Spray foam roofing is growing in popularity and challenging EPDM, TPO, built-up roofs and other commercial (and some residential low-slope roofs) roofing options for market share.
The technical name is SPF roofing, aka spray foam polyurethane roofing.
This is your comprehensive buying guide.
What is Spray Foam Roofing?
SPF foam roofing is a sprayed-on roofing material that features three layers of material. Specifics of how it is applied are in the next section.
Base SPF: The primary layer is 2-part spray foam polyurethane (SPF). The material has been used since the 1960s in various applications, so it is a known commodity with clearly defined pros and cons.
The spray foam is a mix of two substances, a polyol resin and an isocyanate. They are combined onsite in a mixing spray gun and applied.
This is closed-cell foam, which makes it waterproof and gives it a higher R-value of 6.6 per inch vs. about R-3.5 per inch for open-cell foam.
The result is a seamless and waterproof roofing material.