Marty,
I'm in New York, and typical exterior wall construction is 2x6 framing with
R-19. As everybody knows, a 2x6 isn't 2 inches by 6 inches. It's more
like 5 1/2. The R-19 is intended to fit in this space. I don't know where
you got the 6 1/2 number. It doesn't sound like you would need to compress
the insulation very much. I would go with the R19. BTW, when I put an
addition on my house some years ago, I bought R-21 insulation that was
intended for the same wall thickness. I don't think it makes that much
difference, but at the time I figured "what the heck".
-Steve
At 09:45 AM 12/7/02 -0500, MJSUKEY@cs.com wrote:
> The wall cavity depth is a little over 5" (4x4 post and 2x4 purlins).
>My choices for insulation is 3-1/2 R13 or 6-1/4 R19. My question is, if I
>put the 6-1/2" insulation into a 5" space will compressing it lower the R
>value to that of the 3-1/2" stuff?
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