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Unread 02-26-2020, 04:49 PM   #72
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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There is no problem bonding to plywood with thinset mortar so long as the mortar meets the requirements of ANSI A118.11.

CBU stands for Cementitious Backer Unit and generally means products such as Wonderboard, Durock, Hardiebacker and similar. They are attached to the floor over a bed of thinset mortar using mechanical fasteners.
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