Curled shingles are asphalt shingles that have physically distorted from their original flat shape into a curved, lifted, or wavy form, and they are a clear sign of aging or ventilation problems. There are two main types of curling. Cupping is when the edges of the shingle turn upward, creating a concave shape like a cup, which occurs when the top surface of the shingle shrinks faster than the bottom due to UV exposure and loss of protective oils. Clawing is the opposite, where the middle of the shingle rises and edges stay flat, often caused by moisture absorption in the shingle mat from below due to poor attic ventilation. Curled shingles no longer provide a flat, water-shedding surface. The lifted edges allow wind to get underneath, making them highly vulnerable to wind blow-off, and they allow wind-driven rain to infiltrate under the shingle, leading to leaks, deck rot, and interior damage. Curling is most common on roofs that are 18 to 25 years old and have reached end of life, but it can occur earlier if attic ventilation is inadequate, causing excessive heat buildup that cooks shingles from below. A few curled shingles can be temporarily glued down with roofing cement, but widespread curling across the roof means the shingle system has failed and needs complete replacement with proper ventilation correction.
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