Fastwarm® 20mm Tile Backer Boards offer an excellent mid-thickness solution for projects where both thermal insulation and subfloor stability are critical. These boards are specifically engineered to work alongside our Fastwarm® 150w/200w/cable electric underfloor heating systems.
Despite their added thickness, they remain lightweight and are easily cut with a craft knife, making them perfect for installation in larger rooms or renovations where extra insulation is desired.
Boards can be laid over timber with mechanical fixings or bonded directly to solid substrates using flexible tile adhesive.
- Waterproof – Fully waterproof construction, approved by Ultra Tile adhesive manufacturers.
- High Insulation Performance – Thermal conductivity of just 0.034 W/mK helps minimise heat loss.
- Excellent Sound Insulation – Improves acoustic comfort in any room.
- Ultra-Lightweight & Easy to Cut – Easily trimmed on-site with a utility knife.
- Strong & Durable – Supports compression loads up to 30 tonnes per m².
- Multi-Surface Application – Suitable for walls and floors (follow correct installation methods).
- Flexible Installation Options – Mechanically fix to timber or bond to solid subfloors with adhesive.
- Standard Size – Each board measures 1200 x 600 mm (0.72m²).
This board is 20mm thick — perfect when higher thermal resistance or build height is required. A 10m² area will generally need 14 boards.
Please note: Always use flexible tile adhesive and secure timber floors with mechanical fixings every 300mm.
Need a different thickness? Other options available: 6mm | 10mm | 12.5mm | 30mm | 50mm
Choose the board that best balances insulation performance with your floor build height.
Thickness | 6mm, 10mm, 12.5mm, 20mm, 30mm & 50mm |
---|---|
Board Dimension | 1200mm x 600mm |
Material Type | Extruded Polystyrene, Fibreglass Mesh & Cementitious Coating |
Thermal Conductivity | 0.027 W/mk |
Material Density | >30 kg/m3 |
Compression Strength | 30 t/m2 |
Vertical Tile Weight Load | 50 kg/m2 |
Moisture Absorption | <0.1 vol % |
Euroclass Fire Rating | B Euroclass |
Our August Bank Holiday Delivery Times
Order Date | Order Time | Expected Delivery Date |
---|---|---|
Thu 21st August* | Before 4:30pm | Fri 22nd August |
Thu 21st August | After 4:30pm | Tues 26th August |
Fri 22nd August* | Before 4:00pm | Tues 26th August |
Fri 22nd August | After 4:00pm | Wed 27th August |
Sat 23rd August | All day | Wed 27th August |
Sun 24th August | All day | Wed 27th August |
Mon 25th August | All day | Wed 27th August |
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.