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Unread 07-19-2019, 09:09 AM   #13
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
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Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 23,098
Yeah, you need solid support under the tiles. If mastic was used, it might not be dry and rock hard. And this would lead to discoloration and slightly rocky tiles from foot pressure that could leave cracks around some tiles.

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