Leak behind shower tray running down wall best approach to seal

dunworth1 · 14-02-2024 11:47AM #1

I have a leak behind the shower tray and it is running down the behind the plaster to the room below.

I'm thinking of trying to fill the gap with as much tec7 as possible to seal it but i have discovered another issue i removed a small section of plaster beside the shower tray enough to get my finger into the space behind the tray and there is a black sealant (unknown type) in place already but it is not cured.(a large amount came out stuck to my fingers). i don't think its going to be possible to remove all of it before applying the tec7.

will the tec7 bond with this unknown sealant and cure?

an option I'm trying to avoid is having to cut out a section of the ceiling plasterboard below to get at the section from underneath. but i might have no choice

listermint · 14-02-2024 11:52AM

https://www.boards.ie/discussion/2058336125/leak-behind-shower-tray-running-down-wall-best-approach-to-seal

You have to cut the wall out tbh. That sounds like you've got a leak in a pipe behind the wall. No amount of sealant on the surface of the wall will stop this. The term is pissing in the wind.

Find the source ASAP as these things can cause thousands more in damage to subfloors.

dunworth1 · 14-02-2024 12:10PM

https://www.boards.ie/discussion/comment/121766250#Comment_121766250

yeah i kind of knew i had to cut it out. but was hoping for some miracle simple solution.

i'll cut out a the section below and hopefully its not a complete disaster inside.

listermint · 14-02-2024 12:25PM

https://www.boards.ie/discussion/comment/121766343#Comment_121766343

Don't take changes with this stuff rot and mould can be dangerous or extremely expensive

14-02-2024 12:29PM

You ask for best solution

Remove bottom row (at least) of tiles. Remove tray. Repair/replace any damaged wall. Use classi seal around the shower tray before fitting tray back in. Tile down to the tray and over to classi seal. Done right this will never leak. There isn't even any need for silicone on the surface.

GreeBo · 14-02-2024 03:09PM

I'd start by opening a hole into the ceiling to see whats going one.

Once this is open, get someone to spray the shower at the wall/tray joint while your head is in the new hole and confirm this is the problem.

You talk about "a gap"...where is this gap?

A picture would help!

Leak behind shower tray running down wall best approach to seal

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