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Unread 04-06-2021, 05:35 PM   #1
markdb77
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Marble tile floor install - please advise

Many thanks to this forum.
You all have helped me immensely in the past with DIY projects and I am looking for some advice again.

I am installing 45 sq ft of this tile in a bathroom floor:

Daltile
Restore Mist Honed 12 in. x 12 in. x 8mm Marble Mosaic Floor and Wall Tile

I picked through the lot at several stores to get very closely matched pieces.

My concern is that some reviewers of this tile claim it changed color after installation. (pictures attached)

Is this due to not hand-selecting each piece?
Bad installation process?

I have heard some people attribute this discoloration to different iron levels in the marble, trapped moisture, not waiting long enough before final sealing...

How do I prevent this?
Choose the proper sealant?
seal both sides of tile prior to installation?
what is best thinset mortar to use? best sealant?

Please advise and much appreciation in advance.
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Unread 04-06-2021, 05:45 PM   #2
Lou_MA
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Definitely don’t seal the bottom of the tile.

Use a white thinset.

Is this going in a wet area? @ 45 sf, I assume it isn’t.

What are you setting over? Cement board? Ditra?
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Unread 04-06-2021, 06:26 PM   #3
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It is going over cement board.
Not going in the shower, but it will be right outside the tub... the kids will soak it.
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Unread 04-07-2021, 11:20 AM   #4
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Would sealing the bottom of the tile prevent proper bond from thinset mortar?

Does the sealant actually form a water barrier on the surface of the marble?

Ay advice from someone experienced with marble installation on how to prevent this issue?
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Unread 04-07-2021, 12:19 PM   #5
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Welcome, Mark.

1. Maybe, maybe not. It certainly won't help it at all.

2. I trust you meant sealer rather than sealant and no, most of them do not.

3. I dunno.

My opinion; worth price charged.
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Unread 04-07-2021, 10:30 PM   #6
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1)
Quote:
Not going in the shower, but it will be right outside the tub... the kids will soak it.
2) From HD on this marble tile:

"Water absorption level suitable for wall, backsplash, and light traffic floor use"

Quote:
My concern is that some reviewers of this tile claim it changed color after installation.
Not sure #1 and #2 are compatible. Could be why reviewers claim it has changed colors. Be interested if folks using it on a backsplash or other wall application saw the same changes in color.
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Unread 04-08-2021, 03:27 PM   #7
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It is my understanding that the general consensus is that a bathroom is a "light traffic" area.

I found advice from old forum posts that a good approach to installing white carrara marble..

- apply Laticrete 9235 waterproofing membrane to BACK of tiles
- install with white thinset mortar (any product recommendations?)
- apply Stain Proof Dry Treat sealer
- grout with Laticrete Spectralock
- pray to tile gods that the minerals in the this lot of marble don't negatively react with anything in the process to alter color

Is this a good approach?
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Unread 04-08-2021, 04:23 PM   #8
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I'm a bit surprised anyone recommended putting 9235 on the back of white tiles. Laticrete's 9236 is a jet black liquid-applied direct bonded waterproofing membrane.

Recommending the use of white thinset mortar after that doesn't make a whole lotta sense to me, either.

I find the use of an epoxy grout in that application a bit questionable, too. In your environment, where you anticipate the tile installation seeing a good bit of moisture from above, the epoxy will not keep all the moisture from penetrating the tile installation, but it will seriously impede the evaporation of the moisture back up through the surface. Think I'd want a cementitious grout in that application.

Can you give us a link to where you found those recommendations?

My opinion; worth price charged.
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Unread 04-09-2021, 12:01 AM   #9
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Quote:
It is my understanding that the general consensus is that a bathroom is a "light traffic" area.
likely correct, I was looking at it from the water side as opposed to foot traffic. Going off of the "kids will soak it." After all, we are talking about the staining from water as opposed to folks walking on it.

Just offering a perspective to consider.
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Unread 04-09-2021, 01:03 PM   #10
markdb77
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link to recommendation.
https://www.johnbridge.com/vbulletin...t=79371&page=3

IN the previous list, I added in the white thinset mortar, per manufacturer installation specification.
Agree, doesnt make much sense after applying a black product to back of tile. I didnt realize that 9235 product was black.

All things considered.. what products are recommended for this type of installation?

Cementious, nonsanded white grout? white thinset mortar?

Any precautions I can take to mitigate the risk of these turning color, like in the posted pictures?


Also, I used grey modified thinset mortar on the cement board seams. (hadnt picket out tile yet)
Is there a concern of the grey color bleeding through , altering the white carrara marble tiles? cover the seams with redguard?

Thanks for all of the replies!!
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Unread 04-10-2021, 08:11 AM   #11
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They make glazed porcelain tile that looks like marble. ..that will cure every single problem you have.

It is with great trial and error in this forum, that most setters will agree: natural stone in a wet area is unpredictable and generally a no no
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Unread 04-10-2021, 08:38 AM   #12
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1. White cementitious products.

2. I would want sanded grout unless I couldn't force it into the joints or it scratched the surface unacceptably.

3. None that I'm aware of except the very good suggestion from Pat in Post#11.

My opinion; worth price charged.
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