how long do new shingles last
Unfortunately, shingles themselves carry no visible markings that will indicate either the warranty life or date of installation. Suppose that you are buying a 25 year-old house with the original roof. Most roofing shingles come with a 20-year warranty, though the best may have a 30-year warranty. In the case of the 20-year shingle, you may wish to walk around with an umbrella or a prayer shawl after you move into the house; with the 30-year shingle, the only showers you'll have will probably be in the bathroom.