Sopra-XPS 40 Rigid Insulation BoardSOPRA XPS 40 is a rigid thermal insulation board made of high density extruded polystyrene with squared edges on its four sides. It is composed of closed cell foam. SOPRA XPS 40 is designed for applications requiring high density insulation on which heavy loads will be applied. It is mainly used for SOPREMA foundation systems under slabs, protected membrane roofing systems (inverted), parking decks, and plaza decks. Compliant with CAN ULC S701. 1,