Weeping cracks where the shower wall meets the floor

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New Member
Sep 14, 2023
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Our basement bathroom/shower was installed 10 years ago when our basement was finished. There are thin cracks along the bottom of the shower walls where they meet the shower floor tile. I now know that they should have used caulk instead of grout at that point and I plan to seal the crack with silicone caulk.

To prep, I left that shower alone for 48 hours to dry out. But when I checked today the cracks at the base of the wall were still moist. I pressed some tissue along the cracks to wick out the water and came back an hour later to find the tissues completely soaked. I repeated the process 7-8 times today and got less water each time until nothing more came out. I am surprised at how much water had been hiding in these cracks for 2 days. I don't think it was leaking anywhere. I know they used backer board because it is visible from the boiler room. But I don't want any moisture behind the new caulk. Any suggestions on how to make sure all the moisture back there is gone before I caulk?

I have thought about spraying some rubbing alcohol along the crack and letting that get absorbed and then evaporate. And, once it is dry, I might squirt some thin superglue into the crack and let that get absorbed into the space where the water has been going. I have some super glue that is the same consistency as water. But first the moisture needs to be gone.


Well-Known Member
Sep 30, 2006
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If the shower walls are grouted tile, the moisture could be transitioning thru the grout and migrating to the floor. Grout needs to b e sealed and occasionally resealed as chemicals used in cleaning will deteriorate the sealer.

Silicone, in my opinion, works best 20' deep in a landfill, unopened.

There unhanded grouts that are modified, or you can add a vinyl modifier to make a water resistant filler.