vapor barrier behind durock question


Old 09-09-05, 05:35 PM
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vapor barrier behind durock question

I was planning to use the 4-6 mil plastic behind the durock in my shower/tub alcove since, based on all I've read here, that seems to be the thing to do. But I read a reply to a post that mentioned to be sure to use vapor barrier on the outside walls to protect the insulation. So I'm just I use the plastic regardless of whether they are outside walls or not or do I only use it if the bathroom has outside walls? My bathroom has only interior walls. Thanks again.
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Old 09-09-05, 06:34 PM
Tileguybob's Avatar
Join Date: Dec 2004
Location: Ocean Grove, NJ
Posts: 931
Put the plastic up. It is there to protect the studs from future water damage should water find its way behind the tile and get through the cement board. Cement boards are water resistant, not waterproof. The outside wall thing has to do with trapping moisture or condensation in the wall cavity with no breathing option due to it being sealed on the inside as well as the outside of the insulation.

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