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Atlanta, ga
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Kenmore, WA
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Vapor barrier over flr joists, below sheathing-ok?
[#2] Posted: 03/30/2012 - 01:00:34 AM |  |  |
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What kind of foundation are we talking about? Slab, crawlspace or basement?
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Atlanta, ga
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 Vapor barrier over flr joists, below sheathing-ok?
[#3] Posted: 03/30/2012 - 06:11:29 AM | | |
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Crawlspace
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Kenmore, WA
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Vapor barrier over flr joists, below sheathing-ok?
[#4] Posted: 03/30/2012 - 08:24:39 AM | | |
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It could end up being an issue. Vapor diffusion will push moisture-laden interior air toward cooler/drier air. If things get too cool in the crawlspace vapor could condense on that cold plastic and become trapped between the underside of the floor and the plastic and lead to wood rot. He'd need to insulate the rim joist above the foundation at the perimeter of the crawl as well as the foundation wall and the underside of the floor to ensure things never cool to dewpoint. He'd need to ensure there is zero air leakage behind that plastic at the perimeter of that room, so they don't have a situation where moist air is condensing there. Lots of little details needed to get it right.
ONE TEAM - ONE FIGHT!!!
Mike
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indy, IN
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Vapor barrier over flr joists, below sheathing-ok?
[#5] Posted: 03/30/2012 - 8:21:51 PM | | |
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Is the crawlspace floor covered with a vapor barrier?
Would this lead to excess moisture collecting on the joists?
It seems to me like removing the plastic, insulating the perimeter of the crawlspace, insuring adequate ventilation and covering the "floor" of the crawlspace properly is the right way to go.
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Atlanta, ga
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Vapor barrier over flr joists, below sheathing-ok?
[#6] Posted: 03/30/2012 - 8:46:23 PM | | |
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By the way Hausdok, what frame is that in your avatar? My bet is 1950s frame with 350 Chevy upgrade.
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Newberg, OR
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Vapor barrier over flr joists, below sheathing-ok?
[#7] Posted: 03/30/2012 - 11:55:18 PM | | |
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I recall seeing a large 1950's apartment complex done that way in downtown Portland. There was A LOT of rot under that place. It's been so long ago, I can't remember the exact details, so this post probably won't help much.......
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Brandon
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Kenmore, WA
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