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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.

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    • CommentAuthoradam_w
    • CommentTimeMay 10th 2019
    Good afternoon all,

    I'm looking for some experienced advice regarding the installation and sealing of my shower tray.

    I'm looking to either tank the walls or install a fit for purpose membrane under the tiles but I'm concerned about the junction between the shower tray and the walls. There are all types of fillets, tapes and trims on the market but I was wondering if any of you had some experience with any in particular? The one top of my list at the moment is mapei tanking and Mira tile upstand strip, any thought or opinions would be appreciated!

    Kind regards,

    • CommentAuthorowlman
    • CommentTimeMay 10th 2019 edited
    Personally Adam, I'd make sure the area below and up the walls a bit, especially floor/wall junction, are suitably waterproofed "before" you install. Sh...t happens and its wise to do a bit of protecting just in case.

    As it's a new tray and for a Rolls Royce job you could possibly bond an upstand to the wall side/s of the tray, e.g. a 2-3 inch strip of plastic or GRP depending on the tray material. This would then be hidden when you tile over, sealing the back of the first row of tiles onto the upstand with silicone to prevent any capillary action.

    On my own tray I did the first bit, but because I used a sheet type shower liner I used their own tray/wall and corner seals together with very carefully applied sealant.

    P.S. Make sure the floor is good and rigid first, if suspended, and there will be no give in the tray.
    • CommentAuthortony
    • CommentTimeMay 10th 2019
    The only shower tray I would ever fit has to have upstands - fail safe, no reliance on sealants

    Shower panels complete the failsafeness - never ever can leak
    • CommentAuthorborpin
    • CommentTimeMay 11th 2019
    First thing, get a set of these Fugi for the silicone, they are brilliant. https://www.amazon.co.uk/Cramer-Grouting-Silicone-Profiling-Applicator/dp/B07H8K5W8D/

    If the shower base you want does not have upstands, my method is to always seal the shower base to the wall before tiling or putting panel up. You can dump as much silicone in as you like in and the final finish doesn't really matter (and spread a bit on the wall).

    If tiling, work the grout in really well. A friend of mine pointed out to me years ago that if the grout is runny enough and forced in properly, it seeps under the tiles into the adhesive grooves and never moves anywhere. Never grout on the same day you tile! Don't grout at the bottom of the tiles (you can seal first). Run some sealant over the grout in the corners and at the bottom (if not already done).

    Not had a shower fail on me yet (though that is tempting fate)...
    • CommentAuthoradam_w
    • CommentTimeMay 12th 2019
    Morning all,

    Thanks for the words of advice. I think the idea of an upstand would be the ideal solution but these only seem to be available on all 4 sides which doesnt look great.

    I like the idea of silicone between the tray and wall but I'd be concerned about shrinkage and how well the tanking would stick to it, I wonder if an adhesive may be a better option, something like grip fill?

    The other option would be a rubber adhesive backed upstand like the one I suggested in my initial message but again I'd have reservations about the corner detail as the wall as square and the tray would have a small radius on it.

    I have considered the option of a wetroom tray which would resolve all these issues but it's quite a bit more expensive. I appreciate that a shower tray isn't the ideal solution but whatever detail I agree on, I'll use on the bath as well and with small children, the walls are likely to get just as wet as the shower!

    Thanks again for all your advice,

    • CommentAuthortony
    • CommentTimeMay 13th 2019
    Upstands 100% guarantee no leeks from shower door
    • CommentAuthoradam_w
    • CommentTimeMay 13th 2019
    Hi Tony,

    This is for a walk in shower so no door.

    I've found that Schluter have a solution called the kerdi-ts which is to solve exactly the scenario I'm facing so rather than come up with my own solution, I'm probably best going with their off the shelf products, its not cheap though but still cheaper than retiling and a new ceiling downstairs!

    Thanks again,

    • CommentAuthortony
    • CommentTimeMay 13th 2019
    I always do wetroom floor laid to falls into a floor gulley, turn the up behind the shower wall panels again 100% failsafe
    • CommentAuthoradam_w
    • CommentTimeMay 14th 2019
    Tony - you make a good argument, I guess an extra £200 now for piece of mind is a bargain really, its just a shame all of this comes towards the end of the project when money is tighter. Thanks for your advice, it really helps ease the guilt of spending that extra cash
    • CommentAuthorowlman
    • CommentTimeMay 14th 2019
    I agree with tony regarding wall panels generally, I've used them in my own bathroom but they have two main faults.
    One: they will restrict you regarding colour and finish, they are only a melamine or laminate coating on a ply or MDF backing after all, and if your new bathroom is a beautiful design statement they could spoil the look.
    Two: they are only as good as the trims, corner and floor etc., they come in different materials, some are all plastic and some are anodized alloy, if you go down that route check the trims out too.

    You can get similar "sheet material" protection by using extra large format tiles. If for instance your bathroom was being tiled using porcelain then some such tiles come in different formats right up to 8' x 4' and larger.
    If you used real stone tiles e.g. limestone then again by using a large format and laying it horizontal, brick bond, you could at least get that continuous good seal at the bottom against the tray which is where most troubles start.
    • CommentTimeMay 14th 2019
    Posted By: owlmanthey are only a melamine or laminate coating on a ply or MDF backing

    The ones I used are on an XPS backing, so cannot rot. There are no trims; the panels are glued together and at corners, and free edges have a rolled, sealed edge. They are Nuance.
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