Mike writes from Dayton, Ohio: "I am insulating a detached garage, is there any reason why I should not use vapor barrier faced insulation in the ceiling?"

Answer: You do not say whether your detached garage will be heated or cooled. My friends at Owens Corning do not recommend insulating an unconditioned space. Doing so will create a "hot box." When the sun, ambient air and hot car engine heats the garage in the summer, the insulation will cause that heat to be retained longer. If the space is conditioned and the attic is ventilated, you can use Kraft-faced insulation in the ceiling and walls.