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Old 11-17-2008, 11:58 AM   #1
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Green Board over Vapor Barrier?


I'm working on remodeling my bathroom. I'm at the point where I'm starting to hang drywall back on the walls! I've already purchased a bunch of "green board" for the walls, since this is a bathroom. However, I've read that it is not a good idea to use green board over any sort of a vapor barrier. Is this true? The room originally had (and still has) foil-faced insulation around the shower with a poly vapor barrier stapled across the studs. Should I remove the poly before installing the green board? Or is it safe just to go over it?. I think the concern was that moisture could accumulate on the surface of the poly, thus dampening the green board. Just curious to hear some thoughts.

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Old 11-17-2008, 01:24 PM   #2
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Green Board over Vapor Barrier?


I'd use cement backer board for the shower area not green board but then that's just my opinion. Green board is water resistant but not water proof.


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Old 11-17-2008, 01:44 PM   #3
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Green Board over Vapor Barrier?


I'm already somewhat committed to the green board in that I've bought a whole bunch of the stuff! Don't really wanna go through the hassle of borrowing a truck to buy anything different. Right now I'm just debating whether or not I should rip off the poly vapor barrier.
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Old 11-17-2008, 02:43 PM   #4
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Green Board over Vapor Barrier?


Sorry to be persistant here, but you are just asking for problems using greenboard in a tub/shower enclosure. Borrow a truck and swap some of the greenboard for hardibacker.
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Old 11-17-2008, 02:51 PM   #5
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Green Board over Vapor Barrier?


Well, I'm not really installing greenboard IN the show enclosure. I've already installed a new fiberglass shower enclosure directly over the stud walls. I now have only to cover a 2' section of wall between the top of the enclosure and the ceiling. Regular drywall hung on these walls for the past 30 years, with the poly vapor barrier behind - no issues. My concern now is, with greenboard, should I remove the poly vapor barrier behind this 2' section surrounding the top perimeter of the enclosure.
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Old 11-17-2008, 04:01 PM   #6
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Green Board over Vapor Barrier?


Sorry, didn't clearly understand your situation. According to everything I've read, no vapor barrier should be used behind greenboard.
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Old 11-17-2008, 05:26 PM   #7
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Green Board over Vapor Barrier?


Yeah, that's what I've been reading too. Alright, poly vapor barrier is gone! Now what to do about the foil-faced insulation? I could rip of the foil. But this is an exterior wall, so don't I kind of need some sort of vapor barrier? I'm thinking the foil won't be as bad as the poly when it comes to condensation. Could be wrong though.
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Old 11-18-2008, 09:21 AM   #8
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Green Board over Vapor Barrier?


If you're just worried about that particular area, buy a sheet of Densarmor to hang the top of the tub. It will require a "glaze coat" of joint compound to get it smooth to blend in with the rest of the rock, but being "paperless", mold won't grow on it (according to mfgr's claims). I doubt enough moisture would ever accumulate to actually deteriorate the Densarmor (as attested by the regular board that survived 30 yrs.).

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