For starters, they encompass a minimum of 25 p.c recycled supplies and are one hundred pc recyclable themselves. Finally, in some re-roofing tasks, a metallic roof is so light—roughly one-third the weight of asphalt—that it may be installed immediately overtop asphalt shingles without overburdening the roof’s structural support. This strategic move saves the trouble and sheer waste of ripping off the old roofing and sending it to a landfill. Although most steel roofing merchandise carry warranties comparable to the very best asphalt shingles, in follow, metal roofs have been identified to last 50 years or extra. According to State Farm …