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Yep, another Vapor Barrier question

haugy

Well-known member
Joined
Dec 1, 2009
Messages
783
Location
Nashville, TN
I searched and couldn't find the most basic info, so basic it's considered a stupid question.

30x40x14' Pole Barn. I'm going to be framing out the inside and adding insulation and drywall later. Before I frame it out and add more wood work inside I know I need to put in Vapor Barrier.

With that, a couple of questions:

1) How perfectly sealed does it need to be? I cannot get Vapor barrier in behind the 6"x6" posts. There's a 10' span between them which I will be putting it in, but does it need to seal up every air space possible?

2) Do I just roll it out, and staple it in place like a madman?

3) And the roof. If I will be spraying loose insulation up there later when drywall is added, where in the heck do I put the vapor barrier? Along the roof purlins like the walls? On top of the insulation?

I know they seem like simple questions, but for the life of me my brain is fried and I can't put it together. Thanks for any help.
 
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trbomax

Well-known member
Joined
Mar 21, 2010
Messages
2,556
Location
starvation lake,mi.
I personally dont want to see a true vapor barrier in a steel sided bldg. The perm. foam wrap that goes under the steel is a vapor retarder,usually about a 3. The kraft paper is a retarder as well.Steel sided buildings get very hot behind the steel in summer,I want any humidity to be able to go either way.
 
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