Theresa writes from Louisville, Kentucky: "I have loose insulation (blown-in?) in my attic. Can I add rolled insulation over the loose insulation?"

Answer: Yes, you can add rolled insulation on top of loosefill insulation. If the existing blown-in insulation fills the floor joists, we recommend running the new unfaced insulation perpendicular to the direction of the floor joists. If the existing insulation does not fill the joists, place the new insulation between the joists.