Heat, pressure, moisture and long storage can affect bundles before they reach the roof. GAF recommends stock rotation, appropriate protection and product-specific stacking
GAF technical bulletin: Proper shingle storage.
What this means for your roof
Heat, pressure, moisture and long storage can affect bundles before they reach the roof. GAF recommends stock rotation, appropriate protection and product-specific stacking. Visibly damaged or flood-exposed shingles should not be installed.
A useful question for your contractor
Ask whether delivered bundles have been inspected before the roof is opened.
Ask for the answer to be tied to the actual roof condition and the exact product being installed. Keep the agreed repair or installation detail with your estimate and project photos.
Bulletin dated: January 27, 2025. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
Read GAF: Proper shingle storage
This homeowner summary explains the cited bulletin. The complete manufacturer document and current product instructions govern the installation details. A requirement for one manufacturer or product should not be transferred to another without checking.