Antioch, CA
Roof Cleaning in Antioch, CA
Those black streaks on Antioch roofs are Gloeocapsa magma, an algae that feeds on shingle filler and thrives in Delta humidity. We remove it with a no-pressure soft wash. We never put a pressure washer on a roof, shingle or tile, because pressure destroys both.
Why Antioch roofs streak faster
River damp gives roof algae exactly what it wants: moisture that lingers into mid-morning. Gloeocapsa magma spreads across the north and shaded slopes first, showing up as dark streaks running down the roof. It is not just cosmetic. The algae feeds on limestone filler in comp shingles, shortening roof life. Older roofs in the 94509 core often show years of buildup.
Soft wash only, on every roof type
High pressure strips granules off comp shingles and cracks or displaces the tile common on 94531 homes. We apply a sodium hypochlorite solution at low pressure, let it kill the growth, and let rain and rinsing carry it away. The streaks die immediately and disappear as the dead material weathers off. No walking damage, no blasted granules, no broken tiles.
What a roof cleaning includes
We protect landscaping, treat the full roof surface, and rinse runoff paths so nothing sits on your plants or patio. Gutters catch a lot of the runoff, so many Antioch customers pair roof cleaning with gutter cleaning in the same visit. We also flag anything we see up there, like lifted shingles or slipped tiles, so you hear it from us before it leaks.
Questions We Actually Get
Are the black streaks on my roof mold?
They are algae, specifically Gloeocapsa magma. It feeds on the limestone in shingles and spreads in the damp air Antioch gets off the Delta. Soft washing kills it completely.
Will you walk on my tile roof?
We minimize roof contact and never drag pressure equipment across tile. Tile cracks under concentrated weight, so we work from edges, ladders, and lifts wherever possible.
How long does a roof cleaning last in Antioch?
Typically two to four years. Shaded homes near the river regrow faster than sun-exposed roofs in the southeast subdivisions, and we can put you on a schedule that matches your exposure.
Ready to make it look new again?
Fast scheduling. Photo-documented results. A written quote before any work starts.