1.5 story cathedral ceiling fool proof simple exterior roof insulation amount and type. Do I have to fill insulation cavity completely?

Hello! I’ve in a 1.5 story cape built in 1944 near Albany, NY zone 5b with cathedral ceilings on second floor. The house is in the shape of an L… Hello! I’ve in a 1.5 story cape built in 1944 near Albany, NY zone 5b with cathedral ceilings on second floor. The house is in the shape of an L…Read MoreGreenBuildingAdvisor