Staggering courses keeps joints from aligning in vulnerable positions. GAF explains offsets as a product-specific installation requirement, not a decorative preference.
GAF technical bulletin: Shingle offsets.
What this means for your roof
Staggering courses keeps joints from aligning in vulnerable positions. GAF explains offsets as a product-specific installation requirement, not a decorative preference.
A useful question for your contractor
Ask for course layout that follows the selected shingle’s instructions.
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 revision: February 1, 2021. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
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.