What is the R-Value of Spray Foam Insulation?

The R-Value varies depending on the depth of the application and the type of foam used. The characteristic that makes spray foam the optimum solution for insulating is its ability to air seal the space in which it is applied. Fiberglass, blown in insulation, and cellulose may have a similar or higher r-value, but all of that is lost without a proper air seal. Spray foam is the only insulation that provides a thermal, air, and moisture barrier all in one application, making it superior to other insulation options.