I am the owner of a 100-year-old two-story house in the 5A climate zone. The house has a full-height attic space, which is currently uninsulated. The attic has actual floor boards in place over the joists, which could be removed, but would be a lot of work. Right now we just use the space as storage, and don't plan to convert it to living space. During the winter i run into huge icicle and ice dam issues. My question is, would it be beneficial to me to insulate the parts of the roof that are accessible(id say 70% is not covered)?