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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorandyman99
    • CommentTimeMar 14th 2019
    Installation instructions for my stone resin shower tray mandate fitting on a mortar mix even if fitting onto a suspended wooden floor. Any thoughts? I'd rather not if there is an alternative. The underside of the tray is completely flat and its incredibly heavy.
    Posted By: andyman99Installation instructions for my stone resin shower tray mandate fitting on a mortar mix even if fitting onto a suspended wooden floor. Any thoughts? I'd rather not if there is an alternative.

    Not if you want the guarantee to be valid.
    • CommentTimeMar 14th 2019 edited
    Posted By: andyman99Any thoughts? I'd rather not if there is an alternative.

    What's your objection? It sounds quite normal.
    • CommentAuthortony
    • CommentTimeMar 14th 2019
    By far the most crucial thing about fitting a shower tray is that the tray MUST have upstands.
    • CommentAuthorandyman99
    • CommentTimeMar 14th 2019
    Well my concerns are:

    1/ the flooring is OSB and that doesn't really like getting too wet
    2/ it's currently a pretty flat surface anyway
    3/ the tray is so heavy that I can imagine it wont be that easy to neatly it it on the mortar without making things worse.

    But if there's no real alternative then I'll just do it, I was just checking to see if there was an "easier" way.

    I'm using mermaid panels with a base transeal system for the enclosure.
    I suspect that the idea of setting it on/in mortar is to relieve any pressure points that may be there due to either unevenness in the floor or the base of the shower tray or both so probably worth doing.
    • CommentAuthorowlman
    • CommentTimeMar 14th 2019
    Use a flexible floor adhesive, the sort used for wood flooring. You can buy many of them in "foil sausages" a couple should be enough for a shower tray, They are a quite thick and you'll be able to apply a continuous thick bead over the whole area.
    • CommentAuthorDarylP
    • CommentTimeMar 15th 2019
    yep, flexible tile adhesive, combed 5mm ;-)
    • CommentAuthorandyman99
    • CommentTimeMar 16th 2019
    thanks all, I knew someone would come up with an alternative way!
    • CommentAuthorJeff B
    • CommentTimeMar 16th 2019
    We have a very heavy stone resin shower tray too. It's just sitting on the adjustable feet that were supplied and has been fine for 11 years so far. Admittedly it is on a tiled, concrete floor.
    We were told to just treat ours like a large, heavy tile and to try to ensure there were no cavities underneath.
    • CommentAuthorandyman99
    • CommentTimeMar 19th 2019
    I do understand the manufacturers concerns. The tray is very thin in parts, specifically where it drains to, which in my case in the middle. I now see they do an alternate design that drains to one end. This would have been a better choice since this part could be positioned at the shower end where it would be less likely to get direct loading. You always find these things out too late. I've also had to cut a small gulley to allow fitting of the waste pipe so I'm going to slide some metal sheet over this gap as the tray is lowered. Will use flexible adhesive, 6mm notches.
    • CommentAuthorCWatters
    • CommentTimeMar 20th 2019 edited
    Our bathroom floor is beam and block with insulation and UFH in screed. We actually omitted the insulation, UFH and screed under the tray, replacing it with a timber frame and WBP to make the waste pipe run easier.

    Pipework to the trap was designed and installed so the trap could move sideways slightly. Mortar laid on WBP. Tray lowered onto the mortar and top part of trap fitted temporarily through hole into lower part in floor. Later top part of trap partly unscrewed and silicon applied to seal.

    Before you fit tray, make sure the underside of tray is flat and clean where the trap will seal against it.
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