M.B. writes from Milwaukee, Wisconsin: "We have a major problem with icicles hanging from the gutters of our home. There was blown insulation in the attic of our 2 story, 1954 age home. We added additional rolled insulation on top. The snow melts during the sunny day and drips and freezes at night. Do we have not enough insulation or too much insulation on the floor of our attic? Other homes in our neighborhood don't seem to have as much snow melting from their roof and creating this problem. What needs to be done?"

Answer: Check to make sure your attic ventilation is not blocked and that there is an equal amount in the soffit as there is in the roof. You may also have excess warm air infiltrating into the attic from the house via cracks or gaps around electrical and plumbing fixtures. For example, any a pipe, electrical wire or junction box that penetrates the ceiling should be sealed with spray foam or caulk.