Spray foam insulation’s main advantage is that it creates a thermal envelope that is more energy-efficient. Meaning less conditioned air consequently leaves the building. the end results would be a comfortable home and fewer energy expenditures.

Comparing spray foam insulation to more conventional rolled or blown-in insulation, it offers a higher R-value per inch. Spray foam insulation, according to diffen.com, has an R-value of 6 per inch of placed insulation. In comparison, fiberglass has an R-value that ranges from 2.2 to 3.5 inches, depending on the source. However, the air resistance value of foam spray cannot be compared to that of rolled or blown-in insulation.

Spray foam insulation has the additional advantage of expanding into cracks and sealing air leaks in the thermal envelope because it is sprayed on wet and expands as it dries. According to Energy Star, air leaks account for 25 to 40 percent of conditioned heating and cooling costs in the typical home.