Owens Corning Coverage for Sealed and Unvented Attics
Bulletin dated: August 2023
The bulletin separates standard manufacturing-defect coverage from damage associated with inadequate ventilation. It also says unvented or sealed assemblies do not qualify for the listed extended warranties
Owens Corning technical bulletin: Warranty Coverage of Shingles Over Unvented Decks and Sealed Decks Technical Bulletin.
What this means for your roof
The bulletin separates standard manufacturing-defect coverage from damage associated with inadequate ventilation. It also says unvented or sealed assemblies do not qualify for the listed extended warranties. A statement that the shingle warranty remains valid can therefore omit important differences in the coverage level.
A useful question for your contractor
Ask for written confirmation of the exact warranty available for the proposed attic 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: August 2023. The date shown identifies the manufacturer document used for this summary.
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.