Exterior Insulation to 1976 home in Climate Zone 6

Hello,Located in MN, my house is 2×4 wall construction with a poly barrier on the interior behind drywall. The sheathing is a 1″-1.125″ thick fiberboard, which I believe has an… Hello,Located in MN, my house is 2×4 wall construction with a poly barrier on the interior behind drywall. The sheathing is a 1″-1.125″ thick fiberboard, which I believe has an…Read MoreGreenBuildingAdvisor