What is the R-value (insulation value) of SPF insulation?
Southwest Building & Energy Technologies has a few different foam products of different densities. Our open-cell foam product has an R-Value of 3.5 per inch and in most applications, a house constructed with 2×4 studs will have 3.5 inches of open cell foam thus resulting in a total R-value of 12. If the house is constructed with 2×6 studs, the R-value when insulating with open cell foam can reach a maximum of R-20. Our primary closed cell foam has an R-value of 7.0 per inch and is usually sprayed between 2 to 3 inches thick resulting in an R-value between 14 and 21. Spray foam is the only insulation product that offers a true R-value because it is the only product that creates an air seal. To learn more about insulation and R-values, click here.
