The life expectancy of spray foam insulation ranges from 80 to 100 years. This reflects the whole lifespan of your home for the vast majority of families. The insulation known as spray foam is constructed of polyurethane. Polyurethane has a very long lifespan. This material is able to endure substantial changes in temperature, the accumulation of moisture, as well as the growth of mold and fungus. The standard fiberglass insulation only has a life expectancy of 15 - 20 years.