heat flow or in other words how well they insulate. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch.

Closed cell spray foams are between 2 and 4 lbs. 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. 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. 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.