GAF describes amended accessory requirements for eligible LayerLock systems using full-deck leak barrier. Ventilation and moisture-control design remain important, and coverage depends on the actual warranty terms.
GAF technical bulletin: Full deck coverage with leak barrier & windproven™ limited wind warranty.
What this means for your roof
GAF describes amended accessory requirements for eligible LayerLock systems using full-deck leak barrier. Ventilation and moisture-control design remain important, and coverage depends on the actual warranty terms.
A useful question for your contractor
Ask for the complete accessory list and written eligibility for the proposed assembly.
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: May 11, 2026. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
Read GAF: Full deck coverage with leak barrier & windproven™ limited wind warranty
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.