The walls in my attached garage are finished. Uninsulated but finished. However I would like to insulate the ceiling/roof. I have the large spacing in what I could call trusses which is somewhere in the 32" range. I contemplated adding unfaced bats of insulation to the underside of the roof(directly against roof since the rafters have 16" spacing) but that will only result in being a bad idea.
Do I plan on adding additional trusses so I can finish the ceiling and add insulation since that seems like the correct way to go about it? The final issue I run into is that I have no ventilation in my soffits or roof vent so any summer ventilation is strictly what leaks past the overhead door. I'm not opposed to adding soffit vents, but cutting a hole in a new roof is not high on my list of favorite things to do. Can I add a ridge vent to existing shingles without replacing any?
I'll try to get my technical names for everything corrected so everything makes more sense.