Spray Foam Roofing R Value

A spray foam roofing system has an r value of 6 6 per sq.

Spray foam roofing r value.

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. 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. Schedule a no obligation inspection today. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

Most of the time spray foam can be directly applied to existing roofing systems but in some cases a polyiso board is needed. For 6 inches r 15 or r 19 etc. 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 spray foam insulation.

Foam roofing provides green solutions for building sustainability and energy use reduction. A spray foam roof can be the last roofing system you ll ever need on a building. Tillotson provides maintenance and protection in spray on roofing spray foam insulation concrete leveling foundation repair and water proofing. Walking on the hard and durable foam roof surface feels somewhat like walking on a concrete sidewalk.

The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart. 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. Closed cell spray foam r values. Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties.

Generally foam is sprayed to a depth of 1 to 1 5 inches. For example closed cell spray foam depending on brand can offer an r 6 or r 7 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. Wind uplift tests performed by ul have shown that polyurethane foam actually enhances the wind uplift resistance of the substrate.

A typical 2 4 stud filled with open cell spray foam will have an r value between 10 5 and 14. Sprayed foam has an excellent r value and generally 1 of foam represents about 4 of fiberglass in terms of insulation. At year 10 20 a contractor will add more coating and granules. 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. 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.