did you allow space under the roof or is the insulation pressed tight against the roof sheeting? I'm not sure would this cause a condensation/mold issue? just askin.
I have always heard leave an 1" airpocket under the sheething. but how would it be any different than how we do walls?
yes this is what you are supposed to do... no that is not what I did

there is a 1" gap at the bottom and top of each sheet as mounted in place, the actual corners at the bottom of the roof have no insulation at all... and there is nothing packed into the eaves but air... we figured this should be sufficient, and since we arent sealing the fiberglass behind wallboard/plywood or anything like that so we figured it should breath enough.
There has never been any sort of mold/mildew problem in the garage, no water leaks of any kind, and the only wood rot ever experienced was the corner posts at the ground... and they were replaced. Also the boards across the roof are pretty dry... they would likely soak up the moisture before the fiberglass IMO.
Because of those factors I felt relatively safe with skipping the 1" air behind the fiberglass... if I do have a problem it will come to bite me in the *** in a couple of years... and by then it shouldnt be much a problem.
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