Below are photos of a recent project insulated with NCFI's closed cell foam, InsulStar®. The photos are of an unvented (cathedral) roof system. This type of system is becoming more popular today. 6 1/2" of foam was sprayed directly to the underside of the roof achieving over an R-40. Not only are superior R-values achieved in a limited space, but also structural strengthening and an air barrier. These benefits far exceed the use of conventional insulation materials such as fiberglass insulation.
The higher R-value per inch thickness allows you to install the necessary insulation in a thinner wall or roof cavity without sacrificing energy savings, thereby maximizing the space inside the thermal envelope. Using smaller studs and rafters requires less lumber and fewer trees.
