I had weather damage 7 years ago and my insurance company paid for a new roof. I had already replaced one roof 20 years earlier and did most of the work myself. The cost to put metal over shingles with no tear off worked out close enough to the same price as tearing off the old shingles and replacing with new. Seemed like a no-brainer to me. My roofer used furring strips and cut the vent pipes flush with the roof. Everything vents just as well as before and there are no holes in the roof for them. I've been very happy with the results and have noted lower heating and cooling costs as well. This roof will last the rest of my life. Had I gone with shingles I'd be doing it again in another 15-20 years. I hope I live another 20-25 years.
