I have recently replaced a low slope (almost no slope) roof on my attached garage with a sloped roof. See attached "Microsoft Paint" doodle! The low slope was leaking badly and was suggested to replace it with a sloped one. Anyway, it is basically a sloped roof coming down from my home over top of my attached garage. I am wondering about the best method to insulate and vent. My own common sense tells me to create a sorta "attic" in the upper area of the new roof, and install those outside vents on either end of the newly created "attic" section. Also, run those rigid styrofoam venting channels down between the rafters to the soffits, insulating with the fiberglass overtop of the venting channels, and then vapor barrier. Does this sound like a reasonable solution, and if so, how often do I have to run the venting channels (ie: between every rafter, every second rafter, etc).
Am I going overboard here, or is this what should be done?
Vent channels go in every rafter bay to prevent the insulation from touching the plywood any where that would be possible but not needed anywhere else. try to have an equal amount of air venting at the roofs bottom edge as at the top or ends. they do make a shed roof vent system so you could conceivably "ridge vent" at the top across the house wall.
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