From June through September, the combination of daily thunderstorms, 90-plus-degree heat, and near-constant humidity creates conditions ideal for biological growth on every exterior surface of your Central Florida home.
Mold, algae, mildew, lichen, and moss don’t just look bad — they actively degrade the materials they colonize. Left untreated through a Florida summer, biological growth can shorten the life of your roof by years, stain concrete permanently, and create real health concerns.
5 Types of Biological Growth on Florida Homes
Gloeocapsa Magma (Black Algae on Roofs)
Those dark streaks on your roof shingles are a living cyanobacteria that feeds on limestone filler in asphalt shingles. It spreads by spore and causes accelerated shingle degradation — homes with untreated black streaks can lose five to ten years of roof life. The only safe removal method is soft washing.
Green Algae (Concrete, Driveways, Walkways)
The green film on driveways and pool decks thrives on damp concrete and creates a dangerously slippery surface. Professional driveway and patio cleaning removes algae and restores traction.
Mildew (Siding, Fences, Screened Enclosures)
Mildew appears as white, gray, or brown powdery patches on painted siding and vinyl fencing. It spreads quickly in Florida’s summer humidity and is most common on north-facing walls and shaded areas.
Lichen (Roof Tiles)
Lichen chemically bonds to roof tile surfaces and physically penetrates with root-like structures, causing microscopic damage that compounds over years. It requires professional soft wash treatment.
Moss (North-Facing Walls and Shaded Roof Areas)
Moss retains moisture directly against roofing and siding materials, keeping surfaces wet long after rain — accelerating deterioration of shingles, wood, and grout.
How Soft Washing Eliminates Mold at the Root
Soft washing applies low-pressure cleaning solutions that penetrate the surface, kill organisms at the biological level, and rinse them away. At JBC Pressure Washings, we use Enviro Bio Cleaner — a biodegradable, plant-safe solution effective against algae, mold, mildew, lichen, and moss.
Explore our full range of exterior cleaning services.
Frequently Asked Questions
Q: How quickly does mold and algae come back after cleaning in Florida?
A: With proper soft washing, most surfaces remain clean for one to three years. High-pressure-only cleaning without chemical treatment may see regrowth in weeks.
Q: Is the black streaking on my roof actually damaging the shingles?
A: Yes. Gloeocapsa Magma feeds on limestone in asphalt shingles and degrades them over time, significantly reducing roof lifespan.
Q: What is the best time of year to treat mold and algae on a Florida home?
A: Spring (March–May) is ideal for preventive treatment before the summer rainy season amplifies growth.
Q: Is soft washing safe for all types of roofing?
A: Yes — soft washing is safe for asphalt shingles, concrete tile, clay tile, metal roofing, and most residential roofing materials. It is recommended by many roofing manufacturers as the approved cleaning method.
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