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Can I use grout to set the sheets on my shower floor?
the thinset keeps pushing up thru the tiles and I have to use elbow grease to clean the thinset out so I can grout.
and while I an asking if I use Custom's REDGARD ,is the thinset applied directly on the Redgard ?
 

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Now I'm no expert, but my shower is done with 1"x 1" tiles on 12" x 12" sheets. Mortar that came up through got sanded with a grout saw for grout. 2 years all good and no leaks
 

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Stuck in the 70's
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Use thinset, not grout, to set tiles.
Remove the excess thinset right away. It is easy to remove while it is wet. Once it dries and hardens it is a lot more difficult.
If you used Redgard on the walls, yes, tile directly on the Redgard.
 

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Sounds like you may be using to much thinset.
Are you using a toothed trowl?
 
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use way less thinset. I had the same issue with some accent tiles recently, the less thinset I used, the better and easier they were to install.
 

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Tileguy
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Can I use grout to set the sheets on my shower floor?
No.

the thinset keeps pushing up thru the tiles and I have to use elbow grease to clean the thinset out so I can grout.
This is because you are using the WRONG TROWEL.

and while I an asking if I use Custom's REDGARD ,is the thinset applied directly on the Redgard ?
Yes.
 
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