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How waterproof is exterior plywood if used for base to lay tile on an exterior deck?

April 26, 2017base deck exterior lay plywood tile Used waterproof

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How waterproof is exterior plywood if used for base to lay tile on an exterior deck?

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Exterior grade plywood is not waterproof and is not meant to be used as a base for tile in exterior applications. Exterior tile needs to have a cementious type base which will not swell or deteriorate when wet.