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

Shower tray nonsense

Discussion in 'Tiling' started by Aaron Cabrele, 3 Jun 2018.

  1. Aaron Cabrele

    Aaron Cabrele

    Joined:
    21 Feb 2017
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    hoping I’ll get sing replies to this one in tiling since I’m guessing a lot of tilers have had to fit trays.

    A couple of days ago I laid a 1200x800 Stone resin shower tray, the flopping heavy type. It went on a completely level 25mm ply base screwed to joists. My instinct was to lay it on construction adhesive since no levelling was needed, or tile adhesive, but I was a good boy and did exactly as the MI said on a 5-1 mortar mix.

    Since then I’ve put the no more ply boards on the edges but not yet finished the walls (which will be Beton Cire, a waxed concrete).

    Coming today back to the tray I’ve noticed the mortar is very crumbly, the bits splodged on the edge etc you can crush in your hand.

    I’m now worried over time and with the small movement of a timber floor it’s going to crumble away underneath and eventually fail.

    I wish I had gone with my gut instinct and used flexi tile adhesive. To pull it out now will be a bit of a nightmare but possible. Am I worrying about nothing?
     
  2. Sponsored Links
  3. gcol

    gcol

    Joined:
    22 Sep 2005
    Messages:
    6,593
    Thanks Received:
    68
    Location:
    Preston, Lancashire
    Country:
    United Kingdom
    Did you seal the surface prior to laying the mortar?
     
  4. foxhole

    foxhole

    Joined:
    14 Mar 2006
    Messages:
    17,508
    Thanks Received:
    2,008
    Location:
    Kent
    Country:
    United Kingdom
    Why do you require replies to be sung?


    You can always crumble splashes of mortar no matter how strong the mix, the main lump should be fine.
     
  5. Aaron Cabrele

    Aaron Cabrele

    Joined:
    21 Feb 2017
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    Hehe, I just like the sound of your singing voice. Thanks for the replies.

    No actually I didn’t seal the ply. I re read the instructions and it doesn’t mention it, just 18mm ply minimum. I’ve just noticed in the “materials required” it mentions an anti crumbling additive, however it doesn’t mention it in the step by step so I didn’t do that.

    My father in law came over (builder back in the day) and said the mix looked fine to him. My opinion of crumbly might be over critical.

    If it does fail somehow in years to come the only real extra work is going be taking the shower enclosure back out which won’t be too difficult, so I’ll leave it and see how it goes.

    I don’t understand the logic of needing a full mortar layer when these things can be supported by a handful of plastic legs as an option, with unsupported spans therefor able to take the weight of a person standing on it.
     
  6. gcol

    gcol

    Joined:
    22 Sep 2005
    Messages:
    6,593
    Thanks Received:
    68
    Location:
    Preston, Lancashire
    Country:
    United Kingdom
    The mortar is to even out forces on the tray. The tray will not necessarily be pefectly flat so if you just sit it on ply it’ll likely crack.
    Sound like the ply has wicked moisture out of the mortar mix and it’s gone dry. Guess the question is.... do you feel lucky?
    Probably be alright. Go have a beer and try not to worry. Just remember to tiptoe into the shower. :)
     
  7. flameport

    flameport

    Joined:
    10 Mar 2007
    Messages:
    9,562
    Thanks Received:
    1,888
    Location:
    Poole, Dorset
    Country:
    United Kingdom
    It's the difference between will not crack, and might crack.
    Particularly when objects are dropped onto the tray, not from just standing on it.
    Likely things to be dropped from a height include the shower head, bottles of shampoo, etc.

    Plastic legs also mean a huge step to get into the shower, and as plastic flexes and bends, leaks around the edge of the tray are likely.
     
  8. Aaron Cabrele

    Aaron Cabrele

    Joined:
    21 Feb 2017
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    Does that mean all trays installed on legs (and approved by MI) come under the “might crack” category?!
     
  9. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  10. Sponsored Links
Loading...

Share This Page