Spray foam insulation outperforms all other types of insulation making this method extremely cost effective. The insulation is created by using two types of composite materials, polyurethane and isocyanate. When combined, these two materials chemically react to each other causing the combined substance to expand and harden. The result is a protective layer of insulation that provides an air-tight, waterproof seal. This type of insulation not only has a long life-span and deters mold, it also works to lower energy use by 50% or more. This translates into significant energy cost savings.