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Unread 06-08-2021, 08:39 PM   #1
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Blotchy Limestone Tile - Will it Ever Dry?

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Hi Everyone,

Would really appreciate your expert help...installer put this up a month ago on our fireplace wall using a gray thinset. It was blobbed on the back of the tile and not spread. You can see the blotches where the thinset was placed. We were hoping it would "dry" and even out in appearance by now. Please advise if it will ever dry, or if this needs to be totally redone. I would love to use this stone so if install was done incorrectly, please advise on how to apply correctly. For reference this is Emser Tile Striated and Chiseled Metro Blue "limestone marble." Thank you for your help!
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Unread 06-08-2021, 09:40 PM   #2
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Welcome to the forum, SP.

Sorry to see this problem. Yes, it was installed incorrectly with the “blobs”.

Can we back up a bit and ask exactly what setting material was used? Was this a dry powder from a sack that was mixed up...or was it pre-mixed from a plastic bucket? Perhaps, there’s some leftover in the garage or something that you can see?

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Unread 06-09-2021, 12:19 AM   #3
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Thank you for your response. I'm pretty sure the dry powder was used. My general contractor spot-applied it to a test piece with gray thinset but couldn't replicate the issue because it was just a loose piece and not attached to a wall.
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Unread 06-09-2021, 03:23 AM   #4
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I've heard from product reps that limestone is known to have issues with blotchyness after being wet. Whether this issue is related to the thinset being applied incorrectly or not is another question. From what they were telling me it is worse than carrara marble for looking wet on random pieces after moisture is applied.
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Unread 06-09-2021, 11:27 AM   #5
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That's interesting...that's the first time I heard that about limestone.
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Unread 06-09-2021, 01:40 PM   #6
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Limestone and marble are very similar...marble is metamorphized limestone (i.e., heated and compressed).
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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