Factory sealant may need help in specific installation or repair conditions. GAF provides product-specific hand-sealing guidance using compatible asphalt roof cement
GAF technical bulletin: Hand sealing shingles.
What this means for your roof
Factory sealant may need help in specific installation or repair conditions. GAF provides product-specific hand-sealing guidance using compatible asphalt roof cement. Too much cement can create its own problems.
A useful question for your contractor
Ask which shingles need hand-sealing and which product instructions govern the repair.
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: April 17, 2024. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
Read GAF: Hand sealing 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.