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Home > Performance Standards for Quality Control > Thermal and Moisture Protection > Observation: Asphalt shingle edges or corners are curled or cupped.

Observation: Asphalt shingle edges or corners are curled or cupped.

Performance Standard: Asphalt shingle edges and corners need not be perfectly flat. Curling or cupping is a defect only if it causes the roof to leak.

Corrective Measure: None