Extruded polystyrene insulation (XPS) has unique properties that differentiate it from other types of foam plastic insulation and therefore make it ideal for a number of roof designs.

Sometimes considered “the other roof insulation,” XPS is generally specified when higher compressive strength, higher water resistance and higher thermal resistance in the presence of water are needed. Those characteristics make XPS the preferred choice in green-planted roof systems, protected or inverted membrane plaza deck systems, white or “cool” single-ply roofing and metal roofing systems.