The answer to 'why is my asphalt shingles clogged gutters' is that clogged gutters are a common problem caused by debris from asphalt shingles. Over time, the granules on asphalt shingles can break down and get washed into the gutters, causing them to become blocked. This prevents proper drainage and can lead to water damage, leaks, and even roof deterioration.
Clogged gutters from shingle debris are especially common on older roofs where the shingles are starting to wear down. Symptoms include water overflowing the gutters during rain, gutters sagging or pulling away from the roof, and water stains or damage on the exterior walls below the gutters.