Roof Algae: What Is That Stuff On My Roof?
July 8, 2009
As asphalt and fiberglass shingles age, they can sometimes develop streaks of discoloration. This is especially prevalent in damp climates or shaded areas. While these streaks are often seen as a sign of aging of the roof, they are actually biological growth. As dirt accumulates on standard shingles over time, it gets stuck in the… ( read more )