Granule Loss
The displacement of the protective mineral granules embedded in the surface of asphalt shingles. Granule loss can result from hail impact, foot traffic, manufacturing defect, or normal aging, and it exposes the underlying asphalt to UV degradation.
What Is Granule Loss
Granule loss is the displacement of the ceramic-coated mineral granules that cover the surface of asphalt shingles, and the cause of that loss determines whether it is a covered insurance claim or a maintenance issue. The granules serve two critical functions: protecting the asphalt from UV radiation and providing fire resistance. Once granules are displaced, the exposed asphalt mat degrades rapidly, reducing the remaining useful life of the shingle.
Hail vs. Aging Granule Loss
The key distinction for insurance purposes is causation. Hail-caused granule loss creates random, scattered impact marks where granules were knocked loose by the force of the hailstone. Each mark typically shows a circular area of exposed black asphalt mat, sometimes with a slight dimple or bruise. Age-related granule loss is gradual, uniform, and concentrated along water flow paths and areas of high UV exposure. Adjusters are trained to differentiate the two, and the inspection report should document the pattern that supports the covered cause.
Documenting Granule Loss
Close-up photographs of individual shingles showing the granule displacement pattern are essential. Include a reference object like a coin or chalk circle to show scale. Photograph multiple shingles across different slopes to demonstrate the random distribution pattern consistent with hail. Also photograph the gutters and downspout discharge areas where displaced granules accumulate. Heavy granule deposits in gutters after a storm corroborate the damage claim.
Frequently asked questions
Granule loss caused by hail or storm impact is covered as physical damage. Granule loss from normal aging or manufacturing defect is not covered. The distinction matters: hail-caused granule loss shows a random impact pattern with exposed asphalt, while age-related loss is gradual and uniform.
Hail-caused granule loss appears as random circular or irregular spots of exposed black asphalt mat, often accompanied by a slight indentation or bruise in the shingle. The pattern is random across the roof surface, unlike age-related loss which is uniform and concentrated in areas of water flow.
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