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Discuss How much of the wall should I tank in the DIY Tiling Forum area at TilersForums.co.uk.

  1. monkjack

    monkjack Active Member

    Location:
    Aylesbury
    Hi all, I'm going to be fitting a new shower. I've read plenty of advice on kerdi vs liquid membrane etc etc, but one question I don't see being asked is how much of the wall should you do - lets say my bathroom is 3m by 3m and I'm putting in a 900mm Quadrant. How much of the two walls that touch would you waterproof - just the bit behind the shower and a "bit more" ? If so, can't the water go "around" the matting/membrane then?
     
  2. Plan Tec Tiling

    Plan Tec Tiling Administrator Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    Wimborne, Dorset
    Usually 300mm past shower area is just fine for most brands
     
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  3. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    BELFAST
    You should tank inside the wet zone(anywhere that may get wet) from floor to ceiling if using a tray, a wet room is a different matter.
     
    • Agree Agree x 2
    • Like Like x 1
  4. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    BELFAST
    You pipped me to it Geoff :)
     
    • Like Like x 1
  5. monkjack

    monkjack Active Member

    Location:
    Aylesbury
    Yeah it's a stone tray, not a wet room.
     
  6. monkjack

    monkjack Active Member

    Location:
    Aylesbury
    So what happens to any moisture that's caught. Does it just trickle down to the (now waterproof) floor and sit there until it evaporates?
     
  7. Plan Tec Tiling

    Plan Tec Tiling Administrator Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    Wimborne, Dorset
    You tank down onto the tray
     
  8. monkjack

    monkjack Active Member

    Location:
    Aylesbury
    Now I'm confused. I was under the impression I waterproof - walls and floor - then fit tray on it, tile down to the tray.
     
  9. macten

    macten Professional Tiler

    Location:
    Nottingham
    Moisture will just evaporate - If there's water trickling down behind your tiles then you've got problems!
     
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    • Useful Useful x 1
  10. Paul C.

    Paul C. Professional Tiler

    No. It should be tray in first then then the tape in the kit laps down on top, then the membrane goes over the tape, bridging the gap between the wall and the tray, preventing anything getting in between.
     
    • Agree Agree x 2
    • Like Like x 1
  11. Localtiler

    Localtiler Professional Tiler Top Contributor

    Location:
    Yorkshire
    I disagree Paul.
     
    • Informative Informative x 1
  12. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    BELFAST
    With what points Andy?
     
  13. Localtiler

    Localtiler Professional Tiler Top Contributor

    Location:
    Yorkshire
    I disagree that's the best way to tank a shower enclosure is to fit the tray and tank down to it. Surely the best way is to fully tank the wall to the floor, then fit the tray, silicone it well with a profile tool, then tile.
     
  14. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    BELFAST
    When tiling to a tray I prefer it fitted with Classi seal, silicone that to the wall, overlap it with tanking tape then also the verticals and paste the lot.
     
    • Like Like x 1
  15. monkjack

    monkjack Active Member

    Location:
    Aylesbury
    Thanks for the replies guys. Appreciate you all taking the time out to help idiots like me :)
     
  16. Localtiler

    Localtiler Professional Tiler Top Contributor

    Location:
    Yorkshire
    Imo the perfect way would be fully tank the wall to floor, obviously tape the corner, fit the tray and silicone, then apply butyl tape over lapping on to tray which will stick like you know what to the tray
     
    • Like Like x 2
  17. Paul C.

    Paul C. Professional Tiler

    Ok, see your point. So you are still taping down to the shower but painting the membrane beneath as well. Suppose it seems silly not to for the amount of membrane it will use, if for any reason the the tape/silicone fails. Point taken onboard :)
     
  18. charliesw4

    charliesw4 Active Member

    Location:
    East Sussex
    I like trays fitted using classi seal too (unless the plumber stretches the corner). Then silicone that to the wall and tanking tape over all internals, joins and the classi seal/tray. Then paste everywhere in the shower to the ceiling.
     
  19. macten

    macten Professional Tiler

    Location:
    Nottingham
    I usually only tank to chest height unless I'm feeling generous
     
  20. Tilerdurden

    Tilerdurden Professional Tiler

    Location:
    Scotland
    I concur
     
    • Like Like x 1
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