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"  Q: My roof shingles were recently damaged by hail. My insurance company will pay only for replacing the damaged shingles, not the entire three-year-old roof. Can I just put a second layer on top of the shingles, or must they be removed first? Also, what would happen if I did nothing except replace the bad shingles? A: Since the shingles are only a few years old, you can just replace the bad ones. That&amp;#039;s the best and least expensive solution -- if the damage is confined to a small number of areas. However, if the damage extends over a large section, then you&amp;#039;re better off covering the roof anew. Contact your local building department to find out whether a permit is required and how many layers of roof shingles are allowed. Often, two layers is fine, so you probably won&amp;#039;t have to strip off the existing shingles. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/home/outdoor-projects/how-to/a1499/4213453/>