[Umby]

I have a ranch built in 1951 that has no overhang/sofits (i.e the roof just ends at the top of the exterior wall). Because of winter ice dams and summer overheating in the attic, I would like to build out sofits by extending and boxing-in the rafters, get rid of the can vents, and cut in ridge vents. Does this sound like overkill? Any tips or sites I should visit? Thanks