Bob writes from Portland, Oregon: "I would like to install faced insulation (R19) under my floor. I have 4 feet between support beams with 2x6 tongue and groove for subfloor. How would I install 23 inch wide rolls?"

Answer: That's an easy one, Bob. The answer to your question can be found on the Owens Corning website. For more information, click here on the word Crawlspace and you will see complete instructions for the project you describe, including pictures.

Three points to keep in mind: (1) Always install the insulation with the vapor retarder toward the warm side of the structure in heating climates such as yours. In a vented crawlspace, the warm side is usually up, closest to the floor. (2) Once the insulation is in place between the floor joists, insulation hangers or nylon straps should be used to hold the product in place. (3) A 4- or 6-mil. polyethylene vapor retarder should be laid down to completely cover the ground.