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Ceramic tile floors require a rigid base, the wood and screwing is no way overkill. It all is requried to keep the floor from flexing. This has been proven over and over again, so the reason for standards, so folks don't go through all the hard work to just have the tile and grout crack on them and have to do it over again. I've seen it happen and it's more work to take it out and do over. But these folks didn't know any better. You do, so hope you enjoy your medicine
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