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Shower floor waterproofing sealant?

Posted on 4/12/25 at 5:27 pm
Posted by Sheepdog1833
Member since Feb 2019
732 posts
Posted on 4/12/25 at 5:27 pm
I have a stone small tile shower floor.
I’ve recently discovered that it is leaking from somewhere in the shower into my neighboring bedroom. I’m positive it is not coming from the drain pipe.

Is there a clear sealant that I can put on the tile instead of ripping out the entire floor pan to waterproof it?
Posted by mtcheral
BR
Member since Oct 2008
2034 posts
Posted on 4/12/25 at 6:48 pm to
They make sealant sprays but good luck. Tried that with mine but if it’s leaking through that means your shower pan isn’t holding correctly and you will likely need to rip it out and redo like I did.
Posted by 9rocket
Member since Sep 2020
1414 posts
Posted on 4/13/25 at 4:40 am to
Yep, it’s gotta come out and be redone properly.
Posted by PaBon
UPT 17th W/D
Member since Sep 2014
2069 posts
Posted on 4/13/25 at 7:35 am to
Are you on a slab?

You can regrout it and recall the horizontal and vertical joints with grout caulk for starters.

If that’s doesn’t work, you’ll have to redo it. The damage is probably worse than you think underneath.
Posted by GeauxldMember
Member since Nov 2003
4951 posts
Posted on 4/13/25 at 6:25 pm to
The real waterproofing in a shower takes place beneath the tile, whether it’s a mud bed, liner, shower pan. If the shower is leaking, no sealant, grout, etc is going to fix it. This usually results from a faulty installation The tile needs to come out and the shower has to be re-done correctly. Don’t put it off, or it’s going to cause much more extensive damage.
Posted by Sheepdog1833
Member since Feb 2019
732 posts
Posted on 4/13/25 at 7:13 pm to
Thanks all.

Can anyone forward me a YouTube that has the correct procedure. I’ve seen so many that I’m not sure which route to go.
Posted by mtcheral
BR
Member since Oct 2008
2034 posts
Posted on 4/13/25 at 8:30 pm to
Not sure what you mean but the correct procedure is to call a tile guy that can redo it correctly for you. Maybe demo it down to studs yourself and then call the tile guy.
Posted by Maniac979
The Great State of Texas
Member since Jan 2012
1955 posts
Posted on 4/13/25 at 8:51 pm to


Here is a good place to start.
Posted by skidry
Member since Jul 2009
3430 posts
Posted on 4/14/25 at 6:18 am to
Rip it out yourself and start o er with shluter kerdi.

I had this problem and found that the installer stapled the pan corners to the wall studs. That’s all it took. Ruined the whole sub floor of the bathroom and into the bordering rooms on my pier and beam house.
Posted by GeauxldMember
Member since Nov 2003
4951 posts
Posted on 4/14/25 at 7:46 am to
There are many methods that can all be effective. Do some research and decide which one you want to go with. There are some good channels on YouTube by Sal Diblasi and Tile Coach that can help educate you on those methods.

Posted by Sheepdog1833
Member since Feb 2019
732 posts
Posted on 4/14/25 at 8:06 am to
Is it possible to just do the floor/pan? Instead of going up the wall?
I am on slab for reference.
frick!
Posted by GeauxldMember
Member since Nov 2003
4951 posts
Posted on 4/14/25 at 8:25 am to
I wouldn’t advise that. The entire system gets integrated to the pan to make it all waterproof. Not great news, I get it, but don’t compound the damage.
Posted by cberni1
Metry
Member since Jun 2012
539 posts
Posted on 4/14/25 at 8:41 am to
Check out Tile Coach on YouTube. Almost every video he posts is your exact scenario and he explains how and why this happens. He also usually explains what it will take to fix it but doesn’t show the entire process of redoing the work. That said, between tile coach, bathroom remodeling teacher and home renovision DIY channels, you should have alot of information to fix this.
Posted by Bamafig
Member since Nov 2018
4699 posts
Posted on 4/14/25 at 11:30 am to
StarrTile on YouTube is excellent. He has several videos addressing your very issue.
Posted by Cage Fighter Trainee
Member since Aug 2024
106 posts
Posted on 4/14/25 at 3:56 pm to
Like others have said, your tile shower needs to come out to properly repair the shower/shower pan. With that said, it may be covered by your homeowner's policy. Some insurance carriers will want to see damage to extend coverage and others will extend coverage if you just had to clean up water that leaked. Often times base trim, walls and/or floors will be damaged in adjacent rooms.

Additionally, while the insurance company won't pay for the failed shower pan, they can (depending on policy language) pay for access to the shower pan which would include replacement of the tile, nook, tile feature strip, resetting or replacing shower glass, resetting fixtures, etc.

Keep in mind you are responsible for your deductible and this is one of the worst types of claims you can file as your rates WILL increase (up to 30%). Some policies include language that excludes water damage if leaking for more than 14 days so be sure you know how long the leak has been ongoing.

Just some food for thought as this can be a big unexpected expense.
Posted by Spankum
Miss-sippi
Member since Jan 2007
58299 posts
Posted on 4/14/25 at 6:24 pm to
quote:

Here is a good place to start



I found this video oddly satisfying to watch!
Posted by 9rocket
Member since Sep 2020
1414 posts
Posted on 4/14/25 at 7:15 pm to
No. The pan goes up the wall. Supposed to be at least 3” higher than the curb. You gotta go up the wall a couple rows of tile, at least. Even then, there is really no good way to tie that into the existing waterproofing. You will also have the problem of matching those couple rows of tile with the existing tile. Even the same tile with different batch numbers can show a difference in color, sheen, and even size. Especially if it’s olde4 than about two years, which is the shelf life of tile at the tile store.
You’d be much better off ripping the whole thing out and having a reputable shower builder install a new one. Best to ask for references. Too many jacklegs tell you they can build a shower when in actuality they can’t.
Or you could build it yourself with the help of YouTube or the John Bridge Tile Forum. There are guys on there that are willing to walk you through the process, step by step.
Posted by LSUDad
Still on the move
Member since May 2004
60601 posts
Posted on 4/15/25 at 10:44 pm to
Location?
Posted by tigerfoot
Alexandria
Member since Sep 2006
58906 posts
Posted on 4/16/25 at 12:44 pm to
quote:

had this problem and found that the installer stapled the pan corners to the wall studs
Hope he doesnt build boats on the side.
Posted by 9rocket
Member since Sep 2020
1414 posts
Posted on 4/16/25 at 5:38 pm to
quote:

the installer stapled the pan corners to the wall studs


Happens a lot more than one would think.
Everybody can be an installer, now, thanks to Schluter making their kerdi so user friendly. Almost impossible to screw it up.
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