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Discuss Decoupling membrane over ply in the Tiling Forum area at TilersForums.co.uk.

  1. linton1990

    linton1990 Member of Tilers Forums

    Location:
    Essex
    I know this kind of thing comes up all the time, but i cant find anywhere for this. In my kitchen i have a 16mm floorboard floor. When i tile bathrooms i remove the floor, board with 18mm ply, board with 9mm and durables the lot. My question is, i cant remove the floor and height is an issue due to a range cooker being level with worktops. So would it be ok to still board with 9mm ply and then membrane. Or would i be best to board with 12mm and not worry about the decoupling? Thanks in advanced
     
  2. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    BELFAST
    I can’t quite understand exactly what you mean.
     
    • Agree Agree x 1
  3. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    BELFAST
    Whatever you do make sure your floor is deflection free and structurally sound and if it’s on top of wood make sure it’s decoupled.
     
  4. linton1990

    linton1990 Member of Tilers Forums

    Location:
    Essex
    The floor is very sound. Sorry my question being, if i boarded with 12mm could i not bother with the membrane? Or would i be best to go with the 9mm ply and membrane.
     
  5. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    BELFAST
    Providing your joist spacings are adequate 18mm structural ply (tounge and grooved) will suffice but 22mm is better, with direct uncoupling on top.
    It doesn’t matter what thickness of overboarding you use, if it’s wood you will still have to uncouple. So long as the floor is stable and deflection free, if you decouple it it will be fine.
    There is no excuse nowadays for tiling on plywood when there are so many options available that are far superior and competively priced.
     
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