Uneven decking, wrinkled underlayment and moisture-related movement can show through shingles. Owens Corning recommends investigating the underlying cause and correcting affected materials where needed.
Owens Corning technical bulletin: Asphalt Shingle Buckling Technical Bulletin.
What this means for your roof
Uneven decking, wrinkled underlayment and moisture-related movement can show through shingles. Owens Corning recommends investigating the underlying cause and correcting affected materials where needed.
A useful question for your contractor
Ask whether the repair addresses the deck and underlayment rather than just the visible wave.
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 edition: August 2023. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
Read Owens Corning: Asphalt Shingle Buckling 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.