Styrofoam™ Brand Ag Board Extruded Polystyrene Insulation is durable XPS foam board that resists moisture infiltration, withstands high-pressure cleaning and reduces the potential for moisture condensation within the wall. 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, easy to install, and has shiplap edges, 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.