Marty, what I would be tempted to do is to get two
types of the 3 1/2 R13. One that is faced, and one
that isn't.
I'd split the "isn't" in half, then put that in
first. Then I'd put the faced over top of that,
and staple it to the joists.
Compressing the 6 1/4 would lower the R value.
By how much, I don't know. I've seen people use
two layers of insulation, though, of various
types, successfully.
If you do decide to split the insulation, please
wear a good dust mask and protective gear.
Shannah
MJSUKEY@cs.com wrote:
> I am getting ready to buy fiberglass insulation for the walls of my pole
> barn. 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? I would like the additional r value since
> I live in Northern Ohio but don't want to waste the money if compressing it
> drops the R significantly. Naturally Owens Corning customer service is
> closed today and I need to buy this weekend (sale going on :))
>
> Marty
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