How To Clean Roof Algae
in Naples FL
A complete Naples guide to removing roof algae — what causes the black streaks, why soft washing kills it at the root, how to keep it from coming back, and what it costs. Single-story roofs start at $299.
📞 Call for a Free Quote — 239-544-1165Single-Story
Safe Pressure
Results
Quote
The dark black streaks running down most Naples roofs are roof algae — specifically Gloeocapsa magma, a cyanobacteria that thrives in Florida’s hot, humid Gulf Coast climate. It is the single most common roof problem in Naples.
This organism feeds on the limestone filler in asphalt shingles and the calcium carbonate in tile roofing. It spreads steadily across the roof surface, and the dark streaking you see from the street is the visible colony. Left untreated, it covers more of the roof every season.
Roof algae is not just cosmetic. It traps moisture against the roofing material, accelerates deterioration, and shortens the lifespan of the roof. Florida insurers also look at roof condition when a policy is written or renewed, often through an inspection that photographs the roof.
The only correct way to remove roof algae is the soft wash method — a low-pressure application of a biodegradable biocide solution that kills the algae at the cellular root. Pressure washing only removes the surface stain and leaves the organism alive to regrow within weeks.
Pressure washing blasts the visible algae stain away but leaves the root structure alive inside the pores of the roofing material — the algae regrows within weeks. Only a soft wash biocide kills it at the root, and results can last 24 to 36 months.
1. Protect the landscaping. All plants, shrubs, and grass around the home are thoroughly wetted before any solution is applied, and rinsed again afterward. Pool equipment and AC units are protected as well.
2. Apply the biocide solution. A biodegradable soft wash solution is applied to the full roof at low pressure from the eave line, with trained foot placement to protect the tile. The solution makes contact with the algae across the entire surface.
3. Let it dwell. The solution sits on the roof and penetrates into the pores of the tile or shingle, killing the algae organism at the cellular root. This dwell time is what separates a lasting result from a quick surface bleach.
4. Low-pressure rinse. The roof is rinsed at low pressure, carrying away the dead algae and solution residue. The black streaks are gone — and because the root is dead, they stay gone far longer.
This is a job for a professional. It involves working at height, handling biocide chemistry safely, and treating the full roof without damaging it — which requires professional soft wash equipment.
Use Soft Wash, Not Pressure
The single biggest factor in regrowth speed is whether the algae was killed at the root or just blasted off the surface. After a proper soft wash, results can last 24 to 36 months; pressure washing regrows in weeks.
Trim Back Overhanging Trees
Algae thrives in shade and trapped moisture. Trimming branches that shade the roof lets it dry faster after rain and slows algae regrowth significantly.
Keep Gutters Clear
Clogged, overflowing gutters keep the roof edge constantly damp — ideal conditions for algae. Clean gutters help the roof shed water and dry properly.
Plan the Next Clean
Results can last 24 to 36 months. In Naples’ climate, even a properly soft-washed roof will eventually see algae return. A regular cleaning schedule keeps it from ever becoming established again.
Algae removal is priced from a free online quote. The roof’s size, pitch and material, and how far the colony has spread, set the figure, and we do not quote blind over the phone. Naples starting points:
We are consistently 15–30% less than the competition. No franchise fees, no corporate overhead. Call us after getting other quotes — we will beat them. Call 239-544-1165 for a free online quote.
“I started this company to give Naples homeowners a professional option that doesn’t cost a fortune. We do the same quality work as anyone in this market — for less. That’s my promise.” — Blane Perun
15–30% Less Than Competition
No franchise fees, no corporate overhead. Blane runs every job personally.
Florida Licensed Contractor
Fully licensed and insured. COI available on request.
Pre-Approved Access
Pre-registered with most major Naples gated communities. Gate coordination handled directly.
We remove roof algae in Naples FL and throughout Southwest Florida:
Before any treatment, it helps to be sure what is on the roof. The Asphalt Roofing Manufacturers Association (ARMA) says Gloeocapsa magma is probably the most prevalent of several algae species behind roof discoloration, that all of them travel through the air and collect on roofs, and that the natural pigments they produce can turn white or light-colored roofs gradually dark brown or black. It describes the problem as most widespread in the Gulf States and along the Northwest and Eastern Seaboards, especially where conditions are warm and humid, which is a fair description of a Naples summer.
ARMA also draws a useful line: algae streaks should not be confused with moss or tree droppings, which typically cause only localized discoloration. Broad dark bands running down a slope point to algae. A single dark patch under an overhanging branch, or green tufts on the shaded side of a ridge, may be something else, and for moss ARMA advises checking with the shingle manufacturer.
ARMA’s cleaning guidance for asphalt shingles is short and strict. It says discoloration may be lightened with a solution of household bleach and water, left on for at least 15 minutes but no more than 20 minutes, then rinsed by gently spraying the surface with water. It warns against scrubbing, because the friction can loosen and remove granules, and it says plainly not to use a power washer or any type of brush or broom, since high-pressure washing is likely to damage asphalt roofing.
The same page asks for eye protection and rubber gloves when handling bleach, recommends working from a ladder or walkboards where possible to avoid direct contact with the roof, and notes that the cleaning process can make the roof slippery. ARMA encourages homeowners to use professionals and adds that the effect is only temporary and the discoloration may recur, which is why the follow-up habits below matter as much as the cleaning itself.
On a concrete tile roof, the guidance comes from the tile makers. Eagle Roofing Products, a concrete tile manufacturer, says chemicals should be used sparingly to avoid damage and that the most diluted solution compatible with concrete should be used, because certain products on the market can change the pH of the tile and disfigure its appearance. Where specialists use pressure, Eagle says it should not exceed 1,200 psi, and it recommends only water on the crown of the home.
Eagle also asks that anyone cleaning or working on the roof use a fall restraint apparatus, and it suggests hiring a licensed, bonded and insured roofing contractor who inspects the roof first and handles any needed repairs. Our low-pressure soft wash sits well under Eagle’s pressure ceiling, and the product choice for a tile roof is made with its warning about tile appearance in mind.
Cleaning resets the roof; it does not change the climate it sits in. ARMA notes that several types of algae-resistant roofing shingles have been developed and are commercially available. If a shingle roof is nearing the end of its life anyway, asking your roofer about algae-resistant products is a sensible way to lengthen the time between cleanings on the next roof.
For the roof you have now, plan around this: after a proper soft wash, results can last 24 to 36 months, and a roof kept free of overhanging limbs and overflowing gutters gives the algae fewer places to restart. Note the date of each cleaning on your home records so you can see how your own roof behaves over time.
Black streaks GONE in 1 visit — and they stay gone for 2-3 years.
Soft wash chemistry kills Gloeocapsa Magma at the root, not just on the surface. No high pressure, no tile damage, no voided warranty.
Get Your Free Quote
Tell me what needs cleaning and where — I'll send a firm, no-obligation price by text or email, usually the same day.
Get My Quote →Lock in the best day for your schedule
Reserve the best time and date for your schedule and I'll follow up with your numbers. No payment to hold a spot and no obligation to keep the booking — reserve now, decide once you have the price.
About the Author
Owner Blane Perun started this company with a simple premise: Naples homeowners deserve a professional exterior cleaning option that doesn’t come with the inflated pricing of franchise operations and large corporate companies.
