Did you know traditional asphalt shingles are a petroleum product and require replacement every 15-20 years (or sooner), resulting in about 20 billion pounds of asphalt shingles ending up in U.S. landfills every year? According to industry data, roughly 7 million U.S. homeowners replace their roof each year and many are looking for new ‘green’, energy-saving options. Here’s what you should know about metal.