Self-Adhered Underlayment Over Fire-Treated Plywood
Bulletin dated: December 2024
Owens Corning notes that fire-treated plywood surfaces vary and initial adhesion may be uncertain. Its bulletin recommends backnailing for installer security and describes warranty treatment for its listed self-adhered products
Owens Corning technical bulletin: Installation OC S.A. Underlayments Over Fire Resistant Treated Tech Bulletin.
What this means for your roof
Owens Corning notes that fire-treated plywood surfaces vary and initial adhesion may be uncertain. Its bulletin recommends backnailing for installer security and describes warranty treatment for its listed self-adhered products. A membrane’s adhesive alone should not be assumed to provide the same hold on every treated panel.
A useful question for your contractor
Ask how initial attachment will be secured on the actual treated sheathing.
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: December 2024. The date shown identifies the manufacturer document used for this summary.
Read Owens Corning: Installation OC S.A. Underlayments Over Fire Resistant Treated Tech Bulletin
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.