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Old 08-20-09, 10:21 AM   #2
The Gardener
Join Date: Oct 2008
Location: Manitoba - Canada
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I would either go with Roxul insulation which is rated R14 for 2x4 studs and forget the rigid foam overtop...cause then if you ever need to get to the electrical, you'd have to cut through the rigid foam or take it down somehow since your garage probably has older electrical in it...maybe not. I'm no electrician.

You could also just stick in 3 or 4 inches of rigid foam and forget the bat insulation altogether. Then you can just cut out the area for the wiring. Not sure if you'd still have to vapor barrier it if you do it that thick...I think that's only for spray foam that you don't need it if it's over 2.5 inches.

I'd also make sure you have 2 vents, one on each side of your garage to allow air to pass through and keep the air moving in there.
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