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Discuss 70m2 Floor, 2 substrates, Ditra and Hardie? in the Tiling Forum area at TilersForums.co.uk.

  1. clipboard2008

    clipboard2008 Active Member

    Hi

    I have a client who needs me to tile his kitchen. Part of it is caber floor T&G (original part of the house) the other part (extension) is sand and cement screed. The extension comes off the front and side of the house so the join between the timber and screed is in an L shape. There is also wet underfloor heating under all the floor.

    Tiles are 600x600 Porcelain

    How is the best way to stabilise this floor?
    The client doesn't want an expansion joint over the join in the 2 substrates as it would be in an L shape and ruin the look of the tiles

    Is it going to be a case of fixing Hardibacker across the whole floor, bridging the join then covering in ditra?
    Would this stabilise it enough to ensure no future cracking?

    TIA
     
  2. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    Biggest question is the caber floor floating or fixed to joists .
     
  3. clipboard2008

    clipboard2008 Active Member

    Fixed to joists, though there is some flex at joint between timber & screed
     
  4. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    That is the question, what is the underfloor heating system set up on the wood side ? If you are over boarding with hardie, you shouldn't need ditra, imo! But an anti fracture mat over the area where your bridging the two substrates wouldn't hurt.
     
  5. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    It's the flex at that point that will likely cause problems.
     
    • Creative Creative x 1
  6. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    If you can see it flexing you got problems possibly with the suitability of the timber floor for tiling . Just to be clear does it have ufh on timber floor .
     
  7. clipboard2008

    clipboard2008 Active Member

    UFH is under the caber flooring and is also in the screed.
    On the timber side it is polypipe laid in a metal tray then sand cement to top of the joists so heat transfers to caber flooring.
     
  8. Chris Gibbs

    Chris Gibbs Professional Tiler

    Location:
    North wales
    in my opinion don't use ditra... sorry, but it doesn't stick to the matting that well for me to have piece of mind. some may disagree, that's my opinion and experience. id go for a durabase dural matting...
     
    • Agree Agree x 1
  9. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    I think you need to set your tiles out in both directions that joint is on substrate change and use dural microjoint or coloured silicone instead of grout .
     
    • Like Like x 1
  10. Adey1980

    Adey1980 Professional Tiler

    Location:
    Caerphilly
    How big is the area with the caber floor? Is there a possibility of filling it in? To prevent any bounce as that is where your going to coma across with problems
     
    • Like Like x 1
  11. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner

    Location:
    BELFAST
    That would be my first thing to check.
     
  12. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner

    Location:
    BELFAST
    That is also an equally important consideration imo.
     
  13. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    How do you mean as there is ufh under timber . Do you mean take out floor and screed
     
  14. Adey1980

    Adey1980 Professional Tiler

    Location:
    Caerphilly
    Yes thatnis what I was trying to say but without pictures it’s hard to gauge, maybe pump a liquid screed ?
     
  15. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    It would be hard as you would have to get a Dpm in there . I would say remove flooring , joists and ufh before digging out then starting to put things back together .
     
    • Like Like x 1
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