Roof algae treatment is a low-pressure application of bio-based cleaner that kills the organism behind the black streaks, Gloeocapsa magma, at the spore level instead of just rinsing away the visible stain. Scrubbing or plain pressure washing strips granules and leaves the colony rooted. Treatment kills it, the streaks fade as the residue weathers off, and the roof stays clean for seasons instead of weeks. Free assessment first, and the method is safe for shingles.
The streaks aren't dirt. The algae feeds on the crushed limestone inside asphalt shingles, holds moisture against the roof surface, and darkens it so the attic runs hotter in summer. That's why a treatment plan beats a scrub: killing the colony stops the feeding, and a prevention cadence matched to the humidity keeps it gone. If your shingles have also gone brittle with age, the same visit tells you whether rejuvenation makes sense. One assessment, both answers.
Wilmington's humidity is why nearly every roof more than a few years old shows streaks, from the Historic District out to Landfall, Ogden, and Porters Neck. Salt haze and shade feed regrowth on north-facing planes first, so we set the re-treatment cadence to this climate, not a national average. Licensed and insured, coastal NC owned and operated. Free, no-obligation quotes.
