According to the Metal Roofing Alliance, a metal roof will last two to three times longer than a traditional asphalt shingle roof. Metal coatings allow metal roofs to last longer than any other type of roof. A high-quality metal roof will likely be the last roof you'll ever need. Resistant to cracking, shrinking and eroding, metal roofing systems can also withstand extreme weather conditions. Metal roofs are expected to last for the life of the building.