Tanking on skimmed plaster?

Discussion in 'Tilers' Talk' started by Galaxy99, Aug 26, 2018.

  1. Galaxy99

    Galaxy99 New Member

    Hi everyone

    I’m in the process of installing a new bathroom, with a shower cubicle in one corner. All the walls have been skimmed onto fireline plasterboard.

    Is it still possible to tank the shower area on top of the new skimmed plaster? Or should I have done it before.

    The full bathroom will be tiled.

    All help will be appreciated.
  2. rogerk101

    rogerk101 Well-Known Member

    If the plaster is sound and likely not to shrink or flake off then no problem ... tank away. I would certainly use tanking matting in all corners and edges. Use the recommended tanking primer, then at least 2 coats of tanking applied with brushstrokes at right angles to each other. Tile when dry.
  3. Galaxy99

    Galaxy99 New Member

    Thanks Rogerk101

    It’s newly been skimmed, when you say flake or shrink. Is this something that is common?
  4. LEH

    LEH Active Member

    Hi, are you aware of the weight limit for tiles on plaster skim?
  5. Galaxy99

    Galaxy99 New Member

    Hi LEH

    No idea, never got into that kind of detail. My other bathroom is fully tiled too, never had issues.

    Are you suggesting it’s best to tile straight onto plasterboard?
  6. LEH

    LEH Active Member

  7. Galaxy99

    Galaxy99 New Member

    Thanks LEH

    That link is great bit of info, and yes I was planning to use porcelain tiles. Reading that link I may now have to consider using pvc t&g aqua boards instead. (I’ve noticed there’s plenty of designs and colours to choose from) it will also take away any risk of water penetrating through the grout on tiles.

  8. rogerk101

    rogerk101 Well-Known Member

    That's why grout sealer was invented. Apply at least two coats, and the grout is effectively waterproof.

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