Insulating exhaust ductwork through roof

Hello,We are redoing ductwork in out attic for 2 exhaust fans, one for the bathroom and one for the kitchen range hood.The ductwork for the range hood goes through the… Hello,We are redoing ductwork in out attic for 2 exhaust fans, one for the bathroom and one for the kitchen range hood.The ductwork for the range hood goes through the…Read MoreGreenBuildingAdvisor