DuPont™ Styrofoam™ Brand Roofmate™ Insulation is an extruded polystyrene (XPS) insulation engineered for use on heavyweight decks (e.g., reinforced concrete) with a ballast layer of gravel or concrete slabs. Because it helps the roof membrane maintain a steady temperature, DuPont™ Styrofoam™ Brand Roofmate™ minimizes the harmful effects of freeze-thaw cycles, weathering and physical damage. It’s lightweight and easy to install, which makes the work go faster, and it’s readily available through our wide distributor network. When and where you need it, Styrofoam™ Brand is there.