Owens Corning accepts ZIP System sheathing subject to deck, installation, ventilation and code conditions. Underlayment remains required in specified low-slope and reroof situations and for extended warranties
Owens Corning technical bulletin: Zip System Technical Bulletin.
What this means for your roof
Owens Corning accepts ZIP System sheathing subject to deck, installation, ventilation and code conditions. Underlayment remains required in specified low-slope and reroof situations and for extended warranties. The sheathing’s integrated surface is not a universal substitute for every roof-system layer.
A useful question for your contractor
Ask which underlayment requirements apply to your slope, reroof conditions and warranty choice.
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: August 2025. The date shown identifies the manufacturer document used for this summary.
Read Owens Corning: Zip System Technical 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.