Thanks! I'll look it up!
The past couple of days I've been removing the fiberboard and insulation from the walls and ceiling. I'm finding large sections that were never insulated at all, and much of the ceiling insulation had been "rearranged" by nesting squirrels over the years. There was also a gable vent that had been covered over years ago when the outside was refaced. Small wonder ice dams were such a consistent problem!
Pete