Spray Polyurethane Foam (SPF) adheres to just about every traditional roofing material so it can be installed over concrete, wood, steel, and most existing roof systems. This saves on the expense of roof removal and landfill fees, and is considered to be more environmentally friendly. SPF Roofing installers can spray apply a tapered roof system with the foam which eliminates the need for costly tapered insulation systems. The cants and vertical wall terminations are also spray applied making them an integral part of the roof system and minimizing additional component costs and flashing materials.