Eric writes from Hamburg, New Jersey: "We have two roofs, one on the top floor with roughly a 3' soffit around the entire roof (little box). The lower roof (big box), has some eaves that extend nearly 8' past the exterior walls and cover a porch. When they built the house, insulation was only placed to the edge of the exterior wall, leaving the entire 8' over the porch uninsulated. Is this normal and/or good practice? Should there be some overlap?"

Answer: Standard practice is to insulate enough to cover the outside of the exterior wall of the home. If the porch is heated, the area above the porch should be completely insulated as well.