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Discuss Hardiebacker under Insulation boards? in the Underfloor Heating Forum area at TilersForums.co.uk.

  1. Bathfix Bob

    Bathfix Bob Professional Tiler

    Hi Guys, in my current bathroom job its been a late decision to have an electric underfloor heating mat.

    Its 18mm chipboard well screwed down and I've bought, cut and laid 6mm Hardiebacker but not fixed or glued it yet.

    Shall i do away with the Hardie and just screw and glue 6mm insulation boards down or shall I glue and screw hardie as normal and then insulation board on top? I want to keep the hardie really but I suppose I can use it on my next job.

    Tiles will be porcelain.
     
  2. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    Get rid of the Hardie if the floor is sound.
     
    • Agree Agree x 1
  3. Stef

    Stef Professional Tiler

    Location:
    Cumnock, Ayrshire
    It will be fine to fit ufh on top of Hardie, not ideal as you would be better with thermal.
    Might not perform as efficiently but it will be pennies of an extra cost.
     
    • Like Like x 1
  4. Localtiler

    Localtiler Professional Tiler Top Contributor

    Location:
    Yorkshire
    Personally I would go over the hardie with the ufh
     
  5. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    I was under the impression Hardie was a terrible insulator hence it being specified for overboarding wet ufh sometimes
     
  6. Bathfix Bob

    Bathfix Bob Professional Tiler

    Thanks guys,

    It's seems some people love insulation boards and some hate them, my local independent tile shop dosnt sell them and whenever I ask they say theres no call for them as everyone tiles on Hardie.
    I have to go to the tile Giant in the next town if I need them.
    Can someone explain why it's okay to tile on something so soft like foam cored boards when we do everything we can to make floors rigid?
    The smaller the tiles the more likely they would 'sink' into the board.
     
  7. Ttt1601

    Ttt1601 Professional Tiler JOTM Winner

    You've kind of answer your own question there, it's about point loading those thermal boards are are bloody solid if you've got a large surface area on them, but hit them with a hammer you'll go through it
     
  8. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    If I'm correct most insulation board manufacturers are happy with a tile size down to 50mmx50mm although one of the ones that marmox make are happy to go slightly smaller I believe but you would have to check with them .
     
  9. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    Agree, although that may not be the case once latexed
     
  10. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    Please educate as to why
     
  11. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    The latex would spread the load and therefore cancel the point loading issues
     
  12. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    I was thinking you were talking of a decrease in point loading Tile size . Ie increase issues
     
  13. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    I mean you can use smaller tiles once latexed.
     
  14. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    Yes I got it . My reply confusingly worded
     
  15. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    We got there:)
     
    • Like Like x 1
  16. Bathfix Bob

    Bathfix Bob Professional Tiler

    Right this is good, I'm going to glue and screw down my Hardie, then UFH, SLC and tile.
    Thanks guts. ..
     
    • Like Like x 3
  17. Dan

    Dan TilersForums.co.uk Est.2006 Staff Member Top Contributor NOT a Tiler

    Location:
    Staffordshire, UK
    Order online. www.uheat.co.uk
     
    • Like Like x 1
    • Winner Winner x 1
    • Informative Informative x 1
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