Most home builders are familiar with spray-in-place insulation products, which have become increasingly popular in recent years. But not many are aware that spray polyurethane foam (SPF) is also used as a roofing material. Spray foam roofing has been around for more than 30 years; it's used mainly to reroof existing flat roofs on commercial and residential buildings.

Our company does SPF roofing and insulation in Northern California, on both residential and commercial projects. And since homes with flat or low-slope roofs are common in our area, and many of them have old, leaky built-up roofing (BUR), residential reroofing is a considerable chunk of our business.

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