My wife's and my plan this Fall was to put in new windows on the second floor and replace some cedar shingles on the walls . . . but that changed when I was up on the roof the other day and discovered that a number of the 30-year asphalt shingles are in really rough shape (the granules falling right off just by running my hand over some of them and exposing the backing). I'm a little perplexed as to how this has happened . . . unless 30 year shingles are in actuality only really good for that time in an ideal situation as they have been on the roof for 17 years. My only other line of thinking is that where the worse damage is located is at the point where the snow collects and sits as the roof line transitions from a steep point to the less pitched porch roof . . . OR . . . maybe it's because I insulated the knee wall void space and there are no vents in that area? -- In any case, besides wondering about the cause of this failure . . . I am also looking for opinions on metal roofing. I am leaning towards standing seam . . . but I'm also getting a quote from the local Amish family that sells and puts up the "old" screw in style of roof.