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Old 06-16-2019, 01:18 AM   #9
Kman
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Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
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I think you could use the Hardibacker if you want, but I don't think it's necessary. You're worried about it just being attached to paper that makes up the face of the drywall. But we're talking about sheer forces here. The weight of the stone won't be pulling the paper away from the wall, but down. It's stronger than you think.

Have you checked for any clearance issues, such as water supply lines, and from the wall to the toilet flange? Sometimes adding just an inch is enough to throw everything off.
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