Jacksonville roofs face a triple threat: blistering UV rays, torrential rains, and wind-driven salt that eats away at shingles. The black streaks you see aren’t just dirt—they’re Gloeocapsa magma algae colonies that shorten roof life. Our low-pressure chemical treatment kills these organisms without blasting away protective granules.
For historic homes in St. Augustine with clay tiles, we use even gentler methods to preserve the patina while removing lichen. Post-cleaning, we apply zinc sulfate strips along ridges to inhibit regrowth—a crucial step in tree-heavy areas like San Marco where shade accelerates organic growth. Unlike many companies, we never use chlorine bleach that can harm surrounding landscaping or corrode metal flashing.
For historic homes in St. Augustine with clay tiles, we use even gentler methods to preserve the patina while removing lichen. Post-cleaning, we apply zinc sulfate strips along ridges to inhibit regrowth—a crucial step in tree-heavy areas like San Marco where shade accelerates organic growth. Unlike many companies, we never use chlorine bleach that can harm surrounding landscaping or corrode metal flashing.
Our Process
- 01 Step 1: Inspect for loose shingles or compromised seals
- 02 Step 2: Apply EPA-registered algaecide via low-pressure sprayer
- 03 Step 3: Allow proper dwell time for biofilms to break down
- 04 Step 4: Rinse with rain-like water volume to avoid granule loss
Benefits
- Prevents premature shingle degradation by removing moisture-trapping organisms
- Reduces cooling costs by eliminating heat-absorbing black streaks
- Maintains historic district compliance for tile roofs
- Includes gutter flushing to prevent post-cleaning clogs
Frequently Asked Questions
Is roof cleaning necessary if I don’t see streaks?
Yes—microbial growth often starts on north-facing slopes or under tree cover before becoming visible. Early treatment prevents costly decking repairs.