Spray On Foam Roof R Rating

This is not an issue specific to spray foam as much as it is a characteristic of peel and stick membranes.

Spray on foam roof r rating.

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. Encapsulating the rafter or top truss chord roof framing members with spray foam will improve the energy efficiency of the attic space. Closed cell spray foam r values. A spray foam roof can be the last roofing system you ll ever need on a building.

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Wood has an r value of about one per inch of thickness. At year 10 20 a contractor will add more coating and granules. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. For example energy star recommends r 30 for a roof in the southern united states r 38 for the middle of the country and r 49 for the northern part of the country. This r value is similar to that of r13 fiberglass batting.

As a benchmark one inch of solid wood has an r value of 1. Causing the timbers to rot. 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. Spray foam insulation r values.

The foam never gets touched and never loses r value. Due to spray foam insulation being such an upcoming method of insulation there have been quite a few misconceptions about the effectiveness and dangers of its use. Amongst all of the popular types of insulation currently used by the industy spray foam insulation features the highest r value per inch. For building owners who seek reliable lasting roof protection that offers long term cost effectiveness spray polyurethane foam roofing offers a great solution.

A typical 2 4 stud filled with open cell spray foam will have an r value between 10 5 and 14. Today we discuss one of the highest performing and most affordable roof systems in commercial roofing spray polyurethane foam. The rapid growth of sprayed foam insulation in building construction thanks in part to its immediate and long term. Although spray foam insulation has been in use since the 1940s primarily for aircraft for the past 30 years continual product innovation has seen the increased adoption of spray foam insulation in residential and commercial construction.

For 6 inches r 15 or r 19 etc.