The answer to 'why is my architectural shingles curling shingles' is that architectural shingles can curl for several common reasons, including improper installation, exposure to extreme weather, or aging. Curling shingles can allow water to seep under the roof, leading to leaks and damage.
Some of the most common causes of curling architectural shingles include: poor attic ventilation causing heat buildup, incorrect nailing or overlapping, old age and weathering, and extreme temperature changes. Symptoms include shingles lifting at the edges or in the middle, and the shingle tabs no longer lying flat against the roof.