Two year old roof 2 on 12 pitch, history of ice damming before and after roof replacement. Is this too much degranulation, is it telling a story?
My recommendation will include replacing shingles with BUR or some other waterproof roofing product, it seems that shingles just aren’t going to work for this roof. Half of it is cathedral ceiling fastened to the bottom of the 2X6 rafters. Nasty looking fiberglass insulation, which I could see, because some induhvidual had put a turbine ventilator on it. One good thing (only good thing) about those whirlies is that you can remove the hat and get a good look at whats inside