Some granule loss is normal on a new roof and after heavy storms. The warning pattern is volume plus company: handfuls of granules at every downspout, shingles that look smooth or sparkle with exposed fiberglass, and brittle tabs that crack when lifted. Granules are the shingle's sun and weather armor; a roof shedding them across all slopes is aging out, while one bare patch below a valley is a local wear point worth a repair look.
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