Continuous insulation on existing homes

I reside and work in Colorado in Climate Zone 7. Polyethylene sheathing is typically used as a class I vapor retarder under the drywall in existing homes. When able to… I reside and work in Colorado in Climate Zone 7. Polyethylene sheathing is typically used as a class I vapor retarder under the drywall in existing homes. When able to…Read MoreGreenBuildingAdvisor