Styrofoam is an extruded polystyrene foam material developed by Dow and is more than an effective thermal insulant. It has a unique combination of physical and chemical characteristics that make it a key component within a wide variety of today's high performance composite structures. Styrofoam is lightweight, yet exceptionally strong, safe in use and capable of being precision - engineered. For use in floors, basements, flat and pitched roofing applications on both new build and refurbishment projects.