What is the wearing on shingle roofs called?

The wearing, shedding, or erosion of the top protective layer on asphalt shingles is called granular loss. These crushed, stone-like particles protect the shingle’s asphalt base from UV rays and weather. Significant loss results in “bald” or exposed, shiny spots that reduce the roof’s lifespan. 

Key Aspects of Granular Loss:

• Cause: Normal aging, extreme weather (hail/wind), or manufacturing defects.
• Signs: Granules in gutters, bald/shiny spots, or discolored/faded shingles.
• Impact: Leaves shingles brittle, leading to cracking, curling, and potential leaks.
• Result: Reduced roof lifespan, potentially aging 2–5 years faster. 

While minor shedding is normal for new roofs, excessive loss often indicates the roof is nearing the end of its life.