Polyfoam Floorboard Extra
Description
Polyfoam Floorboard Extra is a rigid extruded polystyrene (XPS) board with a Global Warming Potential (GWP) of less than 5 and Zero Ozone Depletion Potential (ODP). It is a square edged board that has high compressive strength (300 kPa).
Product Benefits
- - High compressive strength – protects the damp proof membrane from damage
- - Highly resistant to water absorption
- - Robust and can tolerate traffic from following trades
Product Application
Polyfoam Floorboard Extra is suitable for almost any floor construction including:
– Below a concrete slab
– Below a screed
– Below chipboard

Ground Floor
(Insulation under slab)
Learn more

Ground Floor
(Insulation above slab)
Learn more

External wall
(Below DPC)
Learn more
Technical Specification
The thermal conductivity of Polyfoam Floorboard Extra is 0.031 W/mK
The water vapour resistivity of Polyfoam Floorboards is 705MNs/ g.m when tested in accordance with BS EN 12086.
Polyfoam Floorboards have a moisture absorption of 0.7% by volume when tested in accordance with EN 12087 and can be laid in standing water or up against wet concrete with negligible impact on the performance of the product.
The BRE have approved and issued Environmental Product Declarations (EPDs) for the Polyfoam range of products in accordance with EN 15804:2012+A1:2013.
Polyfoam Floorboard Extra represents no known threat to the environment and has Zero Ozone Depletion Potential and a low Global Warming Potential. Polyfoam Floorboard Extra is non biodegradable and 100% recyclable.
The continuous service temperature limit of Polyfoam Floorboards is up to +70º C.
Polyfoam Floorboards are highly resistant to compression and withstand both occasional and long term static loads. Load bearing construction elements should be designed to adequately support the combination of imposed and dead loads without creating excessive deflection.
Polyfoam Floorboards are lightweight and easy to handle and install. Polyfoam Floorboards are supplied in four sided packaging designed to be easily recognised and are labelled with identifying product and manufacturing data. Ensure the boards are not stored close to open flames or other ignition sources and avoid volatile organic compounds and chemicals such as solvents.
Polyfoam Floorboards should not be left exposed to prolonged sunlight as this will result in surface degradation. When outside storage for extended periods is required cover the products with opaque/light coloured sheeting.
| Length (mm) | Width (mm) |
|---|---|
| 1250* / 2500 | 600 |
| Thickness (mm) | Declared Thermal conductivity (W/mK) |
Thermal resistance (m2K/W) |
Compressive strength (kPa) |
|---|---|---|---|
| 25 | 0.031 | 0.80 | 300 |
| 30 | 0.031 | 0.95 | 300 |
| 35 | 0.031 | 1.10 | 300 |
| 50 | 0.031 | 1.60 | 300 |
| 60 | 0.031 | 1.90 | 300 |
| 65 | 0.031 | 2.05 | 300 |
| 75 | 0.031 | 2.40 | 300 |
| 80 | 0.031 | 2.55 | 300 |
| 100* | 0.031 | 3.20 | 300 |
| 125* | 0.031 | 4.00 | 300 |
| 150* | 0.031 | 4.80 | 300 |
Proudly made in Britain with green focused credentials
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.
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).


