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Unread 08-29-2012, 04:15 PM   #1
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carrara marble darkens in shower wall

carrera marble was installed on cement Wonderboard with thinset, 2 inch careera marble on shower floor. installer closed the drain weep holes. Now when shower water gets through the grout between the wall tiles, careera marble turns it grey and floor turns dark where water falls. Installer then put on silicone sealer on floor and then epoxy on floor grout. still turns dark due to water. Now with industrial heat lamp floor will not dry out! Is there any way to fix or does this have to be ripped out? Much aloha and thanks to anyone. Pat

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Unread 08-29-2012, 04:58 PM   #2
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Welcome to the forum.

The fastest easiest way to stop the marble from turning dark is to stop using the shower and start using it as a closet. Marble is a very soft and porous stone. Sealant isn't waterproof. Yes, the marble looks very pretty, but it comes with some inherent features, one of which is water absorption. Scratching, soap sucm build up and getting dulled from acidic cleaners are other fun assets to natural marble in a shower.

If this really upsets you, start looking at a tile that looks just like marble, of which there are a few such as this shower we just finished.

While we're at it, what was the waterproofing method used on your shower? None of the componants listed so far is waterproof.

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Unread 08-29-2012, 04:59 PM   #3
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Welcome, Pat.

If you know the problem is caused by the weep holes being plugged, it's possible to correct that without a complete shower replacement. We'd need to know a good deal more about your shower construction, though, such as whether you have a pre-slope under the pan liner, what drain was used, what kind of material was used for the final shower floor, etc.

If you'll put your geographic location in your User Profile for folks to see, we might have someone in your area who could help you evaluate the situation. Depending, of course, upon which island you stay live, eh?.

My opinion; worth price charged.

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Unread 08-29-2012, 05:00 PM   #4
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Blocked weep holes are a potential problem. Odds are, from the sound of things, that the liner may be flat on the floor as well. WIthout some more details on construction, it's hard to say.
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