Closed Cell Spray Foam Insulation R Value

Just like for open cell foam r values are additive.

Closed cell spray foam insulation r value.

Two inches of closed cell foam will provide r12 r14 of insulation. Closed cell spray foams are between 2 and 4 lbs. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts.

A foams r value is its resistance to heat flow or in other words how well they insulate. The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart. Closed cell foam has a higher r value than open cell foam usually about 6 0 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.

These r values are rough averages. Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. Closed cell spray foam has an r value of about 6 0 per inch r 6 while open cell spf comes in at roughly r 3 5. 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 spray foam insulation. 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 has a lower r value per inch than closed cell foam and is vapor permeable. Open cell spray foam r values.

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. R value is a way to denote a material s insulating properties and the higher the number per unit thickness the better the insulation 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. Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more.

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 r6 r8. 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.