Open Cell Spray Foam 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.

Open cell spray foam r value.

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. It has a lower r value per inch than closed cell foam and is vapor permeable. Two ingredients conventionally called a and b components are mixed on site using special equipment mounted in a trailer. Closed cell foam has a higher r value than open cell foam usually about 6 0.

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 provides a higher r value per inch 6 5 than less expensive insulation types like cellulose and fiberglass 3 5 to 3 7. Closed cell spray foam insulation. Ft with an r value insulation factor of about 3 5 per inch.

Most open cell foam has a density of about 5 pounds per cubic foot. 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. 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. 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. 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. 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 foam weighs between 0 4 and 0 5 lbs cu.

Closed cell spray foam insulation is vapor and air impermeable and is applied with a minimum of 2 on average with use on on interior and exterior building applications. Closed cell spray foams are between 2 and 4 lbs. 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.

Closed cell foam can be made with densities as high as 1 7 to 2 0 lbs cu. The r value for open cell is typically around 3 7 at 1 thick and varies by manufacture. A foams r value is its resistance to heat flow or in other words how well they insulate. The higher density not only allows for it to be molded for decorative or light structural uses it also provides r values of about 6 0 per inch.

Two inches of closed cell foam will provide r12 r14 of insulation. Most spray polyurethane foam is called two component foam.