Sam writes from Senecaville, Ohio: "I have a metal roof over 3/4" stringers, not a lot of metal showing. However, in the winter my roof condensates and drips. There is plenty of insulation laying on top of my ceiling rolled insulation, vapor side down and blown in over top. What can I use as a vapor barrier. I know that I'll have to unscrew and remove the metal to apply. Any suggestions?"

Answer: It sounds as though there is already a vapor barrier on the rolled insulation, and that adding ventilation is what is needed here. There is information on the Owens Corning Web site that will help you determine the amount of ventilation you need.