San Diego's Tile Roof Cleaning Experts

Yes. In today’s insurance market, carriers like Liberty Mutual (formerly Safeco) and others are aggressively using drone and satellite technology to inspect California properties. I have seen these aerial photos firsthand. They are high resolution enough for insurers to algorithmically flag moss, mildew, algae, lichen, or even minor debris as a “hazard”.

Yes. In California, any home improvement or maintenance project including a roof cleaning that exceeds a total cost of $1,000 (labor and materials combined) legally requires a California contractor’s license issued by the Contractors State License Board (CSLB).

While recent 2025 legislation (AB 2622) raised the “handyman exemption” from $500 to $1,000, it only applies if the person works alone. If a company sends a crew of two or more people, they must be licensed regardless of the price. At Washed Out Pressure Washing, we carry CA contractor license #1093590, are bonded and insured, ensuring your property is protected and the work is performed according to California’s strict environmental and safety standards.

For 2026, the average cost for roof cleaning in San Diego typically ranged from $0.55 to $1.20 per square foot. Factors like the type of roof tiles, the homes architecture, ladder or lift access, roof pitch, the amount of organic growth (moss/algae/mildew), and the total square footage of the roof affect the final quote. We provide instant, transparent estimates through our online quote tool.

While our technicians are highly trained in ’tile-walking’ techniques and we use low-pressure along with soft washing to minimize movement, we have a No-Cost Damage Guarantee. If we crack or break a roof tile during the cleaning process, we will repair or replace it at no cost to the homeowner. We keep common San Diego tile profiles on hand and are experienced in proper tile replacement to ensure your roof’s integrity and water-shedding capabilities remain fully intact.

Our cleaning process is customized based on your specific roof material. For true clay Spanish tiles, we use a specialized ‘soft wash’ method which uses a soap that halts organic growth and then we rinse the organic material from the surface of tiles without the need for high pressure. For concrete or cement tiles (the most common in San Diego County), we utilize a hot water and light pressure technique to restore the surface. Sort of like washing your dishes with hot water instead of cold. The surface becomes cleaner easier, without using as much pressure. Regardless of the method, our treatments typically last 5 to 8 years before organic growth reappears, unless the home is under heavy shade or located directly on the beach where salt and moisture are more prevalent.

On average, a professional roof cleaning in San Diego will keep a roof clean for 5 to 8 years. Homes in shaded areas or those very close to the coast (where salt and moisture are higher) may require more frequent maintenance to prevent moss regrowth.

The primary difference is Thermal Power vs. Mechanical Force. Standard pressure washing relies on high pressure (often 3,000+ PSI) to physically “blast” dirt off a surface, which can be abrasive and damaging to roof tiles. In contrast, our High Heat “Steam Cleaning” uses water heated to approximately 150°F – 180°F and low pressure to remove the organic material from the roof tiles. The heat acts as a natural sanitizer that melts away grime and organic root systems (like moss and lichen) on a microscopic level without the need for high pressure. This makes it the safest and most effective choice for delicate cement or concrete tiles common in San Diego.

No, when performed by trained professionals using the correct methods. It is important to understand that your roof tiles are designed to shed water and protect the underlying waterproof substrate (underlayment) from UV rays, wind, and debris. Leaks are typically caused by compromised underlayment, not the cleaning itself. We use low-pressure steam or soft washing specifically to avoid the risk of “water intrusion” which is a common issue when using high pressure where water can be forced upward under the tiles. By removing heavy build ups of moss, algae, mildew, and debris we prevent “water dams” that can trap moisture and cause the substrate to rot or leak prematurely.

At Washed Out Pressure Washing, we strictly adhere to San Diego’s “Think Blue” stormwater regulations and Municipal Code §43.0304, which prohibits wash water from entering the storm drain system. We utilize a “Control, Contain, and Capture” system: first, we block nearby storm drains with containment berms; second, we use professional-grade vacuum recovery systems to collect the wash water at the source. Once captured, the water is filtered and, in most cases, we utilize the excess wash water to irrigate the property’s landscaping. The organic material coming from the roof is basically made of compost so the plants will love it.

