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Posted by Larry on September 3rd, 2000 03:41 PM
In reply to Plywood AND Durock for floor underlayment? by Melissa on September 3rd, 2000 02:35 PM [Go to top of thread]

Hello Melissa,

It is not a good thing to install cement backerboard directly to the joints. It will flex and bend. Eventually it will fail.

Install a layer of 3/4" exterior grade plywood and a layer of cement backerboard over that. Plywood is much denser and stronger than cement backerboard and the exterior grade variety is much more resistant to moisture.

For cement backerboard installation instructions visit:

Good Luck!

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