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Shingles can curl either upwards or downwards (causing a bump on their bottom edge) – either way, it’s a sign of trouble.  Any distortion in the shingles, such as a buckled vertical line, can indicate a problem. There are several causes of buckling, including using boards that are too thin when constructing the roof. Sagging centers or ridges can also be signals that it’s time to consider reroofing. Pay special attention to any area where one surface meets another, such as near chimneys, vents, or wall joints. If you notice any cracks, dried out caulking or rusty metal, there’s a problem with the flashing. Again, this is a potential leak that may be cause for roofing repair.