Attic Spray Foam Insulation R Value

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. 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.

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Insulation level are specified by r value.

Attic spray foam insulation r value.

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. 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. The table below shows what levels of insulation are cost effective for different climates and.

Closed cell spray foam r values. Closed cell spray foam insulation. R value is a measure of insulation s ability to resist heat traveling through it. I can also tell you that 73 of all statistics are made up on the spot so please don t ask for.

Focusing on spray foam insulation materials there is a difference between the two main types. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Spray foam insulation is a great product. The higher the r value the better the thermal performance of the insulation.

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. 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. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. It has a lower r value per inch than closed cell foam and is vapor permeable.

Homes insulated with it can be some of the most efficient and comfortable homes built. 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. 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. However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and.

Open cell foam insulation values r3 r4.

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