Closed Cell Polyurethane 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 polyurethane spray foam insulation 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 foam has a higher r value than open cell foam usually about 6 0 per inch. Closed cell foam r6 r8. 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.

The bottom line is that spray polyurethane foam is better than any other type of insulation for reducing air leakage. Two inches of closed cell foam will provide r12 r14 of insulation. R value is an important insulation term about measurement. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch.

A foams r value is its resistance to heat flow or in other words how well they insulate. 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. Johns manville corbond iii closed cell spray polyurethane foam insulation offers and r value of r 7 per inch and can be applied in a single pass to a maximum of 3 5 inches providing superior thermal performance with seamless air sealing and moisture control in a single step. Spray polyurethane foam comes in a range of densities and cell structure.

It measures the effectiveness at stopping energy loss by way of conduction one of the 3 forms of energy transfer. Multiple immediate passes with no wait time may also be applied. With foamed in place insulation it is relatively easy though not inexpensive to fill wall and ceiling cavities completely. Just like for open cell foam r values are additive.

Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. 1 8 2 pound polyurethane foam has the highest r value of readily available spray foam insulation used in homes and buildings. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. Low density foams are referred to as open cell spf while higher density foams are referred to as closed cell foam.

With high yield and excellent adhesion it s an. Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more.