A Guide For How to Clean Roof Shingles

March 4th, 2025
State of roof before and after washing with high pressure. Professional is wearing uniform and using equipment for cleaning.

 

To clean roof shingles, use a mild cleaning solution, a pump sprayer, and a soft bristle brush or a garden hose on the lowest setting. Avoid DIY pressure washing, as it can cause damage and shorten the roof’s lifespan.

 

Regular cleaning prevents algae stains, black streaks, and moisture damage that can weaken shingles over time. It also enhances curb appeal and helps the roof last longer. Using a gentle cleaning method, like soft washing, is the safest way to remove buildup without harming the shingles or surrounding materials.

 

Common Causes of Stains and Algae Growth

 

Over time, roof shingles accumulate dirt, stains, and organic growth that can weaken their structure and impact the appearance of your home. Understanding the causes of black streaks, algae stains, and debris buildup can help you take the right steps to protect your asphalt shingle roof and extend its lifespan.

 

Algae, Moss, and Mildew

 

One of the most common culprits behind black streaks on a shingle roof is black algae, specifically Gloeocapsa magma. These algae spores thrive in humid environments, feeding on the limestone filler in asphalt shingles. Over time, this can cause noticeable algae stains, making the roof look dirty and worn. Moss and mildew also grow in damp conditions, further deteriorating the roof surface.

 

Environmental Factors

 

Several external factors contribute to a dirty asphalt shingle roof. Humidity and shade create the perfect environment for algae growth, while fallen leaves and debris trap moisture, accelerating the problem. Without regular maintenance, these conditions can lead to excessive buildup, making cleaning more difficult.

 

Impact on Your Home

 

Built-up dirt, algae spores, and moisture can weaken the roofing material, leading to potential damage over time. A neglected asphalt roof may develop rot, leaks, or even structural issues. Regular roof cleaning not only prevents these problems but also helps maintain curb appeal and extend the life of the shingle roof.

 

Infographic by Leverage Roofing outlining the steps to clean your roof properly.

Safe and Effective Methods to Clean Roof Shingles

 

Cleaning your shingle roof correctly helps remove black streaks, algae stains, and built-up debris without causing potential damage. Using the right cleaning solution and following proper techniques ensures the best results while protecting your roof surface.

 

Equipment Needed

 

  • Safety harness: Always wear one when working on a shingle roof to prevent falls.
  • Pump sprayer or garden sprayer: Ensures even application of the cleaning solution.
  • Soft bristle brush: Helps remove stains without damaging asphalt shingles.
  • Garden hose: Provides a safe, controlled rinse with clean water.

 

Choosing the Right Cleaning Solution

 

Chemical cleaners:

  • Sodium hypochlorite (commonly found in pool shock) effectively kills algae spores and removes stains.
  • Chlorine bleach is another strong option, but it must be diluted to prevent damage to roofing material.

 

Eco-friendly alternatives:

  • Laundry detergent mixed with water provides a gentler option for mild dirt and stains.
  • Soft washing with a biodegradable roof wash can help remove buildup without using harsh chemicals.

 

Step-by-Step Roof Wash Process

  1. Prepare the cleaning solution in a garden sprayer or pump sprayer.
  2. Apply it evenly across the roof surface, focusing on black streaks and algae stains.
  3. Let the solution sit for several minutes to break down the dirt and organic growth.
  4. Rinse with clean water using a garden hose on the lowest setting to avoid stripping roofing material.
  5. Use a soft bristle brush for stubborn stains, but avoid improper cleaning methods like scrubbing too hard or using excessive pressure washing.

 

By following these steps and using the right roof cleaning methods, you can keep your asphalt shingle roof looking great while preventing long-term potential damage.

 

Infographic by Leverage Roofing outlining 3 ways to keep your roof clean

Preventative Measures to Keep Roof Shingles Clean

 

Preventing stains and damage on your asphalt shingle roof starts with proactive care, like regular maintenance, effective prevention methods like zinc strips, and keeping trees trimmed.

 

Regular Maintenance

 

This is key to preventing algae growth, black streaks, and debris buildup on your asphalt shingle roof. A consistent roof cleaning routine helps remove dirt before it causes potential damage, preserving the integrity of your roofing material. Occasional soft washing prevents the need for frequent deep cleaning while maintaining your roof surface.

 

Trimming Trees and Removing Debris

 

This act also plays a major role in keeping your shingle roof clean. Overhanging branches create shade, which traps moisture and encourages algae stains, moss, and mildew. Trimming trees allows more sunlight to dry the roof surface, reducing moisture retention. Regularly using a leaf blower to clear debris minimizes buildup that could clog gutters or cause potential damage from excess moisture.

 

The Role of Roofing Contractors

 

Hiring a roofing contractor becomes important when stains persist despite preventative measures. If black streaks, algae stains, or deterioration remain after routine maintenance, it may be time to consult a roofing contractor for professional roof cleaning or repairs. Professionals can assess whether your shingle roof needs deeper cleaning, minor repairs, or even a new roof due to prolonged wear. They also ensure safe and effective cleaning techniques, avoiding improper cleaning methods that could damage the roofing material.

 

By implementing these preventative measures, homeowners can protect their asphalt shingle roof, extend its lifespan, and maintain its curb appeal while reducing the need for costly repairs.

 

Workers cleaning roof tiles covered in moss

Trust Leverage Roofing for a Professional Clean

 

Attempting to clean your asphalt shingle roof on your own can lead to more harm than good. Without the right equipment and techniques, homeowners risk potential damage to their roofing material. Improper cleaning methods can strip away protective granules on shingles, weaken the roof surface, and lead to costly repairs. Additionally, working on a shingle roof without proper safety precautions, such as a safety harness, increases the risk of falls and injuries.

 

How Leverage Roofing Ensures Safe & Effective Cleaning

 

At Leverage Roofing, we provide professional roof cleaning services that safely and effectively remove black streaks, algae stains, and debris while preserving the integrity of your shingle roof.

 

  • Our team uses experienced pressure washing techniques that protect asphalt shingles, metal roofs, and tile roofs from potential damage while removing even the most stubborn stains.
  • With expertise in a variety of roofing materials, we customize our roof wash process to ensure optimal results for your home.

 

Proper roof maintenance is essential for protecting your home and extending the life of your roof. If you’re unsure about the right cleaning methods or want to avoid the risks of DIY cleaning, trust Leverage Roofing for expert roof cleaning services.

 

Contact us today to keep your roof surface in top condition and enhance your home’s curb appeal.