Pressure washing single ply roofs, such as TPO, EPDM, and PVC, is a common maintenance practice but it comes with certain considerations and warnings. Here’s what you need to know:
Pros of Pressure Washing Roofs
- Effective Cleaning: Pressure washing can effectively remove dirt, debris, mold, algae, and other contaminants that regular cleaning methods may not fully address.
- Improved Appearance: A clean roof enhances the overall appearance of the building, making it look well-maintained and professional.
- Preventative Maintenance: Removing debris and buildup can prevent potential damage and prolong the roof’s lifespan.
Cons and Risks of Pressure Washing Single-Ply Roofs
- Potential Damage: High-pressure water can damage the roof membrane, especially if the pressure is too high or if the nozzle is held too close to the surface. This can lead to punctures, tears, or seam separation.
- Water Infiltration: Improper pressure washing techniques can force water into seams, flashings, and other vulnerable areas, leading to water infiltration and potential damage to the underlying structure.
- Manufacturer’s Warranty: Some roofing material manufacturers may void warranties if pressure washing causes damage. Always check the warranty terms before proceeding.
Recommendations for Safe Pressure Washing of Single Ply Roofs
- Low Pressure: Use a low-pressure setting to minimize the risk of damage. It’s generally recommended to use pressures no higher than 1,500 psi.
- Soft Wash Technique: Consider using a soft wash method, which combines low pressure with specialized cleaning solutions designed for roofing materials. This approach is gentler and less likely to cause damage.
- Professional Service: Hire a professional roofing contractor experienced in cleaning single ply roofs. They will have the knowledge and equipment to perform the job safely and effectively.
- Proper Distance: Maintain an appropriate distance between the nozzle and the roof surface to avoid direct, high-pressure contact.
- Angle of Spray: Use a wide-angle spray pattern and direct the water flow down the slope of the roof to prevent water from being driven under the membrane or into seams.
- Regular Maintenance: Incorporate regular, gentle cleaning into your maintenance routine to reduce the need for more aggressive cleaning methods.
Alternatives to Pressure Washing Flat Roofs
- Manual Cleaning: Use soft-bristled brushes or brooms to manually remove debris and buildup.
- Chemical Cleaners: Apply chemical cleaners specifically designed for TPO, EPDM, or PVC roofs. These cleaners can effectively break down and remove contaminants without the need for high-pressure washing.
While pressure washing can be an effective way to clean single ply roofs, it must be done with caution to avoid damaging the membrane. Using low pressure, soft wash techniques, and professional services can help maintain the roof’s integrity while keeping it clean. Always consult with your roofing manufacturer and a Colorado commercial roofing contractor to determine the best cleaning method for your specific roof type.
For expert advice and professional roof maintenance in the Denver area, Fort Collins, and Colorado Springs, contact HRS Restoration Services. Our team specializes in safe and effective cleaning methods for TPO, EPDM, and PVC roofing systems, ensuring your roof remains in optimal condition.