This bulletin explains the trough, cut line, offset and fastening requirements for a closed-cut valley. Its text and drawing differ on cement-bed width, so that detail needs manufacturer clarification before use.
Owens Corning technical bulletin: Closed Cut Valley Technical Bulletin.
What this means for your roof
This bulletin explains the trough, cut line, offset and fastening requirements for a closed-cut valley. Its text and drawing differ on cement-bed width, so that detail needs manufacturer clarification before use.
A useful question for your contractor
Ask the installer to resolve the discrepancy instead of choosing a dimension without confirmation.
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: April 3, 2020. The bulletin header is April 3, 2020; the supplied PDF edition was printed in August 2023.
Read Owens Corning: Closed Cut Valley 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.