Spray foam over plank sheathing?

Hello,I’m in zone 5A, and am trying to decide how to proceed with updating the insulation of my 100 year old house.I think the house has loose insulation in the… Hello,I’m in zone 5A, and am trying to decide how to proceed with updating the insulation of my 100 year old house.I think the house has loose insulation in the…Read MoreGreenBuildingAdvisor