GAF describes laboratory wind classifications and their relationship to roofing requirements. A test classification, a warranty promise and a building's required design resistance are different things.
GAF technical bulletin: Wind resistance of asphalt shingles.
What this means for your roof
GAF describes laboratory wind classifications and their relationship to roofing requirements. A test classification, a warranty promise and a building’s required design resistance are different things.
A useful question for your contractor
Ask which product rating and installation requirements apply to your roof.
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: January 25, 2021. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
Read GAF: Wind resistance of asphalt shingles
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.