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Old 06-22-2009, 06:30 PM
Avaire Archive Avaire Archive is offline
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Join Date: Jun 2009
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Author: Jonathan
Date: 4/8/2008 11:33 pm EDT
The short answer is it depends upon the flatness of your plywood floor, and the thickness. The subfloor should be at least 3/4" plywood. As a rule of thumb, if the tile "rocks" the floor is not flat enough. However, it will generally be easier to apply a self-leveling compound to low areas and knock-down any high areas than install a backerboard.
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