Closed Cell Polyurethane 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.

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. 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. It measures the effectiveness at stopping energy loss by way of conduction one of the 3 forms of energy transfer.

A foams r value is its resistance to heat flow or in other words how well they insulate. 1 8 2 pound polyurethane foam has the highest r value of readily available spray foam insulation used in homes and buildings. Most spray polyurethane foam is called two component foam. 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.

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. Spray polyurethane foam comes in a range of densities and cell structure. The bottom line is that spray polyurethane foam is better than any other type of insulation for reducing air leakage.

R value is an important insulation term about measurement. With high yield and excellent adhesion it s an. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch. 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. Closed cell open cell spray foam r values. Closed cell spray foams are between 2 and 4 lbs. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts.

Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more. Closed cell foam r6 r8.