Pressure washing asphalt shingle roofs can be a delicate task, and it’s crucial to understand the potential risks and proper techniques to ensure the longevity of your roof. This comprehensive guide will provide you with the necessary information to safely and effectively clean your asphalt shingle roof, from understanding the risks of high-pressure washing to implementing the best practices for a successful cleaning.
Risks of High-Pressure Washing
Granule Loss
Asphalt shingles are coated with small granules that protect the underlying asphalt from UV radiation and weathering. High-pressure water can dislodge these granules, leading to premature wear and reduced roof lifespan. The loss of granules can expose the asphalt, making the shingles more vulnerable to cracking, curling, and other forms of deterioration.
Shingle Damage
The forceful stream of water from a high-pressure washer can cause shingles to lift or become dislodged, leading to leaks and water damage. This can compromise the structural integrity of the roof and create costly repairs.
Warranty Voidance
Many asphalt shingle manufacturers explicitly state that the use of high-pressure washing can void the warranty on their products. If there is evidence of damage caused by pressure washing, the homeowner may be responsible for the full cost of repairs or replacement.
Safe Cleaning Methods
Soft Washing
Soft washing is a low-pressure cleaning method that uses a pressure setting of less than 500 PSI (pounds per square inch) and specialized nozzles to spread the water over a wider area. This approach is gentler on the shingles and can effectively remove dirt, grime, and other contaminants without causing damage.
Chemical Cleaning
Using a proprietary blend of soaps and detergents at low pressure can also be an effective way to clean an asphalt shingle roof without damaging the shingles. These chemical solutions are designed to break down and lift dirt and debris, making it easier to rinse away.
Professional Assistance
For the best results and to ensure the safety of your roof, it is highly recommended to hire a professional roof cleaning service with expertise in asphalt shingle roof maintenance. These professionals have the right equipment, training, and experience to clean your roof effectively and safely.
Precautions and Best Practices
Remove Debris
Before beginning the cleaning process, it’s essential to clear the roof of any loose debris, such as leaves, twigs, or other materials. This will help prevent the debris from being pushed around and potentially causing damage to the shingles during the cleaning.
Inspect for Damage
Carefully inspect the roof for any existing damage, such as cracked, curled, or missing shingles, before starting the cleaning process. This will help you identify areas that require special attention or may be more vulnerable to further damage.
Use the Right Equipment
When soft washing your roof, use a pressure washer with adjustable PSI settings and specialized nozzles designed for low-pressure cleaning. This will ensure that the water is distributed evenly and at a safe pressure to avoid damaging the shingles.
Protect Surroundings
Cover nearby plants, landscaping, and other surfaces with plastic sheets or tarps to protect them from the cleaning solution and any overspray.
Technical Specifications
Pressure Settings
For soft washing an asphalt shingle roof, use a pressure setting of less than 500 PSI. This low-pressure approach will effectively clean the roof without causing damage to the shingles.
Chemical Solutions
When using chemical cleaning methods, a solution of sodium hypochlorite (a disinfectant and sanitizer) mixed with a surfactant can be an effective and safe option. The surfactant helps the solution penetrate and lift dirt and debris more effectively.
Nozzle Selection
Choose nozzles specifically designed for soft washing, as they will spread the water over a wider area, reducing the concentrated force on the shingles.
References
- Power Washing My Roof: Is It a Necessity?
- Can You Pressure Wash a Shingle Roof?
- How to Pressure Wash a Shingle Roof
- Pressure Washing Roofs
- Pressure Washing Asphalt Shingle Roofs
By following the guidelines and best practices outlined in this comprehensive guide, you can safely and effectively clean your asphalt shingle roof, preserving its appearance and extending its lifespan.