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Polyfoam Roofboard Extra is a high performance, rigid, extruded polystyrene board that is lightweight that has excellent structural strength and long term effectiveness.

Polyfoam Roofboard Extra is for use in flat roofing applications - from protected membrane roofs to single ply membrane roofs. Polyfoam Roofboard Extra has a Global Warming Potential (GWP) of less than five and Zero Ozone Depletion Potential (ODP).

Standard product features


  • Board length - 1250 mm.
  • Board width - 600 mm.

Edge profile:

15 mm lap joint.

Compressive strength (minimum):

300 kPa.

Thermal conductivity:

0.033 W/m·K.


  • BRE Environmental Product Declaration.
  • BRE BES 6001.
  • Global Warming Potential (GWP) <5.
  • Zero ODP (Ozone Depletion Potential).
  • Free from CFCs and HCFCs.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-65/410 Extruded polystyrene (XPS) board

Product specification

An important note about specifying



Polyfoam XPS Ltd


+44 (0)142 9855100

Product reference

Polyfoam™ Roofboard Extra


[50 mm]
[70 mm]
[100 mm]
[130 mm]
[160 mm]
[180 mm]
[200 mm]
[220 mm]
[230 mm]
[245 mm]

Manufacturer details

Hunter House Industrial Estate,
Hartlepool, TS25 2BE
Tel +44 (0)142 9855100
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