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According to facts in a US independent report by the Oak Ridge National Laboratory 2008 ACEEE Summer Study on Energy Efficiency in Buildings, installing a metal roofing system ensures that homeowners save an average of 25 percent of their energy bill. Based on a strapping system of 4 inches between the plywood and the metal on top, homeowners can save up to 40 percent in home cooling costs in the summer, and 10-15 percent in home heating costs