Two warranties
Manufacturer covers the product. Workmanship covers the install.
Manufacturer warranty. Covers defects in the shingle itself — premature granule loss, delamination, a manufacturing fault. It comes from GAF, not from us, and it survives regardless of what happens to any contractor.
Workmanship warranty. Covers the installation — flashing detail, fastening, valley construction, ventilation. It comes from the contractor who did the work.
Here’s why the distinction matters: the overwhelming majority of new-roof failures are installation failures, not product defects. So the warranty that’s most likely to matter is the one backed by whoever installed it. If that company has moved on to the next storm, that warranty is a piece of paper.