Thread: Do I need a vapor barrier behind cement boards in shower?
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Wayne Whitney Wayne Whitney is offline
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Default Do I need a vapor barrier behind cement boards in shower?
On 2007-11-24, wrote:

According to the tile bible by M. Bryne I do but what I don't
understand is this: If water gets through the tiles/grount and then
penetrates the cement board then wouldn't it be better to let it
essentially evaporate into the air void between the walls rather
than trap it?

When I redid my bathroom, the building inspector told me to use a
permeable membrane behind the cement board, like 15 lb felt.

Cheers, Wayne
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