Styrofoam™ Brand Cladmate™ CM20 Extruded Polystyrene Insulation is a rigid foam insulation board with both shiplap edge and butt edge treatments. It is designed for use in residential and commercial applications where a higher compressive strength is not needed. 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.