Vapor permeability

Good morning, my name  is Lee and I have been remodeling a 1970s farm house about 30 miles southeast of Des Moines Iowa( Climate Zone 5). I have attached a… Good morning, my name  is Lee and I have been remodeling a 1970s farm house about 30 miles southeast of Des Moines Iowa( Climate Zone 5). I have attached a…Read MoreGreenBuildingAdvisor