Damage & Failure
What is Granule Loss?
Roofing Glossary · Damage & Failure
Definition
The shedding of mineral granules from the surface of asphalt shingles due to weathering, manufacturing defects, or impact. Minor granule loss is normal on new shingles, but significant loss — visible as bald spots or large accumulations in gutters — exposes the underlying asphalt to UV radiation, dramatically accelerating shingle aging. Widespread granule loss is a primary indicator that shingles need replacement.
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