My wife and I built a new house just outside of Winnipeg, Manitoba. I'm considering insulating my attached garage (43 x25)but i would need to insulate 3 walls(one wall being the double door, and single door) and the attic. i'm pricing it out and it may be out of my price range to do the whole project but I was thinking of maybe doing the exterior walls and leaving the attic to a later date. The reason I'm thinking about doing the exterior walls is because of the cold winters and the longest wall faces north. I do have plans of putting radiant heat in down the road. I realize that heat rises and I should do the attic also but I was just hoping to get some feed back?