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Unread 07-25-2012, 04:55 PM   #1
Stockholmco
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discoloration of carrara marble in shower

So I have a shower in which I'm having discoloration in the tile due to moisture. I pored a custom pan with a pan liner and as you'll see the pics which are included, somehow moisture is discoloring the tile. I have 3 coats of Aqua Mix sealers choice gold, which was applied before any water has hit the tile. I checked my weep holes and they were clear. I see no cracks in the grout either. One thought water was getting through around drain and seeping up to those areas, however wouldn't all the tile from the drain up to wet areas be affected? Is it possible the marble is just too pourous in those areas? Any feedback would be greatly appreciated.
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Unread 07-25-2012, 05:14 PM   #2
Davestone
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Nothing you can do but replace the dark ones.We discovered years ago iron oxide and other minerals inherent in the stone causes this when water or thinset is applied.
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Unread 07-25-2012, 05:30 PM   #3
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To me it looks like the pan is holding water, although with the drain removed, that seems impossible.

Is there a pre-float in the shower?
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Unread 07-25-2012, 05:53 PM   #4
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Welcome, Christopher.

Is there a pre-slope, sloped mud bed or similar, under your pan liner? I think that may be what Tim wants to know but I can't be sure.
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Unread 07-25-2012, 07:50 PM   #5
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There is a pre slope under the liner, I can see no way of water penetrating unless somehow from around the drain. As I mentioned before, wouldn't more tile be wet around the drain leading up to the wet tile?
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Unread 07-25-2012, 08:44 PM   #6
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Depends upon how well the pre-slope and liner were done, Christopher. You may have some "birdbath" areas where you're seeing the lingering wetness, or you may have had some serious wrinkles in your liner that did not get properly flattened. Might be water that would be happy to go through your weep holes if only it could get there, eh?

Or it may be something else.

My opinion; worth price charged.
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Unread 08-01-2012, 04:46 PM   #7
Stockholmco
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Patching a pan liner

Consensus on a shower pan is that there may be a small dip in the pre slope pour leading for moisture to discolor some Carrara marble. Is the only option tearing it all out to fix or can panliner be opened in problem area, correct depression and patch the area removed? Is that just a silly thought?
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Unread 08-01-2012, 05:13 PM   #8
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I have to assume that this is a traditional 40 mil liner, set between the preslope and the final slope. The preslope isn't as important as the final mudslope....BUT it certainly MUST drain properly to the weep holes. If it doesn't, you need to remove the liner and correct this.

I don't see any easy way to "open" this up and repair it. I would remove the liner, adjust the slope, put the liner back in and do the final mudbed....
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Unread 08-01-2012, 05:54 PM   #9
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Christopher, it'll help a lot if you'll keep all your questions on one thread so folks can see what you're working on and what's been previously asked and answered.

As you can see, not having the available history can cause confusion and duplication of previous Q&A, eh?

While it's probably not impossible to do what you're suggesting, I would certainly not recommend it.

My opinion; worth price charged.
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Unread 08-01-2012, 08:09 PM   #10
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Has the shower dried out at all since you've had the drain out? How long have you had the drain tore out?

I can't imagine how the water wouldn't be migrating out with a big hole in the middle of the shower.

In particular I can see dark (wet) areas in the mud around the drain. Has any of that lightened up?
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Unread 08-01-2012, 08:59 PM   #11
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Quote:
Originally Posted by Christopher
Consensus on a shower pan is that there may be a small dip in the pre slope pour leading for moisture to discolor some Carrara marble.
Small dip? Your photos do not indicate a small dip, looks like at least a couple square feet of discolored stone there.

Just a wild guess, but is the shower head at the bottom of your first photo? Has anyone investigated whether the liner is installed properly at the curb, where most of the moisture seems to be? How is the curb built; lath & mortar, backer board, other?
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Unread 08-02-2012, 07:58 AM   #12
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So everything has dried up fairly quickly. The dip is quite small however am wondering if weep holes weren't protected enough. The liner goes up at least 6" and over the curb. Probably will tear out down to liner and evaluate the slope under liner.
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Unread 08-02-2012, 08:10 AM   #13
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what about the weep holes in the bottom of the flange? maybe they r clogged with cement and the liner is holding water until it can get over the top of the flange.
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Unread 08-02-2012, 01:33 PM   #14
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Quote:
Originally Posted by me
How is the curb built; lath & mortar, backer board, other?
??

Now we know there's a liner at the curb. What's over the liner? How are the liner corners at the door opening done? Folded, cut & patched, other???
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Unread 08-04-2012, 08:10 AM   #15
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Christopher, I wouldn't do any demo yet. Could you post a couple photos of how well it has dried out?

You may be able to get by with a rather simple fix.
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