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As asphalt shingles age they get brittle so when a strong wind blows one backwards you have a torn shingle tab. The cause for lots of roof leaks. To replace the damaged shingle you have to first separate it from those above and below it with a flat bar. Then pry up the nails to completely remove it. Now you’re ready to put a new shingle back in its place. You’ll need to nail it down using two nails in the top half of each tab and then add a little roofing cement on top of each nail. This will correct the problem for now but it doesn’t mean your troubles are over. If this shingle was brittle enough to break, that means that others may be too and the roof is nearing the end of its life.