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Originally Posted by S
Flexbond and 1/4" Hardiebacker on top of that.
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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.