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We are installing a steam shower in our gut renovation of a 3 story brownstone. Wondering if anyone has experience with the Mr. Steam or Steamist units and the various vapor barrier installation options. Steamist recommends just 3 or 4ml plastic sheeting behind the cement board. Others recommend a kerdi vapor barrier on top of the cement board with tile on top of that. Would using marble or porcelain eliminate the need for the kerdi vapor barrier? Any thoughts are appreciated.