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Metal has been a prized roofing material since Roman times, but one reserved for the most expensive of buildings. Changes in technology have made it practical for residential use, making possible quieter, safer, more visually appealing roofs. While the initial cost for a premium metal roof is higher than most other roofing materials, you'll save money in the long run.
A metal roof can last a lifetime, whereas materials like asphalt require reroofing every 10 to 20 years. Another benefit, modern pigments can reflect the heat in infrared light. Pigments with low infrared absorption are called "cool". A "cool" metal roof can save 25% in energy costs compared to a dark-grey asphalt shingle. To get an idea how much energy your roof is absorbing from IR light, check out the graph
Source: Lawrence Berkley National Laboratory