I plan to install 12"x24" rectified porcelain tiles and began having second thought about my sub-floor structure the day I was about to install the cement board. I went online and found a great tiling forum at
http://www.johnbridge.com/ that provided the needed advice. When tiling with large format tile, the floor must be extremely rigid to prevent flexing under load and consequently avoid cracking grout line and tile overtime (Tiles don't bend!). To satisfy this requirement, I had no choice but to tear the recently installed flimsy 1/4" OSB from the sub-floor and replace it with 5/8" B-C exterior grade plywood. Quite happy about putting more work against correcting the issue. Doing it right the first time is saving me "mucho dinero"!
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| Ready for duty |
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| 1/4" OSB and screws under attack |
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| Almost a finished room! |
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| Sub, old 1/4 and new 5/8 |
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