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Have you got a drywall ceiling? If so, I would sure consider using the blown in cellulose type insulation. It is cheap and easy to use and works very well in attics. I would put in at least 6 inches, but prefferably 10 or 12. I like fiberglass batt insulation in walls, as it doesn't settle as bad as loose fill types can. But with conventional trusses, it is a real pain to use batt insulation except between the trusses, as the cross chords of the trusses get in the way if you try to add batts perpendicular to the way the trusses go. The blown in loose fill settles in around the cross chords and gives a lot more effective insulation job. If you don't have a ceiling yet, I would not suggest insulating until you do. Most fiberglass has paper backing that can catch fire if it is exposed. Your attic should be ventilated. It is probably a little late for a ridge vent, but adding some of those vents like are on the main part of the house would not be that hard. Venting the hot attic air will make your garage much cooler in the summer and will make your composition roofing last longer, as well as removing any attic moisture. Good luck, it looks like a nice place.
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