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.

Reply to
Paul
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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

Reply to
m Ransley

And maybe you know what you're talking about, maybe not.

Reply to
AJ the Controler

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.

Reply to
Philip Lewis

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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Reply to
Paul

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