Why Aluminum Gutters and Flashing Can Corrode
Bulletin revision: February 1, 2021
Moisture, contact with dissimilar materials and collected debris can contribute to corrosion. GAF discusses copper-related interactions with aluminum and why drainage and material selection matter.
GAF technical bulletin: Corrosion of aluminum gutters and flashings.
What this means for your roof
Moisture, contact with dissimilar materials and collected debris can contribute to corrosion. GAF discusses copper-related interactions with aluminum and why drainage and material selection matter.
A useful question for your contractor
Ask whether flashing and gutters are compatible and whether water or granules are collecting at vulnerable points.
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 revision: February 1, 2021. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
Read GAF: Corrosion of aluminum gutters and flashings
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.