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Discuss Can I use hardwall as a backing to tile onto. I've been told by many u can and u can't. Many thanks in the Tiling Forum area at TilersForums.co.uk.

  1. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    Can I use hardwall as a backing to tile onto. I've been told by many u can and u can't. Many thanks
     
  2. whitebeam

    whitebeam Moderator Staff Member Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Hertfordshire
    No you can't, it's not suitable like many other gypsum undercoats.
     
  3. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    Thistle dri coat would be advised
     
  4. whitebeam

    whitebeam Moderator Staff Member Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Hertfordshire
    Yes mate but like everything depends on your tile weights.
     
  5. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    I need to check the weights. It has said on the BG site that dri coat will take 20kg/m2. I know the tiles are not as heavy as that.
     
  6. 3_fall

    3_fall Administrator. Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    SW London
    Add 4/5kg for adhesive and grout too!
     
  7. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    Thank you very much for ur help.
     
  8. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    British gypsum say no as it is one part of a two part system
     
  9. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    I'm assuming I can tile onto multi finish then ??
     
  10. 3_fall

    3_fall Administrator. Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    SW London
    After it's fully dried and primed with acrylic primer, not pva!
     
  11. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    Spot on. Many thanks
     
  12. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    What's everyone's views on bedding shower trays on to ply wood with sand and cement.
     
  13. Localtiler

    Localtiler Professional Tiler Top Contributor

    Location:
    Yorkshire
    A Terrible idea! But it happens a lot. A tray will not bond to sand and cement and, neither will ply wood really
     
    • Like Like x 1
  14. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    I have been told alway use silicon to bed them down on. It's flexible and bonds to the tray and plywood. BUT......... Manufactures state sand and cement. Don't want to upset the warranty. But surely it's better to use silicon
     
  15. Localtiler

    Localtiler Professional Tiler Top Contributor

    Location:
    Yorkshire
    I don't fit shower trays but if I did I would use an s2 tile adhesive.
     
  16. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    I have a little issue ATM with one I'm fitting at the mo. .900wide 1800long. I bedded it on flex tile adhesive. Not 3 days later the tray is moving.
     
  17. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    If it has failed on Tile adhesive it would of failed on cement . We have had failures on silicone random crack in tray . We stick lots of trays with flexi Tile adhesive much like tiling you have to make sure you have good coverage
     
  18. Localtiler

    Localtiler Professional Tiler Top Contributor

    Location:
    Yorkshire
    I once had to re fit a tray that the plumber had stuck down with plasterboard adhesive
     
  19. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    There is very minimal movement in the ply wood. So I can't see it being this But maybe it is. It's very frustrating.
     
  20. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    If its moving I would think that would be your problem
     
  21. Localtiler

    Localtiler Professional Tiler Top Contributor

    Location:
    Yorkshire
    The bottom of the trays aren't usually a great surface to stick to hence using an s2 like ultimate that stick to all sorts of surfaces
     
  22. Alex111

    Alex111 Active Member

    Location:
    Marlborough
    It hasn't stuck at all. I lifted the tray up no prob. I don't think u can ever make a ply wood floor non moveable.
     
  23. whitebeam

    whitebeam Moderator Staff Member Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Hertfordshire
    BG change the goal posts to suit by the sound of it.
     
    • Like Like x 1
  24. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    I remember my chat with bg there was one under coat they would recommend but not hardwall . When I was trying to get an answer why it wasn't suitable and not just take because I said so I got accused of being aggressive.
     
    • Like Like x 1
  25. SJPurdy

    SJPurdy Professional Tiler

    Which undercoat do they recommend?
     
  26. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    That I can't remember you will have to call bg
     
    • Like Like x 1
  27. Deane

    Deane Active Member

    Location:
    WIMEREUX
    Light tile only is ok....seal it first..
     
  28. Deane

    Deane Active Member

    Location:
    WIMEREUX
    Bad bad idea...
     
  29. Bathfix Bob

    Bathfix Bob Professional Tiler

    The sand and cement isnt meant to glue the tray down its just to bed it down, if you come in the next day and start yanking corners up it will move.
    Think about the Mira flight leg kit...are the legs glued down?
     
  30. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    If you make a screed mix that is meant for 75mm plus so thin bedding under shower tray there should not really enough thickness for it to be strong enough . Have removed a few trays which were s+c bedded came away really easy. We always bed flexible tile adhesive , much better product to use at those thicknesses .
     
  31. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    Funny thing going slightly of topic . I know a plumber who had a cracked tray . Bedded without sufficient coverage so told by manufacturer his fault . This tray is also designed to sit on legs so far fewer points of contact compared to bedding on muck so how does that equate .
     
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