try googling around for the R value per inch. (Ransley says 3.5 and
that sounds about right)
the depth of the 2x10 is 9.5 inches (IIRC) minus the vent baffle depth
(don't know what that is) * the above researched r/inch is your
maximum fiberglass insulation.
Lets say the baffle takes up 1 inch (a guess) and the 3.5R/inch
figure is correct:
(9.5" - 1") * 3.5R/" = 8.5" * 3.5R/" = 29.75R"/" = 29.75R
If you have 2x10s and a vent baffle, i'm going to guess that it's a
roof. If that's the case, I'd be tempted to use foam which can give
you up to ~7R/" (R60 in your instance) but then we don't know where
you live or what your climate is like. Look up with to DOE what the
suggested R values for you walls and roof are in your state to see
which way you should go.
Verso l'esterno! Verso l'esterno! Deamons di ignoranza.
Thanks all for the information. Thanks also for the tip to check out
the DOE, which has a wealth of information on the insulation. Here's
the link for others:
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