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Old 04-19-2010, 05:15 PM   #1
pdq
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Shower tub weep holes

Hi Tile Gurus,

Theoretical question here...

If the current recommendation for drop-in tubs with tiled shower walls is to caulk the horizontal joint between the tub edge and the bottom row of tiles, how does the water that collects behind the tiles escape? Even if you are using Kerdi, water still soaks into the grout and spreads into the mortar behind the tile, and gravity eventually pulls it behind the caulk joint.

I would believe you either need to leave holes in your caulk for the water to escape, or to grout part of that joint so that the grout will "breathe" out the water vapor. Judging from all the caulked tubs I've ever seen, water collects back there, breeds mold, and turns your caulk from white to black in a few months time.

Maybe the Caped Caulk Crusader will return to enlighten me...
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Old 04-19-2010, 07:05 PM   #2
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The mold you see is from using mastic over greenboard. On a typical properly constructed surround with concrete board, vapor barrier, thinset mortar I don't see any food for mold. The water that gets back there will evaporate out through the vertical grout lines.
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Old 04-20-2010, 07:04 PM   #3
Timalev
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Try Dilex tile trims by Schluter. it eliminates the need for caulk joints in horizontal and vertical applications. Bit more pricey than silicone but a much cleaner look for sure.

You are right about caulk, eventually it will always grow mold down there.
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Old 04-20-2010, 07:11 PM   #4
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I was under the impression that the weep holes should stay open. Had this conversation with another installer recently and he is adamant about it too.
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Old 04-20-2010, 07:38 PM   #5
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Great question, Payton. I have been caulking that joint for years and thinking the same thing. All manufactures drawings and TCNA specs show a "flexible sealant" there.

Masons get to put weep holes in the bpottom of their walls.

So what is rthe difference?

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Old 04-20-2010, 07:44 PM   #6
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I know gueuze I have always wanted to put pieces of rope in there but the homeowners never jump at the idea. LOL. Seriously though I once did a surrond on a sterling tub that actually had weep hole/channels. The other 90 tubs that I have done haven't.

And I have yet to find a properly constructed surround with silicone sealant that was moldy. They are always mastic, sheetrock, and acrylic caulk.
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Old 04-20-2010, 08:06 PM   #7
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Well, then I guess I'm safe.

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Old 04-21-2010, 07:46 AM   #8
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Wink

space out bar staws or hemp twine to act as weeps.
I know some old timers who used to use hemp rope on decks to help drain the water as well as in mud showers.
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