If I insulate my roof, should I put in those plastic vents that go between the studs for air flow? I would like to use it for a work shop and probibly have some kind of heat source. i live in Northern Alberta.....
Insulate the ceiling, not the roof. Place the vapor barrier (foil or heavy paper) facing the garage. For Alberta you want at least R-30, or 9" of fiberglass insulation. The garage should already have eave vents, hold the insulation away about a foot from them so the insulation does not block the air flow from them.
if the garage is heated do it all the cost of the insulation vs the cost of heat today is outrageous doing it now will save a ton later
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You will normally install both insulation and a vapor barrier, like a house, these go above the ceiling, but NOT the underside of the roof. Yes you should install vents, you need the air movement.
Insulating the ceiling and then the roof would be a huge waste of money. You only insulate on the cold side of a heated area. Why would you put insulation on the roof when you have insulation in the ceiling and there is no heat source in between the two?. Put R40 insulation in your ceiling, roof vents in your roof, and you will be fine. You can add more insulation if you want, but it gets to the point where you are not really doing much any more.
