Insulating unheated garage
I live in a modified cape. The garage is attached to the house but there are no rooms above it nor is it heated or cooled. I'm looking to insulate the garage to help with the temperature swing in it since it is connected to 3+ rooms of the house (2+ on the side of the garage and 1 behind it).
I'm curious about the best way to insulate the roof. It is just rafters and sheathing from underneath. Can I just use batts of insulation between the rafters and against the sheathing? Most of what I read deals with heated spaces and the problem with moisture, but that is not an issue here.