For those thinking about a metal roof here is good summary and Matt Risinger is the person to listen to if you are looking to renovate or build new. He is always evaluating the next best thing in home construction and provided some good solid advise backed up with data. The house my wife and I are working on building is going to have metal roof, I am tired of asphalt shingle roofs, they never last as long the they claim and can be easily damage in a storm.