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Asphalt shingles have a temperature-sensitive tar strip that seals them together. It helps to keep them from blowing off in high winds. In the afternoon, when they are warm or hot, the tar strip is stuck fast. That makes them nearly impossible to get apart without tearing. But first thing in the morning, when the roof is still cool, the tar strip is somewhat brittle. At that time, you can separate them with a flat pry bar, or paint scraper.