Construction Performance Guidelines
SHADING PATTERN IS VISIBLE ON AN ASPHALT SHINGLE ROOF
At installation, asphalt shingle roofs shall be installed so that any dye lot difference is minimized to provide a uniform roof appearance, when viewed from a normal viewing position on the ground without magnification by reflected light.
One-Year - Work and Materials
Shingles not meeting the acceptable condition shall be repaired.
Shading variations resulting from dye lot difference are acceptable. See Also: 5.13 VARIATION IN COLOUR AFTER REPAIRS (for colour and shading of local repairs).