On 02/05/2019 10:45, Lee Nowell wrote:
Hi All

I am fitting a shower at the weekend in a new bathroom. There is a
shower tray and one side the wall is an external plastered/ rendered
and the other is a stud wall with hardieback boards on it. Both
walls will be tiled.

When we have done this before I have masticed the tray to the wall,
sealed it from above and then tiles on top and finally sealing the
gap between the tiles and the tray. For the tiling used waterproof
adhesive and grout.

I have also done similar, and always had good results doing this. In
reality if you are properly sealing all the gaps and board joints etc
before tiling, as well as taping the board joins, then that *is* getting
pretty close to tanking anyway.

Having said that I have usually used waterproof backings to tile onto.
In the past I have rendered the walls adjacent to showers (with SBR
admix). More recently I used aquapanel, which seemed to work well.

Someone has told us we should really "tank" it but TBH not sure what
this means in this context and indeed whether this is needed / better
than my usual approach.

Its usually a process of sealing all the gaps, taping all the joins, and
then painting with a water proofing finish that remains slight flexible,
prior to tiling.

Companies like Mapei do complete kits of it with enough content for a
typical shower. e.g:

https://www.screwfix.com/p/mapei-sho...fing-kit/78484


--
Cheers,

John.

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