What often causes small dimples or circular depressions on asphalt shingles?

The presence of small dimples or circular depressions on asphalt shingles is most commonly attributed to the impact of hailstones. When hail falls, particularly during intense storms, it can strike the surface of the shingles with force, causing indentations that resemble small craters or circular depressions. This type of damage is particularly significant as it can compromise the integrity of the shingles, leading to potential leaks and reducing their lifespan.

Hail damage is typically marked by these distinct dimples, which differ in appearance from other types of wear and tear associated with shingles. For instance, while wind can dislodge shingles or cause them to lift, it does not typically produce the circular depressions seen with hail impact. Similarly, tree branches can cause scratches or larger dents if they fall on roofs, but they do not create the small, round indentations characteristic of hail damage. Debris accumulation can lead to roof problems, but it does not directly cause dimpling in shingles. Therefore, the damage being described more accurately points to the effects of hailstones on asphalt roofing materials.