Converting a Vented Attic to an Unvented Attic

Hi! I’m about to get a new roof, and I’m planning to add 2” of exterior rigid polyiso foam insulation on top of the existing roof sheathing. This is primarily to… Hi! I’m about to get a new roof, and I’m planning to add 2” of exterior rigid polyiso foam insulation on top of the existing roof sheathing. This is primarily to…Read MoreGreenBuildingAdvisor