Poly AND Housewrap?

 
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Old 05-17-2011, 09:41 PM   #1
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Poly AND Housewrap?


Just read an article which said that the proper way to build an exterior wall included both housewrap on the exterior of the sheathing and poly (>/= 4 mil) just inside the drywall - over the paper backing of the insulation.

I've always just stapled up the batts (assuming the paper served its purpose), then ran drywall over that.

Am I missing something? Won't poly on top of the paper just create a mold problem within the wall if you already have Tyvek on the exterior?

Is this the new method - or are the old ways still acceptable?
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Old 05-17-2011, 09:42 PM   #2
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Re: Poly AND Housewrap?


I have never done it with faced batts, but with unfaced batts always poly over it.

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Old 05-17-2011, 10:58 PM   #3
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Re: Poly AND Housewrap?


Sure - makes sense with unfaced and blown-in insulation.

Just wondering if the poly industry (which gets a lot of my $$ already through the RRP) had scored another hit by making it 'standard practice' to poly over paper-faced batts too.
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Old 05-18-2011, 12:24 AM   #4
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Re: Poly AND Housewrap?


Actually, I'm pretty sure the code says that you can ONLY do poly if you DON'T use housewrap. I have an issue right now with mold growing on my insulation in all of my walls, but mine was "done to code". This isn't a house I built, but one we bought and moved into between residences. I found the mold problem when I had mold start showing up on the backs of switch and outlet plates.

My situation is vinyl siding, no tyvek, paperless insulation, and clear poly on the studs, then drywall.

I am still trying to figure out the best way to deal with it. Air quality inside the house has been tested and is perfect(as perfect as any), but I can't very well sale the house knowing it's there now.

I found the issue last fall, and there was STILL condensation on the poly, on the insulation side of it.

Speaking of...........any ideas? My only thoughts are going from the inside, tearing out the drywall and cutting the poly out completely, then putting back faced insulation, OR going from the outside and remove the vinyl and sheathing and then cut out the poly and replace the insulation. In that case I could go back with tar paper or tyvek, then re-side it.

Thoughts? Ideas??
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Old 05-18-2011, 04:50 AM   #5
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Re: Poly AND Housewrap?


It depends on your climate, really.

Further down south is diffedrent than up north.

Here we HAVE to put poly on the warm 2/3 side of the wall.... what does that mean? just behind the drywall, really. Housewrap on the outside.


Then I realized you were using faced batts. I dont think that gets used here...
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Old 05-18-2011, 07:04 AM   #6
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Re: Poly AND Housewrap?


I suggest a look at building science.com web site.
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Old 05-18-2011, 08:41 AM   #7
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Re: Poly AND Housewrap?


Quote:
Originally Posted by Framer53 View Post
I suggest a look at building science.com web site.
Excellent site! Will look more when I get a chance. Louisville is Zone 4, but very close to the zone 5 border - so I'll peruse the articles here.

Thanks again

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