R value for garage attic


Old 08-31-10, 01:26 PM
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Join Date: Nov 2004
Location: USA
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Question R value for garage attic

I'm going to insulate my garage this fall, and I'm wondering what R value I should use in the attic. Garage will not be heated for quite a while, running out of renovation funds . Just like to keep it a "bit" warmer in the winter.

I'm in the Chicago area so it does get very cold here once in a while.
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Old 08-31-10, 02:20 PM
Join Date: Oct 2008
Location: New England
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One of the issues with a garage is the potential moisture that can be brought in, like rain and snow on vehicles. Once that moisture is inside, it needs a way out or it will condense on or inside your walls or ceiling.

If you insulate the attic, you should also ventilate above and air seal below that insulation. An air barrier and a vapor barrier would be recommended.

The actual R-value is based upon the temperature you want inside. If you are not adding heat, then you would simply be slowing the heat gain during the day as well as the heat loss when the temps drop. Hard to say what temp you would average out to.


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