Bob writes from Alameda, California: "I'd like to insulate our crawlspace ceiling as our hardwood floors on the first level are really cold. I have enough extra Fast Batt Pro Pink R-21 fiberglass insulation that will fit between the joists for the project. Can this product be used for this purpose? Any moisture or fire hazard issues?"

Answer: Yes, the product you have can be used in a crawlspace. If it has a paper facing, you will want the paper facing up. You can use insulation hangers to hold it in place. They can usually be found at any dealer that carries insulation. Also, if you have a dirt floor you will want to put down a 4 to 6 mil polyethylene sheet. As long as the space is conditioned there should be no moisture problems. It only needs to be covered with a thermal barrier if the paper is left exposed.