Damage & Failure
What is Curling?
Roofing Glossary · Damage & Failure
Definition
A shingle defect where the edges or corners of shingles turn upward (cupping) or the center of the shingle lifts while the edges remain flat (clawing). Curling is caused by moisture imbalance in the shingle layers, improper installation, inadequate attic ventilation, or age-related shrinkage of the asphalt mat. Curled shingles are susceptible to wind uplift and allow water to enter the joints between courses.
Related Roofing Terms
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CuppingA specific form of shingle distortion where the edges of a shingle curl upward, making the center ap...
→Granule LossThe shedding of mineral granules from the surface of asphalt shingles due to weathering, manufacturi...
→Wind UpliftThe aerodynamic force that acts upward on a roof surface, particularly at corners, edges, and ridge ...
→Blow-OffThe loss of shingles or roofing material from the roof surface due to wind forces exceeding the inst...
→Asphalt ShinglesThe most widely installed residential roofing material in North America, consisting of a fiberglass ...
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