Spray polyurethane foam (SPF), better known as spray foam roofing, is made up of two liquid chemical compounds: isocyanate and polyol. Together, they form the base of SPF that sticks to the roof deck. SPF is applied onto the surface as a liquid, then expands into foam as it dries and conforms to the roof. Once the application is complete, it creates a monolithic layer across the existing roof.
Although it’s most popular for flat roofs, spray foam roofing is a flexible, fluid-applied membrane that easily covers slopes, shifts, and irregularities. Because of this, it’s compatible with high-pitched and domed roofs, as well. This highly effective roofing system has evolved significantly since the 1960s, and as a result, commercial building owners continue to choose this system thanks to its several benefits.