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Unread 10-25-2020, 09:05 PM   #25
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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Quote:
Originally Posted by S
Flexbond and 1/4" Hardiebacker on top of that.
Flexbond under the CBU is not overkill, S, it's overspend. The purpose of the thinset mortar under a CBU is not to bond it to the subfloor, it's to provide a 100 percent footprint for the CBU panel. The mortar holds it up, the mechanical fasteners hold it down.

One of the few areas where buying and using a cheap mortar is fine.

My opinion; worth price charged.
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