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    Flat Roofs

    Product Type:

      Extruded Polystyrene (XPS)

    Market Sector:


    Polyfoam Roofboard Extra

    Product Description:

    Product Description:

    For inverted, green and blue roofs.


    The declared thermal conductivity of Polyfoam Roofboard Extra is 0.033W/mK.

    The design thermal conductivity, including the moisture correction factor of the boards, is 0.034W/mK for thicknesses ≥ 100mm. For thicknesses under 100mm it is 0.035W/mK


    Polyfoam Roofboard Extra is a rigid, lightweight extruded polystyrene (XPS) insulation. In addition to  a lambda value as low as 0.033 W/mK, the thermally efficient foam board is also robust and moisture resistant and able to resist freeze/thaw cycles, making it ideal for inverted roofs below ballast and paving slab as well as green, blue and garden roofs.


    • High compressive strength of 300 kPa
    • XPS insulation is unique among widely-available thermal insulation materials for its tolerance of freeze/thaw cycles
    • Polyfoam XPS insulation is a robust solution that will stand up to the demands of any construction site
    • Global Warming Potential (GWP) <5
    • Zero ozone depletion potential (ODP)
    • Polyfoam XPS products are free from CFCs and HCFCs
    • Certified Green Guide rating A+
    • Product Specific, Environmental Product Declarations
    • BES 6001: Responsible Sourcing of Construction Products
    • Inverted Roof system BBA Agrément certification (17/5454-2)
    • Manufactured in UK


    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, blue or garden roof
    • conventional warm flat roof