Wear Pattern
The visible signs of gradual material deterioration on a roof surface from aging, UV exposure, and weather cycling. Wear patterns include uniform granule erosion, curling edges, and color fading that distinguish normal aging from sudden storm damage.
What Is a Wear Pattern
A wear pattern is the cumulative visible evidence of normal aging and environmental exposure on a roof surface, including uniform granule erosion, edge curling, color fading, and surface cracking, and it establishes the baseline condition against which storm damage is measured. Every roof develops wear patterns over time. The rate depends on climate, ventilation, material quality, and installation workmanship. A 15-year-old roof in Phoenix shows different wear patterns than a 15-year-old roof in Minnesota, but both are aging.
Common Wear Patterns
Granule erosion along water flow paths shows as lighter-colored streaks where water channels down the shingle surface. Edge curling starts at the lower exposed edge of the shingle tab and progresses inward. Color fading is most pronounced on south and west facing slopes with the most UV exposure. Moss and algae growth occurs in shaded, moisture-retaining areas. Cracking follows the fiberglass mat grain as the asphalt becomes brittle with age. Each pattern tells a story about the roof's age and condition.
Wear Patterns and Depreciation
Adjusters use wear patterns to support depreciation rates in the estimate. A roof with heavy wear receives higher depreciation, which reduces the ACV payment. Contractors should understand that wear patterns are documented during the initial inspection and are part of the record. The goal is not to argue that wear does not exist but to ensure the adjuster distinguishes between pre-existing wear and new storm damage. Clear documentation of both conditions, with separate photographs, protects the claim from having legitimate storm damage dismissed as pre-existing wear.
Frequently asked questions
A wear pattern is the visible evidence of gradual aging and deterioration across a roof surface. Common wear patterns include uniform granule loss along water flow paths, curling at shingle edges, color fading on sun-exposed slopes, and moss or algae growth in shaded areas. These patterns develop over years, not during a single storm event.
Wear patterns directly affect depreciation calculations. A roof showing significant wear will receive higher depreciation rates, reducing the ACV payment. Adjusters document pre-existing wear to establish the roof's condition before the covered event. Wear itself is not covered, but storm damage on a worn roof is covered, minus the depreciation that reflects the wear.
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