Those black streaks are eating the roof.
The dark streaks on the roof aren't just dirt. They're caused by Gloeocapsa magma, a cyanobacterium that feeds on the limestone filler in the shingles. It thrives in North Carolina's warm, humid climate and is actively deteriorating the roof: reducing reflective properties, increasing cooling costs, and shortening the roof's lifespan by years.
Why you should never pressure wash a roof
Every major shingle manufacturer (GAF, CertainTeed, Owens Corning, and Atlas) explicitly warns against pressure washing. High pressure strips the protective granules from the shingles, which voids the warranty and accelerates the damage. Soft washing is the only approved method.
How roof soft washing works
We apply a specialized, biodegradable cleaning solution at low pressure. This solution breaks down and removes the algae, lichen, and moss at the cellular level. The roof then rinses clean naturally with rainfall over the following days, though most improvement is visible immediately.
How long do results last?
Roof soft washing results typically last 3-5 years depending on shade coverage, tree proximity, and which direction the roof faces. North-facing slopes in heavy shade will need attention sooner. We'll give you an honest assessment for the specific roof.