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Old 03-02-2012, 10:50 AM   #1
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Insulating Cathedral Ceiling

I am remodeling our garage which is heated and air conditioned. I want to reinsulate the ceiling and install vents to stop condensation from forming. The roof construction is 2 x 6 rafters, can I use Owens Corning Foamular F-150 2" thick? Must I leave a 1" to 2" air space between the foam and the plywood roof and install roof vents? Which roof vents work the best? How many vents? Garage size 22' x 32'. The ceiling will be vaulted and sheet rocked. Location: Minnesota.Thank you.


Last edited by langseth; 03-02-2012 at 11:10 AM. Reason: added location
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Old 03-02-2012, 11:03 AM   #2
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It would be best to go back and edit your profile and addd where you live so we can ansewer your question.

Your going to need soffit venting, foam baffles, ridge venting.
2 X 6 rafters will not give you enough room for much insulation. It may be best to at least add 2 X 2 straping to the bottom of the joist so you could at least get R-19 in there.
It's often better to have the bays spray foamed, or insulate the roof as well as the ceiling to give you the total insulation you need.


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