Your roof shingles are losing granules due to a combination of natural aging, environmental exposure, and potentially mechanical damage. Asphalt shingles are coated with ceramic-coated mineral granules that protect the underlying asphalt from UV radiation, provide fire resistance, and give color. During the first year after installation, some initial shedding of loose granules is normal as extra granules not fully embedded wash off. As shingles age, especially after 15 years, the asphalt binder that holds granules weakens due to UV exposure, thermal cycling, and loss of volatile oils, causing gradual granule loss that accelerates over time. Hail impact is a common cause of sudden granule loss, where hailstones knock granules off and create bruising with distinct circular patterns. Foot traffic from walking on the roof, falling branches, and debris abrasion also dislodges granules. Poor attic ventilation causes excessive heat buildup that softens asphalt and loosens granules faster. Age-related loss shows as uniform thinning across the roof, especially on south and west facing slopes with more sun, while heavy accumulation of granules in gutters and bald black spots where asphalt is exposed indicates advanced loss. Never pressure wash shingles, as high pressure strips granules severely. If granule loss is extensive with many bald spots, the roof is near end of life and UV protection is compromised.
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