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Polyfoam Floorboard is a rigid, lightweight extruded polystyrene (XPS) insulation. Available in Standard, Extra and Super grades, it offers a range of compressive strengths for use in applications ranging from domestic floor slabs to intensively loaded industrial flooring. In addition to lambda values as low as 0.033 W/m·K, the thermally efficient foam boards are also robust and moisture resistant, making them suitable for basement walls and floors, swimming pool basins and perimeter insulation below DPC.

General information

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Polyfoam XPS Ltd is a leading manufacturer of closed cell, extruded polystyrene insulation. The Polyfoam range is lightweight, strong, moisture resistant and easy to cut and shape, providing thermal performance and strength for the lifetime of the building. Polyfoam Floorboard Extra is suitable for basements, swimming pool basins and heavy-duty commercial, industrial and cold store flooring. It benefits from a thermal conductivity of 0.033 W/mK, a compressive strength of 300 kPa and is resistant to ground moisture penetration. Manufactured in the UK using a blowing agent with low global warming potential (GWP) and zero ozone depletion potential (ODP), Polyfoam XPS products are free from CFCs and HCFCs. They have Environmental Product Declarations (EPDs) and raw material procurement is certified to BES 6001 (Responsible Sourcing of Construction Products). The Polyfoam XPS factory in Hartlepool has been assessed as operating under an ISO 9001:2015 Quality Management System, an ISO 14001:2015 Environmental Management System, an ISO 50001 Energy Management System, and an OHSAS 18001 Occupational Health & Safety Management System. Polyfoam Floorboard Extra also benefits from BBA Agrément certification.


Extruded polystyrene (XPS)




1250 x 600 x 150 mm

1250 x 600 x 125 mm

1250 x 600 x 100 mm

2500 x 600 x 75 mm

2500 x 600 x 65 mm

2500 x 600 x 60 mm

2500 x 600 x 50 mm

2500 x 600 x 35 mm

2500 x 600 x 25 mm

Uniclass 2015 Extruded polystyrene (XPS) boards (Pr_25_71_63_29)
Specification data
Product Reference

Polyfoam Floorboard Extra


25 mm

35 mm

50 mm

60 mm

65 mm

75 mm

100 mm

125 mm

150 mm



Standard product features


  • Board length: 2500 mm; except ≥100 mm which are 1250 mm.
  • Board width: 600 mm.

Edge profile:

  • 25–75 mm: Square edge.
  • ≥100 mm: Lap joint.

Thermal conductivity:

0.033 W/m·K.


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

Compressive strength (minimum):

300 kPa.

Product Options

Perimeter insulation:

Polyfoam Floorboard Extra can be cut to size for use as perimeter insulation to slabs and screeds.

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Third party certifications

BBA Agrément Certificate

BBA 17/5454

Additional certifications:

  • ISO 9001:2015 Quality Management System
  • ISO 14001:2015 Environmental Management System
  • ISO 50001 Energy Management Systems