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Unread 09-05-2017, 02:59 PM   #10
Steve Taylor
Registered User
 
Join Date: Jul 2010
Location: So. California
Posts: 279
Cement backer unit must be mechanically fastened to the substrate. The structure of the CBU is not designed to be adhered to a substrate like a tile. The product is not structurally sound like plywood. We have had people try this and they nearly always fail. I agree they should have done a bonded mortar bed.
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Steve
Retired Tile Industry Chemist
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