Those black streaks aren't dirt
The dark stains creeping down South Florida roofs are a living organism — Gloeocapsa magma algae — thriving in our heat and humidity. Left alone it spreads, holds moisture against the roof, and on shingle roofs actually consumes the granules, shortening the roof's life.
- Removes black algae streaks, mold, mildew and moss.
- Soft-wash (low pressure) — safe for tile, shingle and metal.
- Restores curb appeal and helps with HOA appearance standards.
- Reflective, clean surfaces run cooler than algae-darkened ones.
- A cleaning is also a chance to spot developing roof problems early.
Why never to pressure-wash a roof
High-pressure washing strips the protective granules off shingles and can crack or dislodge tile and force water under it — turning a cosmetic job into roof damage. We only soft-wash: a low-pressure treatment that kills the algae at the root so it stays gone longer, without harming the roof you're trying to protect.
Related roofing guides
Frequently asked questions
Soft-wash roof cleaning typically runs $350–$900 for most homes — roughly $0.20–$0.60 per square foot — depending on roof size, pitch, material and how heavy the algae growth is. We give a free quote after a quick look at the roof.
Not the way we do it. We use a low-pressure soft-wash method, never high-pressure blasting. Pressure-washing strips shingle granules and can crack tile or drive water underneath — soft-washing cleans safely and keeps the algae from returning as quickly.