Fastwarm® Classic Underlay Insulation Boards are a cost-effective and practical solution for improving thermal efficiency beneath underwood and undercarpet foil heating systems. Designed specifically for use with foil-based heating, these 6mm thick EPS boards also provide excellent support as a traditional underlay for floating floors, such as laminate or engineered wood—even in spaces without underfloor heating.
- High Thermal Performance – Delivers a thermal conductivity of 0.034 W/mK, helping to minimise heat loss and reduce energy consumption.
- Strong & Moisture-Resistant – High-density EPS construction (32 kg/m³) with excellent resistance to moisture (<0.1 vol%).
- Sound Reducing – Offers up to 20dB impact sound reduction, improving acoustic comfort in residential and commercial applications.
- Lightweight & Easy to Fit – Supplied in manageable 850mm x 600mm boards, each covering 0.51m², for quick and simple installation without specialised tools.
Please note: Classic Underlay is only suitable for use with foil heating mats and should not be used with electric undertile heating systems or beneath levelling compounds. For thicker or alternative insulation needs, see our XPS Insulation range, available in multiple thicknesses.
Each sealed pack contains 60 boards and covers a total area of 30.6m², making it the most economical choice for larger flooring areas that require efficient and reliable insulation.
Need a smaller pack? Try our 6mm EPS Insulation Pack Covers 10m² (20 Boards) or 6mm EPS Insulation Pack Covers 20m² (40 Boards).
| Thickness | 6mm |
|---|---|
| Board Dimension | 850mm x 600mm |
| Material Type | Expanded Polystrene |
| Thermal Conductivity | 0.034 W/mk |
| Material Density | 32 KG/m3 |
| Load Strength | 10 t/m2 |
| Moisture Absorption | < 0.1 vol% |
| Sound Impact Rating | 20db |
| Euroclass Fire Rating | C 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.
