Poly Iso behind Rockwool?

We are remodeling our 1900s-ish house.  The exterior walls are built with 4″ dimensional lumber and we are adding insulation.  We were planning on using rockwool but that is only… We are remodeling our 1900s-ish house.  The exterior walls are built with 4″ dimensional lumber and we are adding insulation.  We were planning on using rockwool but that is only…Read MoreGreenBuildingAdvisor