Extruded polystyrene sheets (XPS) are thermal insulation boards that are both strong and durable, making it an ideal product for use across a range of construction and building applications and wall cladding insulation for building construction – both residential and commercial. When insulation comes into contact with water it can have an adverse effect on its ability to thermally insulate; but when faced with extreme weather conditions, XPS polystyrene still preserves its thermal and physical properties thanks to its high-density cell structure, making it practically impervious to water.