1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Leaking shower cubicle - help

Discussion in 'Building' started by RrogerD, 29 Sep 2021.

  1. RrogerD

    RrogerD

    Joined:
    8 Jun 2013
    Messages:
    201
    Thanks Received:
    4
    Location:
    Gloucestershire
    Country:
    United Kingdom
    I'm after some tips & ideas on how to resolve this please.

    Built the shower cubicle of studwork, hardi-backer & 6" square tiles; single cold water supply inside of the studding, exiting to a 10.5kw electric shower; shallow tray sits on 22mm chipboard on the joists. Waste runs between joists and out.

    The whole lot has been up for approx 8 yrs and until recently, apart from a few hiccups, everything has been fine. I now have a leak and I'll be bug**ed if I can work out where it is coming from.

    The 'leak' appears below the tray in the corner, bottom right of where the shower unit sits. It is not coming from under the glass. It is adjacent to the bathroom door and there is water present in the doorway floor also. It is getting quite soaked and is starting to rot the adjacent boards.

    I've replaced the waste, thinking it may be leaking at this seal and running across the chipboard.
    I've sealed the glass / tray junction and, part way up the glass itself.
    I've sealed the tiles / tray junction all the way around.
    I've sealed the vertical corner between glass trim and tiles.
    I've sealed the vertical corner of tiles against tiles.
    I've had the shower unit off and squished sealant into the gap around the inlet pipe as it exits the tiles.
    I've tried pointing the shower head of different areas in turn to try and determine where the leak is, but this is inconclusive.

    I'm beginning to think that it may be leaking through the grout, although there is nothing visible. No discolouration. Also, is this really likely?
    Could it be the supply pipe leaking inside the stud wall? Again, no sign of damp on the outside plaster.
    Could it be the supply pipe leaking at it's 90deg bend fitting and leaking down between tiles and hardi-backer?

    Where do I go now?

    What do I start ripping off first and when do I stop?

    I really don't want to be removing the whole shower enclosure and tiles and hardi-backer etc and starting all over.

    Any pointers anyone? Thanks
     
  2. Sponsored Links
  3. 23vc

    23vc

    Joined:
    17 Apr 2015
    Messages:
    2,525
    Thanks Received:
    399
    Location:
    Warwickshire
    Country:
    United Kingdom
    The tray-to-tile seal, specifically the bit that then gets hidden by the enclosure profile, is the key. I’ve even had it where the sharp corner of the enclosure when fitted, punctures the silicone. It’s a faff to sort out though as you need to remove the enclosure.
    The enclosure shouldn’t be sealed to the tray on the inside base, only on the outside.
     
  4. RrogerD

    RrogerD

    Joined:
    8 Jun 2013
    Messages:
    201
    Thanks Received:
    4
    Location:
    Gloucestershire
    Country:
    United Kingdom
    Thanks for taking the time to reply.

    I hear what you're saying but I've sealed everywhere (I thought) around that area; along both edges and up the corner. Also, up the glass adjacent to the trim, thinking that it may be leaking past this. And yes, inside the enclosure as well as outside.

    Mmmm. Just thinking as I write this, perhaps as you say this is the problem? Like a double-glazed window unit, the water will run down inside but is designed to leak out the front ie do not seal this bit. Perhaps this is what is happening here? Water may be running down into the enclosure and with nowhere to go out into the tray, be running along inside and out the end?
     
  5. denso13

    denso13

    Joined:
    22 Jan 2007
    Messages:
    5,619
    Thanks Received:
    1,117
    Country:
    United Kingdom
    As above, likely to be the tray to tile seal behind the vertical profile. You can't seal this again without removing the door/enclosure as there is no way to access it with the enclosure in place.
     
  6. 23vc

    23vc

    Joined:
    17 Apr 2015
    Messages:
    2,525
    Thanks Received:
    399
    Location:
    Warwickshire
    Country:
    United Kingdom
    The base, between enclosure and tray, is the bit that deffo shouldn’t be sealed on the inside, otherwise it’ll trap water. Up the sides is ok but not the base. So yeah that may be the issue if you’re confident the rest is ok
     
  7. KenGMac

    KenGMac

    Joined:
    24 Aug 2010
    Messages:
    3,852
    Thanks Received:
    746
    Location:
    Ayrshire
    Country:
    United Kingdom
    The tray itself may be leaking? but difficult to spot, get a bright torch, do not shine the light directly at the tray, place the torch in the tray, so the light is playing over the surface of the tray base, switched on and look for hairline cracks.

    In the O/Post it is mentioned that the flooring outside the shower is rotting? that would indicate a very long term small persistent leak.

    Ken
     
    • Thanks Thanks x 1
  8. RrogerD

    RrogerD

    Joined:
    8 Jun 2013
    Messages:
    201
    Thanks Received:
    4
    Location:
    Gloucestershire
    Country:
    United Kingdom
    Thanks everyone.
    I haven't had a chance to get and have another look but just wanted to chip in here to say thanks in the meantime.
     
  9. Sponsored Links
Loading...

Share This Page