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. When and where you need it, Styrofoam™ Brand is there.