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Old 02-04-2016, 08:56 PM   #31
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The TCNA is the bible on how to build a shower and references lots of ANSI standards. Over a plywood base, to hold together, the preslope needs to be a moderate amount thick. Now, You might be able to use one of the waterproofing 'hats' and do a divot method, which might let you hold things off some from the drain and keep it thick enough (there's a procedure for that in the handbook, but might not quite apply here). You should insist on a shower that meets industry standards which apparently isn't the same as local norm!

Lots of showers built incorrectly, it's not hard to do it right according to one of the selected standards, but it is quite detail oriented, and you need to dot all of the i's and cross all of the t's for it to work properly. Skipping a step or winging it just is asking for failure, or at the minimum, poor performance.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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Old 09-03-2017, 07:54 AM   #32
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Resurrecting this thread...new issue

Well, about a year and a half after our shower floor redo, there is a hairline crack in the grout leading toward the drain. Hard to tell exactly where it stops, but it appears to be about a foot in length. Is this something I need to worry about? Am I going to have to call these people back out here to fix it again?? �� I just checked under the house to see if it leaking and I can't tell for sure. The area around the drain that leaked before seems dry, but there is another wet-looking spot in the subfloor that does feel slightly damp.

Last edited by Kendrav; 09-03-2017 at 08:46 AM. Reason: Additional info
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Old 09-03-2017, 10:37 AM   #33
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Yes, I would get them back out to fix it. Tiles cracking on a shower floor usually means the plywood is getting wet and swelling.

I'm not trying to cause you to worry but small leaks can cause a lot of damage over time. About 15 years ago I got a call about one of my showers that suddenly had a crack in the shower floor. The shower was 3-4 years old at the time. Ended up being a plumbing leak in the pipe behind the shower head. It only leaked when the shower was running. In just a few years it ended up doing 30k in damage.

Sounds like yours isn't leaking as bad as mine was but I would still get it checked.

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Old 09-11-2017, 09:45 AM   #34
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Leaking shower clarification please

We suspected our shower was leaking into our crawl space but we weren't 100% positive, so we stopped the drain and let the shower floor fill with water about 1-2 inches up the wall. We let it sit like that for a couple hours and then checked the crawl space. There was water dripping through the subfloor everywhere, not only under the shower, but throughout the bathroom.

When the owner of the company came out to look at it, he said "well if you flood the pan, of course it is going to leak."

Am I crazy? Water is not supposed to drip out through the subfloor no matter how much water is in the shower, correct??


If you'd like the history behind our shower issues,, please see this post:

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Old 09-11-2017, 09:51 AM   #35
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That would be correct.

The guy clearly knows nothing about proper shower construction. Code compliance inspectors generally require such a flood test of a site-built shower receptor before construction can continue on the shower. It should never leak.

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Old 09-11-2017, 11:08 AM   #36
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What CX and Davy said. I had a guy who didn't want to repair a leaky second floor shower. He said he would fix it when it came through the ceiling. Years later much to his chagrin, it actually did come through the ceiling.
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