What Are Those Black Streaks on My Roof?
If you've noticed dark, vertical streaks running down your roof, you're not alone. Nearly every asphalt shingle roof in Florida develops this problem—and it's not dirt, pollution, or aging shingles.
Those black streaks are Gloeocapsa magma, a type of algae that feeds on the limestone filler used in modern asphalt shingles. This algae thrives in Florida's humid climate, spreading quickly across your roof and creating ugly dark stains that make your home look old and neglected.
Why it matters: Beyond appearance, algae growth can shorten your roof's lifespan by trapping heat and moisture, accelerating granule loss and deterioration. Left untreated, algae-covered shingles absorb more heat, driving up cooling costs and potentially voiding warranty coverage from some manufacturers.
Professional roof cleaning removes algae, kills the spores, and restores your roof's original appearance—without the risk of damage from high-pressure washing.
Our Soft Wash Roof Cleaning Process
At Amerivet Pressure Washing, we use a soft wash system specifically designed for roof cleaning. High-pressure washing can lift shingles, strip protective granules, and force water under roofing materials—leading to leaks and costly damage. Our low-pressure approach is recommended by roofing manufacturers and delivers superior, longer-lasting results.
How Soft Washing Works:
- Inspection: We inspect your roof for any pre-existing damage, weak areas, or vulnerable flashing.
- Soft Wash Application: We apply a biodegradable cleaning solution at low pressure (similar to a garden hose) that kills algae, moss, and lichen at the root.
- Dwell Time: The solution sits for 15-20 minutes, penetrating organic growth and breaking it down.
- Gentle Rinse: We rinse with low-pressure water, washing away dead algae and leaving your roof clean.
- Prevention Treatment: Our cleaning solution continues working for weeks after application, preventing regrowth.
The result? A clean roof that stays cleaner longer—often 2-3 times longer than pressure washing alone—with zero risk of shingle damage.
Benefits of Professional Roof Cleaning
🏡 Restore Curb Appeal
A clean roof dramatically improves your home's appearance and makes it look years newer.
🛡️ Extend Roof Lifespan
Removing algae prevents heat buildup and granule loss, helping your shingles last longer.
đź’° Increase Home Value
A stained roof hurts resale value. Cleaning can add thousands to your home's worth.
❄️ Lower Cooling Costs
Algae-covered roofs absorb more heat. A clean roof reflects sunlight and reduces energy bills.
âś… Protect Your Warranty
Some shingle warranties require regular cleaning. Neglect can void coverage.
🌿 Prevent Moss & Lichen
Soft washing kills growth at the root, preventing moss and lichen from taking hold.
What Types of Roofs Can You Clean?
Our soft wash roof cleaning is safe and effective for all common roofing materials in Tampa Bay:
- Asphalt Shingles – the most common roof type in Florida, and the most prone to algae staining
- Architectural Shingles – safely cleaned without damaging dimensional texture
- Concrete Tile – removes algae, moss, and lichen from tiles and grout lines
- Clay Tile – gentle cleaning that won't crack or damage delicate tiles
- Metal Roofs – cleans oxidation, rust stains, and organic growth
- Flat/Low-Slope Roofs – removes ponding water stains and biological growth
We do not recommend roof cleaning for wood shake or severely damaged roofs. If your roof is nearing the end of its lifespan, we'll let you know upfront and recommend replacement instead.
How Often Should You Clean Your Roof in Florida?
Most Tampa Bay roofs need cleaning every 2 to 3 years. However, cleaning frequency depends on several factors:
- Shade and Trees: Roofs with heavy tree coverage see faster algae growth and may need cleaning every 18-24 months.
- Roof Color: Light-colored shingles show staining more quickly than dark shingles.
- Roof Direction: North-facing slopes stay shaded and damp, encouraging faster algae growth.
- Neighborhood Trends: Algae spreads from roof to roof via airborne spores. If neighbors have stained roofs, yours is at higher risk.
- HOA Requirements: Some homeowners associations mandate regular roof cleaning.
Regular cleaning prevents heavy buildup, keeps your roof looking great, and protects your investment year-round.
Roof Cleaning vs. Roof Replacement
Many homeowners assume a stained roof needs replacement. In most cases, professional cleaning can restore your roof for a fraction of the cost of replacement.
Average costs:
- Professional roof cleaning: $300 - $600
- Roof replacement: $8,000 - $25,000+
If your shingles are still structurally sound—no missing granules, cracked shingles, or widespread damage—cleaning is the smart, cost-effective choice. We'll inspect your roof during the quote and give you an honest assessment of whether cleaning makes sense or if replacement is the better option.
Service Areas
We provide professional roof cleaning throughout Tampa Bay, including:
Frequently Asked Questions
How much does roof cleaning cost in Tampa Bay?
Most residential roofs cost $300 to $600 depending on size, pitch, and level of staining. Single-story homes typically start around $300. Two-story homes and complex rooflines cost more. We provide free quotes with no obligation.
Will roof cleaning damage my shingles?
No. Our soft wash process uses low pressure specifically designed to clean shingles safely. High-pressure washing (which we never use on roofs) can lift shingles, strip granules, and cause leaks. Soft washing is manufacturer-recommended and 100% safe.
How long does roof cleaning take?
Most residential roofs take 2 to 4 hours from start to finish. Larger homes or heavily stained roofs may take longer.
Do I need to be home during roof cleaning?
Not necessarily. As long as we can access your property and outdoor water faucets, we can complete the work while you're away. We'll notify you when we arrive and when we're finished.
Can you remove moss from my roof?
Yes. Our soft wash treatment kills moss, lichen, and algae at the root. Heavy moss buildup may require manual removal before cleaning to prevent damage, which we can handle as part of the service.
What's the black stuff on my roof?
Those black streaks are Gloeocapsa magma, a type of algae that feeds on the limestone in asphalt shingles. It's common in Florida and can be safely removed with professional soft washing.
How long will my roof stay clean?
With soft washing, your roof typically stays clean for 2 to 3 years. Our cleaning solution continues working for weeks after application, killing any remaining spores and delaying regrowth.
Is roof cleaning safe for my landscaping?
Yes. We pre-rinse all plants and landscaping, use biodegradable cleaning solutions, and take steps to protect vegetation during runoff. Our process is safe when performed by trained professionals.
Why Choose Amerivet for Roof Cleaning?
- Veteran-Owned & Operated – Precision, integrity, and professionalism in every job.
- Licensed & Insured – Full liability coverage for your peace of mind.
- Soft Wash Specialists – We use the safest, most effective methods for roof cleaning.
- No High-Pressure Damage – We never use high pressure on roofs—only manufacturer-recommended soft washing.
- Local Tampa Bay Experts – We understand Florida roofs and what it takes to keep them clean.
- Free Honest Quotes – We'll tell you if cleaning makes sense or if replacement is the better option.
- Satisfaction Guaranteed – We're not done until you're 100% happy.
Ready to Restore Your Roof?
Get your free quote today. Most roofs can be scheduled within 3-5 business days.
Serving Ruskin, Riverview, Brandon, Tampa, and all of Tampa Bay