Styrofoam™ Brand Deckmate™ Plus Tapered Extruded Polystyrene Insulation is a durable foam insulation board featuring planed surfaces for maximum adhesion and tapered edges for positive slope. Plus, it’s easy, fast and flexible to use. The Styrofoam™ Brand XPS product line gives you the proven thermal and moisture performance of the original XPS, plus the product options you need to design and build energy-efficient, resilient structures all the way to the top. 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.