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Design Dilemma
kellychoi

necessary to put thermal board under heating mat?

kellychoi
6 years ago
Hi all
I am going to put electric underfloor heating mat in existing kitchen area. There is water underfloor heating in kitchen extension area with screed on top connected to main boiler, and it’s levelled with existing concrete floor. All area will be tiled.

I wonder will I be ok not to put thermal board under heating mat in the existing area? If I put the thermal board down, I will need to raise the screed floor about 12-15mm(extension area) to level the floor before tiling. I really want to put the thermal board but my builder said I cannot raise the floor on the screed floor and then tile because I will lose the heating benefit due to the thickness of the screed in extension area. Then I will lose so much heat down to the concrete floor otherwise.

Comment (1)

  • PRO
    CMD Ceramics
    6 years ago

    Its more economical to use the thermal backer board but not essential. If it was my own home i would be happy not to use it.

    Also I just wanted to point out that if you are tiling over piped underfloor heating it is highly recommended to use an uncoupling membrane like schluter ditra matting to allow for the thermal expansion of the screed during hot and cold cycles.

    CMD Tiling Contractors London and Surrey

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