Maxiimum Insulation in 2x10?

What the maximum R-value fiberglass nsulation bat that will fit without compression in a 2x10 with a vent baffle?
Thanks.
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Fiberglass is 3.5 r per inch so R 29.75 for 8.5 ", figuring a 1"baffle There is a higher R value fiberglass made maybe it is 3.75 R per inch
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And maybe you know what you're talking about, maybe not.
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snipped-for-privacy@yahoo.com (Paul) writes:

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.
--
be safe.
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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:
http://www.eere.energy.gov/consumerinfo/
(Paul) writes:

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