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Old 08-29-2010, 01:11 PM   #1
cmj
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Attached garage too hot, will this help?


Hi Guys,
I have an attached garage that gets about 15-30 degrees hotter than the ambient outside temp during the summer. This extra heat radiates to the two bedrooms that share the wall with the garage. The garage currently has no roof ventilation, no insulation, and the joist are open. Here is what I want to do.
1. Add a louvered wall vent + electric exhaust fan up at the peak.
2. Add 3" foam board insulation in the rafters, leaving about 1/2" air gap between the foam and the roof plywood.
3. Instead of option #2, add a radiant barrier to the underside of the roof.

In conjunction with #1, which option would work better, #2 or #3?
If I don't get good results I might open up the shared wall and insulate that too.

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Old 08-29-2010, 02:30 PM   #2
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Attached garage too hot, will this help?


Is there any ventilation in that roof at all? If not, I would suggest adding a ridge vent at the top and intake vents at the sides. Then you could make channels out of foam board and stuff them between the rafters. Building code in your area may require you to cover foam board with something that retards flame spread.

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Old 08-29-2010, 05:23 PM   #3
cmj
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Attached garage too hot, will this help?


There are 3 small vents on one of the walls very close to the floor, I don't think there is any other ventilation.
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Old 08-29-2010, 08:43 PM   #4
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Attached garage too hot, will this help?


That ventilation is to keep things like gasoline and natural gas from building up enough to blow up - so I was told. Your roof needs to vent if you are going to insulate - and that requires going up there, cutting, flashing, etc. It will help you keep cooler, but you need to be able to get the venting part done right.
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Old 08-30-2010, 12:00 AM   #5
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Attached garage too hot, will this help?


That shared wall needs to be insulated...
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