Construction Performance Guidelines
ASPHALT SHINGLE EDGES ARE CURLED OR CUPPED
Asphalt shingle edges and corners need not be completely flat. Edges and corners that curl or cup to expose the uncoloured portion of the shingle below are not acceptable.
One-Year - Work and Materials. · Damage resulting from normal wear and tear is not covered by the statutory warranty.
Shingles not meeting the acceptable condition shall be repaired.
Adequate attic ventilation is necessary to prevent excessive solar heat buildup in the attic that can contribute to curling and cupping. Shingles on top of flashing may not adhere and can lift. See Also: 5.5 INADEQUATE ATTIC VENTILATION