Bath Sealant Problems

I'm having constant issues with the sealant around my bath.

When I bought the house, it had not been sealed, the tiles had been grouted against the bath.

I took this out, cleaned and sealed. But the sealant keeps failing, going mouldy and we've previously had leaks in to the room below, it also seems to leak through the shower screen as well.

The tiles sit just over the bath at the tap end, where the problem is, and butt to the tiles at the other.

I need to remove the sealant again for the 4th time but need to know what I'm doing wrong.

I am removing all sealant, rubbing down with white spirit and weighted the bath last time to account for movement. Only a little water is getting behind, but the plasterboard is slightly damp so it needs sorting properly.


Asked by Lee on 4th Mar 2024
Expert Trade Answers
"First make sure you have removed all the old sealant, and cleaned both surfaces, if you are using white spirit, you will need to get all the white spirit off the surfaces,then dry them. Use CT1 or an equivalent to seal the bath, make sure you fill the bath up first."
Answered on 4th Mar 2024 - Member since Jan 2023 - report
"In this sort of situation the bath would need to be reinstalled, (and quite possibly the tiles above it). The reason for that is that when silicone keeps failing it indicates that there is too much movement. This movement could be in the bath legs, more likely the floorboarding, and occasionally even the joist(s). The bath needs to come out and necessary reinforcement to floor installed, then bath back in. If tiles also then need to be replaced so be it, that is going to help anyway."
Answered on 4th Mar 2024 - Member since Jul 2020 - report
"Firstly, ensure ALL old sealant is thoroughly removed and the area cleaned and prepared for new sealant.

Use a high quality sealant designed for bathrooms too, I would recommend CT1 Sealant"
Answered on 4th Mar 2024 - Member since Nov 2023 - report
"Hi we could take a look fir more contact details on appointment ar no cost"
Answered on 4th Mar 2024 - Member since Jan 2019 - report
"Hi, do you have sufficient air circulating in the bathroom? Window? Fan? Vents? Black mould using appears from condensation due to the lack of circulation."
Answered on 16th Mar 2024 - Member since Feb 2021 - report
"use Dow Corning sanitary sealant. remove all the sealant and clean with disinfectant. the trick with sealing the bath is you need to fill it with water. sounds like you maybe breaking the seal every time you fill the bath"
Answered on 22nd Jun 2024 - Member since Jan 2020 - report
"Hello. There are many silicones and silicone-like products on the market, so you used maybe a product that was not fully flexible(!), mould resistant etc. Before applying silicone again I would suggest fill the bathtub with water (at least half
of volume) than more if it is a light, acrylic bathtub. There may also be a problem with the movement of the wall. Just really many reasons. Regards and good luck."
Answered on 6th Mar 2024 - Member since Mar 2023 - report
"I've worked on these multiple times it's all about the process if done correctly will be fine with no leaks try stripping old out fill the bath with water silicone with full bath wait till cured remove water and the bath will rise the second seal between bath and tiles"
Answered on 24th May 2024 - Member since Jun 2023 - report
"It’s sound like the bath needs to be refitted and any damp plaster board replaced with waterproof board retailed and siliconed"
Answered on 13th Mar 2024 - Member since Jun 2020 - report
"First of all check for movements, if you have adjust the legs from bath.
Second of all don't use any sealant go for commercial one , true it's costing 24 £ one tube but believe me it's the best .
Try with sts flooring they have the best ones."
Answered on 8th Mar 2024 - Member since Feb 2024 - report
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