PolyFoam XPS Roofboard Extra

PolyFoam XPS Roofboard Extra is a lightweight, high compressive strength extruded polystyrene (XPS) board. The Polyfoam Roofboard Extra is suitable for multiple flat roof applications including, inverted roofs ballast, paving slabs and green roofs. 


  • High Compressive Strength
  • 15mm lap joint 
  • lightweight/easy to handle 
  • Robust and durable
  • Outstanding thermal performance 
  • Easy to install 
  • Resistance to water absorption  

*Always Refer Back To The Manufacturers Specification Document  

Download Specification


Polyfoam Roofboard Extra is a rigid but lightweight extruded polystyrene (XPS) board with high compressive strength and is used in conjunction with Polyfoam Slimline Zero Membrane as a Polyfoam Inverted Roof System.


Polyfoam Roofboard Extra is used for the thermal insulation of a wide variety of flat roofs including:

• in an inverted roof below ballast or paving slabs.

• in a green/garden roof.


The continuous service temperature limit of Polyfoam Roofboard Extra is up to +70o C.


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