I believe that you can get ARC approval for the metal roofs that look like shingles, however, the last time i checked these were 2 to 3 times more expensive. This was a quick check and NOT a detailed estimate. Here is my point, our roof is just over 9 years old, in theory, we will get 5 or 6 more years out of it before replacement. At that point a new shingle roof will probably outlive both of us. So, the investment in a metal roof goes to the future buyer or whomever inherits the house.
The metal roof would be a great option for the original roof, or if you are a younger buyer/owner. I will continue to follow this, to see the possible impact on insurance rates, and installation costs.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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