Attic Spray Foam Insulation 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.

Attic spray foam insulation r value.

However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and. Insulation level are specified by r value. Open cell foam insulation values r3 r4. Recommended home insulation r values.

According to industry publication fine home building the r value for open cell spray foam is between r 3 5 r 3 6 per inch. 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. The table below shows what levels of insulation are cost effective for different climates and. Homes insulated with it can be some of the most efficient and comfortable homes built.

For 6 inches r 15 or r 19 etc. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. I can also tell you that 73 of all statistics are made up on the spot so please don t ask for. Closed cell spray foam insulation.

It has a lower r value per inch than closed cell foam and is vapor permeable. Open cell spray foams are between 5 and 1 lbs per cubic foot and have an r value of 3 0 4 0 per inch of insulation. R values are additive so you can multiple the number of inches of insulation thickness times the r value to arrive at a total insulation value. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used than batts.

Closed cell spray foam r values. I ve been in plenty of these homes and can tell you that when spray foam is installed properly they outperform 99 of fiberglass batt insulated stick built homes. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. The higher the r value the better the thermal performance of the insulation.

Spray foam insulation is a great product.