Roof Cleaning Jacksonville, FL

By Jax Pressure Washing · Updated October 2026

If you look up at roofs across Jacksonville, you will notice the same thing on house after house: dark black streaks running down the shingles. Those streaks are a living organism called Gloeocapsa magma, a type of blue-green algae that feeds on the limestone filler in asphalt shingles. Jacksonville's heat and humidity make it spread fast, and once it starts on one roof, the spores travel to neighboring homes on the wind.

Here is what most homeowners do not know: asphalt shingle manufacturers recommend soft washing only - never high-pressure water on a shingle roof. Pressure washing strips the protective granules off shingles, and those granules are what shield your roof from UV damage. Jax Pressure Washing cleans roofs with a soft-wash treatment that kills the algae at the root and rinses gently, which is the method your shingle manufacturer actually stands behind.

A clean roof does more than improve how your home looks from the street. Algae holds moisture against your shingles and shortens their life, and dirty roofs are one of the most common reasons Jacksonville HOAs send violation letters. Regular soft-wash cleaning is a fraction of the cost of a premature roof replacement. Call (904) 555-0134 for free quotes.

Roof Cleaning

Those Black Streaks Are Alive - and Spreading

Gloeocapsa magma is not dirt and it is not a stain you can ignore. It is a colony of algae that anchors itself to your shingles and feeds on the limestone in them. It starts as a few dark spots, usually on the north-facing slope where moisture lingers longest, and spreads into the long vertical streaks you see all over Jacksonville.

The algae does two kinds of damage. First, it is ugly - black streaks make even a newer roof look old and neglected, which drags down curb appeal and can draw an HOA letter in communities like Ponte Vedra, Nocatee, and Fleming Island that enforce roof appearance standards. Second, the algae mat holds moisture against the shingle surface, and that constant dampness accelerates granule loss and aging. A roof covered in algae is aging faster than a clean one, plain and simple.

Roof Cleaning

Why We Never Pressure Wash Asphalt Shingles

This is the most important thing on this page: high-pressure water damages asphalt shingle roofs. The pressure strips granules off the shingle surface, and those granules are the roof's armor against Florida's intense UV. Lose the granules and the shingle deteriorates years faster - and because the damage is obvious, it can also give a manufacturer reason to question a warranty claim down the road.

How soft washing works instead

• We apply a treatment solution that kills Gloeocapsa magma, moss, and lichen at the root
• Everything is applied and rinsed at low pressure - no blasting, no granule loss
• The solution continues working after we leave; full results develop over the following days
• Gutters and landscaping are protected and rinsed during the process

Soft washing is slower than pressure washing, and that is the point. Your roof is the most expensive surface on your home - it deserves the method that cleans it without wearing it out.

Jacksonville, FL

Tile and Metal Roofs in Jacksonville

Asphalt shingles are the most common roof in Jacksonville, but plenty of homes have clay or concrete tile - especially in Mediterranean-style neighborhoods - and metal roofs are growing in popularity along the coast. The good news is that the same soft-wash approach works for all of them, with adjustments.

Tile roofs collect the same black algae plus lichen that anchors into the tile's texture. We clean tile roofs at low pressure because high pressure can crack tiles and blast out the underlayment protection, and cracked tiles are an expensive fix. Metal roofs get algae film and oxidation staining rather than granule-eating growth, and they clean up well with a soft wash that restores the finish without scratching the coating.

Roof Cleaning

What Our Roof Cleaning Includes

Every roof cleaning starts with an assessment - we look at the roof type, the extent of the growth, and any fragile areas like skylights or vents before we set up. Then we get to work.

• Soft-wash treatment across all roof surfaces, including ridges and valleys where growth hides
• Gentle rinse that carries away dead algae without disturbing granules or tile
• Gutters cleared of the runoff debris from the cleaning (not a full gutter cleaning - see our gutter service for that)
• Landscaping pre-wet and rinsed, same as with our house washing
• A final walk-around to confirm even coverage and no missed streaks

You do not need to be home. We need access to an outdoor spigot and a clear path around the house, and we handle the rest.

Pricing

Cleaning vs. Replacing: The Honest Math

A full roof replacement is one of the most expensive projects a homeowner ever pays for. Roof cleaning costs a small fraction of that, and on a roof that is structurally sound, it buys real time. Algae-covered shingles that look twenty years old often clean up to look nearly new - and more importantly, removing the growth stops the moisture damage that was shortening the roof's life.

We will be straight with you, though: cleaning cannot fix a failing roof. If shingles are curling, losing granules in handfuls, or leaking, no wash will save them, and we will tell you that rather than take your money for a cleaning that will not help. But if your roof is simply dirty - which is the case for most of the streaked roofs we see in Jacksonville - soft washing is the smart move long before replacement ever enters the picture.

💲 Wondering what this costs? See typical Jacksonville prices for this service — then get your exact quote free.

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