Vapor Barrier behind wonderboard
Posted by Scott Kerstein on February 06, 1999 at 00:05:16:
I need some advice. Is a vapor barrier (4 mil) required behind wonderboard? Also, I have a recessed ceiling in the shower/tub area and I want to close it off with green board. Does it need to be ventilated from the attic, or could it be air tight?

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