Jeff writes from Windsor, Pennsylvania: "I'm redoing my crawl space under my house with new insulation. I have at least 5 vent holes and was wondering if it is required to use a vapor barrier after I hang the new insulation. I hear that you can do it either way, but it is better if the insulation "breathes"."

Answer: We recommend faced insulation in an unheated crawlspace. The vapor retarder should face the warm-in-winter side, which in your case is the interior of the home.