Spray Foam Roofing R Value

Spray foam offers better insulation properties than any other roofing system on the market.

Spray foam roofing r value.

A typical 2 4 stud filled with open cell spray foam will have an r value between 10 5 and 14. Walking on the hard and durable foam roof surface feels somewhat like walking on a concrete sidewalk. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. 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.

Foam roofing provides green solutions for building sustainability and energy use reduction. At year 10 20 a contractor will add more coating and granules. Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. Schedule a no obligation inspection today.

Closed cell spray foam insulation. It has a lower r value per inch than closed cell foam and is vapor permeable. A spray foam roofing system has an r value of 6 6 per sq. Wind uplift tests performed by ul have shown that polyurethane foam actually enhances the wind uplift resistance of the substrate.

Closed cell spray foam r values. Sprayed foam has an excellent r value and generally 1 of foam represents about 4 of fiberglass in terms of insulation. Thanks to spray foam s properties that allow it to be spray applied as long as you can get your equipment on or near the roof you can install a spray foam roof. A spray foam roof can be the last roofing system you ll ever need on a building.

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. For 6 inches r 15 or r 19 etc. Generally foam is sprayed to a depth of 1 to 1 5 inches. Spray polyurethane foam roofing has the highest rated insulation r value available.

Since a spray foam system consists of spray foam coating and granules after 10 20 years some of the coating and granules will naturally wear away. The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart. 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. If you install 2 inches of iso board r 11 and 3 inches of spray foam r 19 8 you ll be over an r 30.

The foam never gets touched and never loses 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.