Moss on a roof is not just a cosmetic problem. It feeds on shingle materials, lifts edges, and traps moisture that causes leaks. That is why roof cleaning services matter before moss spreads far enough to cause repairs that cost thousands of dollars. What Does Moss Actually Do to Your Shingles? Moss causes both biological and physical damage at the same time. How Does Moss Feed on the Limestone Inside Asphalt Shingles? Most asphalt shingles contain limestone fillers that add