XPS Insulation Board

RRP From: £3.14

XPS Underfloor heating insulations are designed for use directly under tiles and stone floors. When used with underfloor heating the board greatly increases the response rate and overall efficiency of all under floor heating systems. These boards are especially effective when installed over a concrete sub-floor. Each board is 620 x 600mm.

IMPORTANT! All our electric underfloor heating systems must be run via suitable 'Fused Spurs'. Please consult an electrician if in doubt.

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XPS Underfloor Heating Hard Insulation Boards

XPS Insulation Boards | Underfloor Heating Insulation!

XPS insulation for both wooden and concrete sub floors, work hand in hand however, this is especially necessary on a concrete sub floor with underfloor heating installed as the concrete will drain the heat from your underfloor heating downwards and require heating X mm of concrete before heating your room. However, this can be avoided, with our low-cost Underfloor Heating Insulation Board which will increase the efficiency of your underfloor heating system and reduce your overall heating bill. The XPS insulation boards measure 620 x 600mm for the 6mm and 10mm. However, the 20mm board measures 600 x 600mm.

Download XPS Insulation Data Sheet


XPS Insulation Board

  • High thermal insulation capacity, (blocks out cold)
  • Totally inert, (doesn’t degrade with time or conditions)
  • Light easy and safe to handle
  • Easy to cut with sharp knife / fine tooth saw
  • Resistant to tile, building cement and most other building compounds
  • Water and damp proof
  • High compression ratio
  • Environmentally friendly
Thermal Conductivity W/mK 0.029 Prevents heat loss
Thermal Resistance sqm/W 0.85 Blocks out cold
Nominal Density Kg/m3 35 Weight of 1 cubic metre
Minimum / maximum compression strength KPa 300/400 A maximum of 35 metric tonnes can be placed on 1m2 without damage
Water penetration (96 hours) 0.00 Waterproof

Marmox Tile Backer Board


If you have a wooden sub-floor. You may be looking for our tile backer boards. Which have an XPS core with a cement coating either side. Which means they can be screwed down to a wooden sub-floor.

Additional information


6mm, 10mm, 20mm, 30mm


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