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

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  #1  
Old 01-29-07, 06:11 AM
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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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Old 01-29-07, 06:49 AM
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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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Old 01-29-07, 07:10 AM
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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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Old 01-29-07, 08:28 AM
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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.
 
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Old 01-29-07, 09:57 AM
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Yeah, I wouldn't sweat it too much, that blueboard will make a huge difference all by itself.
 
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