Rare shingles containing a fiberglass-mat splice can show severe localized granule loss, tearing or distortion. GAF says affected shingles should be replaced rather than assuming the whole roof has the same problem.
GAF technical bulletin: Splices on asphalt shingles.
What this means for your roof
Rare shingles containing a fiberglass-mat splice can show severe localized granule loss, tearing or distortion. GAF says affected shingles should be replaced rather than assuming the whole roof has the same problem.
A useful question for your contractor
Ask for isolated defects to be documented for the manufacturer’s review.
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: April 4, 2025. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
Read GAF: Splices on 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.