Those dark streaks on your shingles usually come from Gloeocapsa magma, a blue-green algae—not dirt or old age. Here's how to handle it safely.
Have a question about your roof?
Talk to a local roofing expert. Estimates are always free.
Get a Free QuoteNeed expert roofing help?
NearMe Roofing Company has decades of experience serving Seattle and the greater Puget Sound region.