The black streaks aren't dirt. They're eating your roof.
That dark staining is gloeocapsa magna — an algae that feeds on your roofing material and holds moisture against it. Cleaning it off is maintenance, not vanity.
In South Florida's heat and humidity, every roof eventually grows things: algae streaks on shingle, black and green film on tile, mildew on flat sections shaded by trees. Beyond looking terrible, that growth holds moisture against the roof surface, feeds on limestone filler in shingles, adds weight, and accelerates aging. HOAs write letters about it; insurance inspectors photograph it. Regular cleaning genuinely extends roof life — but only when it's done with the right method for the material.
That's the catch: high-pressure washing is how amateurs destroy roofs. Blasting shingles strips the granules that protect the asphalt; hammering tile cracks it and drives water under the laps; high pressure at the wrong angle lifts flashings. We clean the way manufacturers specify — soft wash for shingle and most tile, using low pressure and detergents that kill the algae at the root so it stays gone longer, with pressure reserved for the surfaces that can take it, like concrete flat work and some walkable tile.
Because our cleaning crews are roofers, every wash doubles as an inspection: cracked or slipped tiles, lifted shingles, soft decking, failed sealant, and clogged valleys get spotted and photographed while we're up there. Small problems found during a cleaning become cheap repairs instead of next year's leak. It's an honest way to keep a tile roof looking new for decades — and the written estimate is free.
Roof cleaning services.
Straight answers.
Ask us anything else at (954) 710-0603 — Stanley picks up.
High pressure on shingle or tile, yes — it strips granules and cracks tile. Soft washing with the right detergents at low pressure is the manufacturer-approved method, and it's what we use on those surfaces.
Every 2–3 years for most homes, sooner for heavily shaded roofs. Soft wash treatments keep algae away longer than pressure alone because the detergent kills the growth at the root.
Yes — algae and mildew hold moisture against the surface and feed on roofing materials. Removing them, plus the inspection that comes with every wash, is some of the cheapest roof maintenance there is.
Done wrong, absolutely — walking tile carelessly cracks it, and high pressure forces water under the laps. Our crews are tile roofers first, so they know where to step and what pressure each surface takes.
Get your free written estimate.
A detailed inspection and a line-item price within 24 hours — no pressure, no obligation.