Outdoor Tile Sub-Floor


Old 07-06-00, 12:58 PM
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I'm building a deck outside with pocelain tile surface. The deck is 3'-0" above grade and open to the bottom. Do I need to water-proof the 3/4" plywood sub-floor before installing the tile or do I need to use backer-board.
If using plywood, does it need to be treated or sealed? Any other suggestions.

The climate is dry.

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Old 07-07-00, 10:31 AM
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Keeping deflection down is the key to a good tile job that won't crack. For that you need a good subfloor. The ceramic tile institute says to limit deflection to 1/360 of the span of the wood you are laying tile on. I would put down a 3/4" treated plywood subfloor and 1/2" cement board to get a good base to lay the tile on. Use a exterior adhesive on the joists to lay the plywood on (nail them also). Use a thinset under the cement board and the nail the cement board down.

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