It is algae
The dark streaks are usually Gloeocapsa magma, an algae that feeds on the limestone filler in asphalt shingles.
Those black streaks are algae, and they come off. We soft wash asphalt shingle and metal roofs with low pressure and a metered cleaning solution, so the streaks are gone, your shingles stay intact and your landscaping stays safe.
BeforeAfter
It is not dirt, and it is not your shingles wearing out. It is a living algae, and it keeps spreading until it is killed.
The dark streaks are usually Gloeocapsa magma, an algae that feeds on the limestone filler in asphalt shingles.
Humidity and shade feed it. It shows up first on the north side, under trees and on the slopes that stay damp longest.
It grips the shingle surface and spreads across the roof. A soft wash kills it at the root, and the streaks wash away.
A pressure washer can strip a roof faster than the weather ever will. Soft washing cleans it the safe way.
The most common roof in Sumner County and the one black streaks love. Soft washing removes them without knocking granules loose.
We remove the chalky, faded film, dirt and algae and bring back the original color of the panels.
Multi-level homes are a specialty, not a problem. We reach the high peaks and back slopes other companies skip.
Pair your roof wash with gutter cleaning so water drains clean when the job is done.
Black streaks make a roof look years older than it is. Plenty of Hendersonville homeowners get quotes for a new roof when all it needed was a cleaning.
Roof cleaning runs off into your beds and lawn, so we treat the yard as part of the job. Plants get soaked before we start, rinsed while we work and rinsed again when we finish.

Every roof is quoted on its own. Three things set the price:
Send a photo of your roof and get an exact number. Estimates are always free.
Wash Wizard is owned and run by David. He prices every roof himself, shows up on time, and is careful with your property from start to finish.
We accept cash, Venmo, credit and debit cards, and check.
Straight answers about soft washing your roof. Have more questions? Read the full FAQ.
Algae. The most common type, Gloeocapsa magma, feeds on the limestone filler in asphalt shingles and shows up as dark streaks, usually on the north and shaded sides of the roof. It is not dirt, and rain will not wash it off. A roof soft wash kills it and the streaks come off.
Yes. We never pressure wash a shingle roof. Low-pressure soft washing cleans without knocking granules loose, and we protect every plant before, during and after.
Clean it first. Black streaks make a roof look older than it is, and plenty of homeowners replace roofs that only needed cleaning. A soft wash costs a small fraction of a new roof, and once the roof is clean any real damage is easy to see.
Yes. We wash metal roofs to remove the chalky, faded film, dirt and algae and bring back the original color.
No. Our soft wash system meters cleaning agents down to 1/10th of a percent, and we pre-soak and rinse your plants before, during and after every job.
Based in Hendersonville and cleaning roofs throughout the area, including:
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