Maumee, OH / Storyteller / Jun 18, 2026 /
Those dark streaks creeping across thousands of Northwest Ohio rooftops are usually not dirt, soot, or a sign of a failing roof; they’re caused by a tiny microorganism living on the roofs. But that doesn’t mean they’re harmless or can be ignored, either. Frogtown Roofing, one of the region’s highest-rated roofing contractors, has published a comprehensive new homeowner guide addressing one of the most misunderstood roofing issues in the area: Black Streaks on Your Roof? Why NW Ohio Homes Get Algae and How to Fix It.
The guide is of special value to homeowners across Perrysburg and Toledo, two communities where the combination of a mature tree canopy, humid summers, frequent rainfall, and north-facing roof slopes creates near-ideal conditions for Gloeocapsa magma, the airborne cyanobacteria responsible for the dark streaking pattern on asphalt shingles across the region…