The answer to 'shingles curling' is that shingles can curl or buckle for several common reasons, including improper installation, exposure to the elements, or age. Curling shingles are a sign of potential roof problems that need to be addressed.
Some of the main causes of curling shingles include: inadequate attic ventilation leading to excessive heat buildup, poor roof deck preparation, nails not properly securing shingles, or simply old age and weathering. Curled shingles are more susceptible to leaks and damage, so it's important to address the issue promptly.