Absolutely. Installing solar panels over a dirty roof traps moisture and algae underneath, which can lead to rot and make future cleaning nearly impossible. We recommend cleaning your roof prior to installing solar racks to ensure that your roof outlasts your solar investment.

For a standard residential home in San Diego County, a professional roof cleaning typically takes between 3 to 4 hours. Because we utilize commercial grade equipment and highly trained technicians, we can achieve a deeper clean in a fraction of the time it takes for DIY or “handyman” setups. While the total time can vary based on the roofing material and the level of organic growth, it is extremely rare for our projects to exceed a single day. This ensures minimal disruption to your schedule while providing a 5 – 8 year clean in just one day.

The difference primarily comes down to instant results vs. long term remediation.

• Soft Wash Roof Cleaning: This is a comprehensive service where we apply our cleaning solutions and then perform a low pressure rinse to physically remove the dead algae, moss, and debris that same day. You get instant curb appeal and a clean roof before we leave the driveway.
• Soft Wash Roof Treatment: This is often referred to as a “spray and leave” or biocide / algaecide application. That involves applying the same professional-grade solution to kill the organic growth at the root, but it does not get rinsed. Instead, you allow the wind and rain to naturally wash away the dead matter over several months.

At Washed Out Pressure Washing, we typically perform a soft wash cleaning for our San Diego clients to ensure immediate results and compliance with insurance or HOA mandates.

No, Here at Washed Out Pressure Washing we follow a “Plant First” protocol. While the biodegradable soaps used in soft washing are designed to kill organic growth like algae, mildew, and moss, we take three specific steps to protect your San Diego landscaping:

1. Saturation & Shielding: Before and during the process, we heavily pre-wet all surrounding plants and grass with fresh water. This ensures the root systems are ‘full’ and cannot absorb the cleaning solution.
2. Chemical Neutralization: We apply professional grade plant surfactants and neutralizers to the foliage after the cleaning is complete. This renders all cleaning agents inert and safe.
3. Beneficial Irrigation: Our reclamation process involves capturing the wash water and—once safely diluted and neutralized—utilizing it to irrigate your lawn. This prevents runoff from entering storm drains while safely returning filtered water to the soil.

By having a dedicated ground technician whose sole job is to monitor and rinse your greenery, we ensure your roof gets clean while your garden remains lush and healthy.

Absolutely. In California, roof cleaning is classified as high risk work. If a technician is injured on your property and the company does not carry Workers’ Compensation insurance, the financial liability can fall directly on the homeowner.

Many “budget” companies or solo handymen carry only General Liability insurance, which protects your house but does not cover their workers. At Washed Out Pressure Washing, we carry full Workers’ Comp for every team member. This ensures that in the unlikely event of a slip or fall, our employees are fully covered by us, and your personal assets and homeowners’ insurance remain completely protected. We are happy to provide a Certificate of Insurance (COI) prior to starting any project.

If you received a “Notice of Conditions Surcharge at Renewal” from the California FAIR Plan, it means their aerial or drone inspections flagged moss growth on 10% or more of your roof surface. This notice often comes with a double penalty: an immediate premium surcharge and the removal of your “Dwelling Replacement Cost” coverage leaving you underinsured in the event of a total loss.

To reverse this surcharge and reinstate your full replacement coverage, the FAIR Plan requires proof that the moss has been professionally removed. At Washed Out Pressure Washing, we specialize in insurance mandated remediation’s. We provide a Low Pressure Steam Clean Soft Wash that safely kills 100% of the moss at the root (protecting your tiles) and provide the Professional Certificate of Completion along with high resolution “Before and After” photos you need to submit to your broker to satisfy the FAIR Plan’s requirements and lower your premium back to standard rates.