Styrofoam^™ Brand SM30 XPS Extruded Polystyrene Insulation is a foam insulation board that meets the needs of the commercial foundation and building floor slab market. It also can be used for attics, foundations/slabs and crawlspaces in residential applications. The product’s closed-cell structure resists water pickup, enabling it to retain a high R-value over time – a necessary property in wet, below-grade commercial foundation applications. The Styrofoam^™ Brand XPS product line gives you the proven thermal and moisture performance to design and build energy-efficient, resilient structures for all six sides of your commercial building. It’s lightweight and easy to install, which makes the work go faster.