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Unread 11-18-2020, 03:07 PM   #5
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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Welcome, Dawn.
Quote:
Originally Posted by Dawn
...the joist are brick and pretty strong...
The joists are not brick.

Joists are the wood pieces, usually nominal 2X sawn dimension lumber or engineered wood pieces spaced somewhere between 16 and 24 inches apart and supported from below at each end. That's the structure you need to evaluate. You can use the Deflectometer in the dark blue bar near the top of the page to get an initial go/no-go reading on that.

The difference between plywood and "cement sheeting," commonly referred to as CBU for Cementitious Backer Units is that the plywood is structural and the CBU is not. The CBU is only for the purpose of creating a friendly interface between the wood and the tile installation. You must also evaluate the wood subflooring you have to determine its suitability.

My opinion; worth price charged.
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