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Tiling

Tiler suggests not using insulated tile backer boards for eletric UFH

Komal 16/01/2026 - 7.57 AM

I have a mix of screed floor (insulated, concrete, then screed - new extension) and wooden subfloor. about 50/50. I want to have electric UFH in the living space aross both floors - 15sq meters (not massive). as a secondary / feet warmer . I already have decent rads and the room gets warm. but with kids playing ,and for the cost of a mat, i'm happy to have the UFH rather than regret it in future. I asked the tiler today if i should buy the warmup branded tile backer boards - 6mm. He said that even if i do - he will still put them ontop of concrete backer boards, plus use adhesive so will raise the floor 18mm approx above areas where we only use concrete backer boards. He said they are not a replacement, especially on the wooden floor. How bad will it be to not use any insulated boards? Is he right to say this ? and is there anything else that can be done instead?

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4 Answers

R and B Tiling Contractors LTD

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Carshalton
We would prime both screed and wood floors with acrylic primer. Using a suitable sized notch trowel we would then stick the 6mm insulated boards down with screws and washers too. The UFH would go on top the boards and we would prefer to self level over the top with a 2 part latex for protection and straighten up the floor before tiling
Answered16 January 2026
2

Gem Ceramics

Rating: 5 out of 5
Kidderminster
You only require the warm up tile backer boards, you do not need both but S2 flexible adhesive must be used
Answered12 January 2026
0

Purcel Z Plumbing and Construction Limited

Rating: 4.7 out of 5
Chichester
Yes, he is 100% right about that.
Answered12 January 2026
0

Essex Tiling Solutions

Rating: 5 out of 5
Westcliff On Sea
The wood must be secure and then the insulation board should be fine to go over without cement board. Perhaps 10mm board if hes worried about 6mm but boards like jackoboard have good compression/lateral movement. Not as good as hardie backer but the wooden substrate should be made secure enough to take the insulation boards without issue.
Answered16 January 2026
0