What is Spray Polyurethane Foam Roofing (SPF)?

SPF is a closed-cell roofing material formed by combining two liquid components. When these two materials meet in the mixing gun, they expand 20 to 30 times their volume immediately, forming rigid polyurethane foam (PUF). This foam is sprayed on the entire roof to the desired thickness, usually 1-2 inches, to form a seamless monolithic surface including flashing, penetrations and parapet walls. This eliminates seams and cold joints, the primary source of major leaks, and provides a durable waterproof covering that bonds tightly to nearly any properly prepared surface. For more than 30 years Sprayed Polyurethane Foam (SPF) has been used as a roofing and insulation material. SPF systems have been proven through comprehensive, independent studies to be dependable, long lasting, and very affordable. There are foam roofs today that have been in place for more than 30 years, and if properly maintained they should be able to last indefinitely. SPF has an initial R-value of 7.14 per inch ...  more