Quote:
Originally Posted by Scuba Steve
I personally do not ever install tile or stone on plywood. My preference is two layers of plywood + an uncoupling membrane like Ditra.
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I did a remodel where new interior walls were being built and did the two layers of plywood and Hardyboard. More recently I put tile in a bathroom where the doors and walls were already up. The subfloor is 3/4 plywood. I got under the floor and added 2x4s to the sides of the floor joists up against the bottom of the subfloor, effectively making them 4 7/8 wide and the gap between them 11 1/4 inches. I added screws into each 2x every 12 inches down from the top. Ditra had come out by then and I used it under the tile. I figured the test would come when I filled the bathtub. The result is outstanding.