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Unread 09-23-2020, 08:00 AM   #1
julienaruff
Flooring Professional
 
Join Date: Apr 2005
Location: Rochester,NH
Posts: 21
Have you ever seen this? If so, what is it?

Troubleshooting this for a customer. This was installed about 2 years ago (by someone else) on a concrete slab. Tiles are reportedly 1'' thick marble. This oily, salty feeling substance is working it's way up through the grout in 2 spots. They clean it up and it's back in 10-14 days. I haven't visited the jobsite yet...have you ever seen/diagnosed a problem like this before? Thanks...
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Unread 09-23-2020, 12:27 PM   #2
fhueston
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Join Date: Jan 2016
Posts: 166
could be a form of efflorescence but it good also be something else. I would remove a tile and examine the setting bed. Check for moisture, etc
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Unread 09-23-2020, 03:53 PM   #3
jadnashua
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Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,073
The grout in those areas appears damp. Check to see if when you put that formation in water if it dissolves.
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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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