Damage & Failure
What is Cupping?
Roofing Glossary · Damage & Failure
Definition
A specific form of shingle distortion where the edges of a shingle curl upward, making the center appear concave like a cup. Cupping is primarily caused by differential moisture absorption between the top and bottom surfaces of the shingle and is strongly associated with inadequate attic ventilation that traps heat and moisture. Cupped shingles allow wind and water infiltration at the shingle edges.
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