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Polyfoam™ Floorboard Extra

Verified by manufacturer 6 months ago

Polyfoam Floorboard Extra 25

Polyfoam XPS Ltd Variant:
Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

A rigid extruded polystyrene (XPS) board resistant to compression and static loads.

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+44 (0)142 9855100 Website


Suitable for almost any floor construction including:

  • Below a concrete slab;
  • Below a screed;
  • Below chipboard.

Application fields include:

  • Ground floor – insulation below slab;
  • Ground floor – insulation above slab (floating floor);
  • Underfloor heating systems;
  • Basements;
  • Swimming pool basin.


A rigid extruded polystyrene (XPS) board highly resistant to compression and that can withstand both occasional and long term static loads.

Features and benefits:

  • Square edged boards. Larger boards are lap jointed.
  • Very high compressive strength.
  • Protects the damp proof membrane from damage.
  • Highly resistant to water absorption.
  • Robust and can tolerate traffic from following trades.
  • Represents no known threat to the environment and has zero Ozone Depletion Potential (ODP) and a Global Warming Potential (GWP) of less than five.
  • 100% recyclable.
  • BBA approved.
  • BRE Environmental Product Declaration (EPD).
  • BES 6001 Responsible Sourcing for Construction Products.

Technical characteristics:

  • Vapour resistivity: The XPS content of Polyfoam Floorboard Extra has a water vapour resistivity of 625 MNs/g·m when tested in accordance with EN 12086.
  • Moisture absorption: 0.7% by volume when tested in accordance with EN 12087.
  • Durability: Continuous service temperature limits up to +70ºC.

General information




High density extruded polystyrene (XPS)




2500 mm

1250 mm


600 mm


25 mm

30 mm

35 mm

50 mm

60 mm

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Pr_25_71_63_29 Extruded polystyrene (XPS) boardsPrimary


E20/200 Proprietary underslab insulation

E20/30 Underslab insulation

K11/115 Battened plywood floating floor

K11/125 Battened particleboard floating floor

K11/135 Battened oriented strand board floating floor

K11/145 Battened cement-bonded particleboard floating floor

K11/20 Battened particleboard floating floor

K11/215 Plywood floating floor

K11/225 Particleboard floating floor

K11/235 Oriented strand board floating floor

K11/245 Cement bonded particleboard floating floor

K11/25 Particleboard floating floor

M10/290 Floating construction

M10/40 Floating construction

Specification data - Extruded polystyrene (XPS) boards

Third party product certification

BBA 17/5454 (product sheet 1); BES 6001; BRE EPD number: 000082.

Compressive strength (minimum) at 10% compression

300 kPa.

Thermal conductivity (maximum)

0.033 W/m·K.


25 mm.

Face size (length x width)

1250 x 600 mm.


Lap joint.

Global warming potential


Thermal resistance

0.75 m²K/W.



Water vapour resistance

625 MNs/g·m.

Water absorption


Sustainability data

Contains Red List materials


Country of material origin

United Kingdom

Country of product manufacture

United Kingdom

Embodied carbon

A1-A3 (production stage) as defined in BS EN 15804

121 kg CO₂ eq/m³


Information on recycling is contained in the environmental datasheet in the technical support section of the manufacturer’s website: polyfoamxps.co.uk


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Platform Compatible Version




Third party certifications

BBA Agrément Certificate

BBA Agrément Certificate

BBA Agrément Certificate 17/5454 Product Sheet 1 - Floorboard Standard & Extra

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