The world's largest supplier of underfloor heating

Warmup Insulation Boards

Warmup Insulation Boards

RRP: £27.59£17.99

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Warmup® insulation board is a water resistant, insulated tile backer board made of extruded polystyrene, faced on both sides with a fibreglass mesh embedded into a thin cement polymer mortar.

The board is designed to withstand a load of 30 tonnes per square metre and is ideal for use with underfloor heating as it prevents the heat from penetrating down into the substrate below.

As a wall tile backer board, tiles can be fixed directly onto the surface without prior preparation and, being totally waterproof, is suitable for bathrooms or showers.

In testing, heat-up time was cut from over 2 and a half hours to just 20 minutes. This data applies to Warmup heating products only.

The Warmup insulation board is the perfect system for quality underfloor insulation. Waterproof and unaffected by the freeze/thaw cycle, the Warmup tile backing insulation boards can be installed onto concrete and timber subfloors.

  • Step 1

    Make sure the floor is clean, levelled and dirt free. Using a floor trowel comb a thick bed of tile adhesive over the sub floor. (for best results use a cement based adhesive).

  • Step 2

    Lay the Warmup Insulation board down in place pressing it down firmly. If possible lay the backing boards out in brick like fashion. When tiling the floor leave a 20mm gap from the edge of the wall for the connection to a Warmup thermostat.

  • Step 3

    With the tiles laid ontop seal the joints with a fibreglass mesh. For wet rooms such as bathrooms and showers, you can further waterproof by sealing the joints with waterproof tape or acrylic sealant.

  • Step 4

    Now lay your chosen Warmup heating system onto the Warmup insulation backing board and fix into position. Cover the heating element using your chosen floor type. For guides on how to install heating elements please see their relevant product pages.

Board dimensions1250mm x 600mm (0.75 m2)
Thickness6mm, 10mm (standard), 20mm, 50mm
Compressive strengthAble to withstand load of 3.0 kg/cm2 (300kN/m2)
U values (W/m2K)6mm - 4.50, 10mm - 2.70, 20mm - 1.35, 50mm - 0.54
Water absorption (capillary)Nil
Fire ratingClass "O" / "B1" (DIN 4102)/ "E" (EN13501-1)
NameProduct CodePrice
Warmup Insulation Boards 6mm1147£17.99
Warmup Insulation Boards 10mm1146£19.00

Delivery options

At The Underfloor Heating Store, we strive to make every step of your order as easy and convenient as possible, from finding the right underfloor heating setup to best suit you to taking delivery of your system the very next day.

We're proud to offer a range of delivery options to suit you, including free delivery on all of our orders or next working day delivery for a fixed price of £4.99.

Our delivery options

  • 2-3 Working Days (3-5 working days on wet room and energy efficiency products)
  • FREE
  • Next Working Day
  • £4.99 (order before 4pm, Monday to Friday)
  • Next Working Day Before 10.30am
  • £14.99 (order before 4pm, Monday to Friday)
  • Saturday Delivery
  • £29.99 (order before 4pm on Friday)