Submersion can affect sealing, granule adhesion, strength and other performance attributes. Owens Corning says flood-submerged shingles are not suitable for sale and recommends recycling
Owens Corning technical bulletin: Flood Damaged and Submerged Shingles Technical Bulletin.
What this means for your roof
Submersion can affect sealing, granule adhesion, strength and other performance attributes. Owens Corning says flood-submerged shingles are not suitable for sale and recommends recycling. Its bulletin also states that flood exposure removes warranty coverage for the affected material.
A useful question for your contractor
Ask whether stored roofing materials were exposed to floodwater and verify the replacement material’s source.
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 2019. The date shown identifies the manufacturer document used for this summary.
Read Owens Corning: Flood Damaged and Submerged Shingles 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.