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Unread 01-27-2021, 07:29 PM   #1
greentruck
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RedGard over hot mop

Hello the tile installer is putting a new shower in. The pan is hot mopped with a mortar bed. The walls have been floated out with a tar paper and mortar. We will be installing white marble tile. The tile store is recommending that he redguard the shower walls and pan so that it reduces the risk of the marble color oxidizing or turning yellow. Will this idea work and is it okay? Thank you for all the help.
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Unread 01-27-2021, 09:14 PM   #2
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Welcome back, Sam.

I think the tile store has it just about backwards, but the only way to ensure that the white marble doesn't change color or suffer other ailments that happen with that kind of stone in a wet environment is to simply not install white marble stone in your shower. And especially not on the floor.

If I were threatened with serious bodily harm unless I installed that marble in that shower, I'd most definitely want to install mine directly onto the mud walls and the mud floor. See my warranty information below.

My opinion; worth price charged.
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Unread 01-27-2021, 10:31 PM   #3
greentruck
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Thanks cx for the reply. It sounds like white marble is a pita. The changing color was one of my concerns. The house has a water softener so I’m hoping that helps.
My biggest concern is that I have never heard of redguard over mortar in a hot mopped pan. I’m worried that this would lead to problems with moisture getting trapped somehow someway. I was going to call custom building products tomorrow and see what they have to say.
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Unread 01-27-2021, 10:36 PM   #4
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Sam, if you'll go to the Advanced Search feature and type in the words marble shower, you'll find a good bit of discussion that may help you make some decisions there. Not about the RedGard, but about the use of the marble.

I'll be curious to hear what Custom tells you.

If you really must use the marble, I really caution against the use of the direct bonded waterproofing membrane.

My opinion; worth price charged.
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Unread 01-27-2021, 10:46 PM   #5
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Quote:
Originally Posted by greentruck
...The house has a water softener so I’m hoping that helps...
A water dryer would be more appropriate.

Kidding aside, do realize that there are polished porcelain tiles that mimic marble pretty well. I’d look for that. These days, I will not install marble in a shower, and most certainly not on the pan. Just say no.
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Unread 01-28-2021, 10:32 AM   #6
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A glazed porcelain to mimic the marble would be a good idea, but I'd be really, really cautious about recommending a polished porcelain tile in that application.

I've heard of too many problems with that surface material, especially just trying to grout it without permanently staining it, to want it in a shower. But, then, I've never really tried it.

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Unread 01-28-2021, 01:10 PM   #7
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Like the others, I would avoid marble in the shower if possible. The Redgard would only make matters worse. There's less chance of the marble discoloring if he bonds it directly to the mud. Of course, I'm talking about dry pack mud that is porous enough for water to run thru it.
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Unread 01-28-2021, 06:31 PM   #8
Tool Guy - Kg
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Quote:
Originally Posted by cx
I've heard of too many problems with that surface material [polished porcelain], especially just trying to grout it without permanently staining it, to want it in a shower. But, then, I've never really tried it.
I respectfully disagree. I think it’s no different than someone using sanded grout on glass, then being surprised that it was scratched in the process.

With polished porcelain, it [grouting] doesn’t often cause problems. But a quick test tells you whether or not you need to use a cheap grout release before grouting (or sealing the tile). I have yet to stain a polished porcelain with grout. Maybe I’m lucky.

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Last edited by Tool Guy - Kg; 01-28-2021 at 10:22 PM. Reason: Add the word "grouting" to help add clarity
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Unread 01-28-2021, 07:42 PM   #9
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Maybe you are lucky, Goldstein. I've never heard of a scratching problem with the polished porcelain, but apparently the staining is a very serious consideration that I learned about only by attending some industry technical committee meetings. I was surprised to learn that it's a fairly common problem and one that's not repairable when it happens. Or at least no one at the time knew of a repair.

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Unread 01-28-2021, 10:21 PM   #10
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Oh, the joys of typing something that doesn't communicate what you were thinking. Nuts. No, I'm not talking about porcelain getting scratched at all. But I recognize that I could have made that clearer.

I was merely comparing two different types of damage, both caused by inexperienced installers. One is glass being scratched by grout. One is polished porcelain being stained by grout. Neither is a defect, but rather damage caused by inexperience.

I agree that polished porcelain is capable of being stained. But I don't see many staining agents in a shower. I'm still much more comfortable with polished porcelain vs. a natural stone in a shower. My 2 cents.
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