Nails projecting through an open eave can be a visible concern. GAF describes a limited fastening approach for that specific area, rather than shortening nails across the whole roof.
GAF technical bulletin: Fastening methods for open eaves.
What this means for your roof
Nails projecting through an open eave can be a visible concern. GAF describes a limited fastening approach for that specific area, rather than shortening nails across the whole roof.
A useful question for your contractor
Ask how the eave detail will preserve fastening performance and the visible underside.
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.
Read GAF: Fastening methods for open eaves
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.