SOPRA-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 ASTM C578–14, Type VI.

Product Properties

  • Material Extruded Polystyrene
  • Use Insulation


• Insulation boards are laid flat on the ground for applications under concrete slab
• When installing multiple layers of SOPRA-XPS, all joint should be staggered between layers
• When another layer of SOPRA-XPS 40, 60 & 100 insulation is required, it should be installed with staggered joints without being adhered to the first layer

• Adhere with SOPRASEAL LM 200 T adhesive or an other adhesive compatible with extruded polystyrene on the foundation walls
• When another layer of SOPRA-XPS 40, 60 & 100 insulation is required, it should be installed with staggered joints on the first layer


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