Our 6mm XPS Insulation Boards are specifically designed for use with Fastwarm® electric underfloor heating systems on concrete or screeded substrates. They’re ideal for projects where minimising floor height is important, without compromising on thermal efficiency.
The Fastwarm® XPS boards are engineered to handle compression strengths up to 30 tonnes per m² while remaining extremely lightweight and easy to install—making them a cost-effective and high-performance choice for insulation under tiles or floating floors.
- Approved by Ultra Tile – Fully compatible with flexible adhesives.
- Excellent Thermal Performance – Just 0.031 W/mK conductivity.
- Compact 6mm Thickness – Ideal for minimal build-up heights.
- Excellent Sound Insulation – Helps reduce noise transmission.
- Precision Cut – Easily trimmed on site with a utility knife.
- Generous Coverage – Each board measures 1200mm x 600mm (0.72m²).
- Lightweight & Durable – High strength, easy handling.
Installation Guidance
The Fastwarm® XPS insulation boards can be used beneath both tiled flooring and floating floor installations (such as laminate or engineered wood). However, installation methods will vary depending on the type of flooring and subfloor surface.
Undertile Installations:
Fix boards to the subfloor using a suitable flexible tile adhesive. When tiling over a timber subfloor, we recommend using our dedicated Fastwarm® Tile Backer Boards, which can be mechanically fixed in addition to being bonded with flexible adhesive.
Underwood Installations:
Lay the XPS insulation boards directly onto a clean, dry, and level subfloor in a brickbond pattern. Secure the joints using our heat-resistant Fastwarm® Duct Tape for added stability beneath floating floor finishes.
Please note: Boards are supplied in black. Blue colour shown in some images is for illustration only.
Choose the ideal board thickness to suit your project's build-up and insulation needs: 10mm | 20mm | 30mm | 50mm
| Thickness | 6mm, 10mm, 20mm, 30mm & 50mm |
|---|---|
| Board Dimension | 1200mm x 600mm |
| Material Type | Expanded Polystyrene |
| Thermal Conductivity | 0.031 W/mk |
| Material Density | 33 kg/m3 |
| Compressive Strength | 30 t/m2 |
| Moisture Absorption | < 0.1 vol % |
| Euroclass Fire Rating | E Euroclass |
Our May Bank Holiday Delivery Times
| Order Date | Order Time | Expected Delivery Date |
|---|---|---|
| Fri 23rd May* | Before 4:00pm | Tues 27th May |
| Fri 23rd May | After 4:00pm | Wed 28th May |
| Sat 24th May | All day | Wed 28th May |
| Sun 25th May | All day | Wed 28th May |
| Mon 26th May | All day | Wed 28th May |
| *Any pallets to be delivered on Saturday 24th May will need to be ordered before 2:30pm on Friday 23rd May. | ||
Free Delivery as Standard!
As standard we include 2 - 3 working day delivery on all orders delivered to the UK mainland. * A £5 delivery charge will be applied to all orders below £20.
Delivery cut off times
Our final delivery time for Mondays to Thursday is 4:30pm. To give us a bit more time to ensure weekend deliveries are handled and our couriers have time to collect, the final delivery time on Fridays is 4:00pm.
2-3 working day delivery
Next working day
Next working day before 10:30
Saturday Delivery
* A £5 delivery charge will be applied to all orders below £20.
Other Delivery Options
Pre 10:30am and Saturday delivery services are available on orders placed before 4:30pm. Any order placed before 4:30pm on a Friday will be delivered on the following Monday (unless its a bank holiday) so please select a Saturday service if a weekend delivery is required.
Delivery outside the UK
Delivery outside the mainland UK may be arranged by prior agreement. You will be notified of the amount of the charge for this service and will at that point have to make a decision whether you wish to proceed wth your order.
Important: Our deliveries rely on third party couriers, so, whilst we make every effort to deliver your order on the specified date and time, unfortunately there may be occasions when this will not be possible due to external influences. Due to this we strongly recommend you ensure you have received your order before any tradespeople/builders are scheduled to commence work.
Still Unsure? Talk to an expert
If you need any guidance or further information our highly experienced team are on hand to help.
Get in touch using our contact form or give us a call on 0800 023 4203 or 01268 744 479.
