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Does using 2X6 Bats in a 2X4 wall increase R?


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01-29-07, 06:11 AM   #1  
Does using 2X6 Bats in a 2X4 wall increase R?

I have just insulated a 2X4 wall with R19 unfaced bats and covered w/6mil vapor between house wall and garage and other exterior walls.
Any issues w/using the 2X6 thickness in a 2X4 wall? My blue board is already up but I'm 2nd guessing myself. (I bought the wrong thicknees by accident)
Thanks for any help.

Jay

 
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01-29-07, 06:49 AM   #2  
Sorry... it would be worse. Insulation traps very small pockets of air. The air insulates. You're trying to stuff 5" of insulation into a 3" of space. You are losing over 50% of the space for those air pockets. Can you use it up in the attic or exchange it?

 
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01-29-07, 07:10 AM   #3  
no exchange possible. It's already installed and cut up from the roll. I've got another wall 8 ft wall that doesn't have the bb up yet that I guess I should remove and re install the smaller bats.
Damn.

I leave what's already behind the existing BB because it'll atleast be better that the old R9 w/barrier facing the wrong way that I replaced.

 
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01-29-07, 08:28 AM   #4  
I have peeled off the excess fiberglass [about 2"] when I had to use the R19 in a 3.5" cavity, using R13 would be better.


retired painter/contractor avid DIYer

 
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01-29-07, 09:57 AM   #5  
Yeah, I wouldn't sweat it too much, that blueboard will make a huge difference all by itself.

 
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