Gutters and Downspouts Can Cause Shingle Damage: GAF Report

shingle damage

In their April 2011 Steep Slope Technical Point Newsletter, GAF addressed damage to shingles from gutters and downspouts when runoff is left unchecked. When gutters and downspouts from an upper roof spill out onto a lower roof, damage can occur to fiberglass-asphalt shingles. They note: