Synthetic Underlayment and Plastic Cap Fasteners
Bulletin dated: February 26, 2026
GAF strongly encourages plastic-cap fasteners. Its limited uncapped-fastener exception requires all stated conditions, including code compliance, same-day roof covering, suitable weather and slope below 6:12.
GAF technical bulletin: Installing synthetic underlayments without plastic cap nails or staples.
What this means for your roof
GAF strongly encourages plastic-cap fasteners. Its limited uncapped-fastener exception requires all stated conditions, including code compliance, same-day roof covering, suitable weather and slope below 6:12.
A useful question for your contractor
Ask why an exception is proposed and how every condition will be met.
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: February 26, 2026. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
Read GAF: Installing synthetic underlayments without plastic cap nails or staples
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.