pressure wash asphalt shingle roof

The Effects of Pressure Washing Asphalt Shingle Roofs

Maintaining the integrity and aesthetics of a home is paramount for any homeowner, and one of the most significant aspects of home maintenance is the roof. Asphalt shingle roofs are popular due to their affordability, durability, and versatility, but they can suffer from the build-up of dirt, algae, moss, and other debris. Many homeowners consider pressure washing as a solution to this problem. However, it is crucial to understand the implications of using pressure washing on asphalt shingle roofs and to weigh the pros and cons before proceeding.

Understanding Asphalt Shingles

Asphalt shingles are made from a fiberglass mat saturated with asphalt and coated with mineral granules. They are designed to be weather-resistant and can last anywhere from 15 to 30 years, depending on quality, installation, and maintenance. However, over time, shingles can accumulate dirt, algae, and moss, which not only detracts from their appearance but can also lead to further deterioration. The presence of algae or moss can trap moisture, creating an environment for mold and potentially shortening the life of the roof.

The Allure of Pressure Washing

Pressure washing is often viewed as a quick and efficient way to clean surfaces, including roofs. Homeowners may be tempted to use this method to restore the appearance of their asphalt shingle roofs. However, the high-pressure water stream can have unintended consequences. The pressure used in power washing can easily dislodge the granules on the shingles, which are essential for protecting the roof from UV rays and harsh weather conditions.

Potential Risks of Pressure Washing Asphalt Shingles

1. Granule Loss One of the most significant risks associated with pressure washing asphalt shingles is the loss of granules. These granules are crucial for reflecting sunlight and protecting the underlying materials. Once lost, the shingles become more susceptible to damage from the sun, leading to premature aging and potential leaks.

2. Increased Water Intrusion Pressure washing can drive water under the shingles, creating pathways for moisture to seep into the roof deck. This can lead to water damage and mold growth within the attic, compromising the integrity of the entire roofing system.

3. Warranty Voids Many manufacturers of asphalt shingles specify in their warranty documentation that pressure washing is not an acceptable cleaning method. Using this method could void the warranty, leaving homeowners responsible for any future repairs or replacements.

4. Physical Damage The high-pressure water can be too harsh for some shingles, resulting in cracks, splits, or even tearing. This physical damage could require repair or replacement of affected shingles, leading to further costs.

Alternative Cleaning Methods

Given the risks associated with pressure washing, homeowners should consider alternative methods for cleaning asphalt shingle roofs. Hiring a professional roofing company that specializes in roof cleaning is one effective approach. These professionals often use low-pressure washing techniques or specialized cleaning solutions that can effectively remove dirt, algae, and moss without damaging the shingles.

Another option is to use a mixture of water and mild detergent or a roof cleaning solution that is specifically designed for asphalt shingles. This solution can be applied with a garden sprayer and left to sit for a while before being rinsed off with a gentle spray. This method reduces the risk of granule loss and physical damage.

Conclusion

While pressure washing might seem like an appealing solution for cleaning asphalt shingle roofs, the potential risks often outweigh the benefits. The loss of granules, increased water intrusion, warranty issues, and physical damage are significant concerns that need to be addressed. Homeowners looking to maintain their roofs should consider safer alternatives, such as professional roof cleaning services or gentle cleaning solutions. By taking proper steps to care for an asphalt shingle roof, homeowners can extend its lifespan, maintain its appearance, and, ultimately, protect their investment in their home.