Soft Wash Roof Cleaning: Why It's Better Than Pressure Washing

When you see unsightly black streaks or green moss on your roof, your first instinct might be to blast it away with high pressure. However, using a pressure washer on an asphalt shingle roof is one of the most damaging things you can do. The industry-approved, safe, and effective alternative is soft washing.

What is Soft Washing?

Soft washing is a cleaning method that uses low-pressure water—often no stronger than a garden hose—combined with specialized, biodegradable cleaning solutions. Instead of relying on destructive force, the cleaning agents do the work. They seep into the pores of your shingles to kill algae, moss, and lichen at the root, allowing them to be gently rinsed away.

The Dangers of Pressure Washing Your Roof

Pressure washing an asphalt roof can cause irreversible damage:

• Granule Loss: The high-pressure stream strips away the protective granules on your shingles. These granules are essential for reflecting UV rays and protecting the asphalt underneath from the elements.
• Water Intrusion: The intense pressure can lift shingles and force water underneath them, leading to rot in your roof deck and potential leaks inside your home.
• Voided Warranties: Most roofing manufacturers will void your warranty if the shingles are damaged by pressure washing.
• It Doesn't Kill the Root: Pressure washing only removes the surface layer of growth. It doesn't kill the roots, meaning the algae and moss will grow back much faster.

Benefits of the Soft Wash Method

Soft washing is the only method recommended by the Asphalt Roofing Manufacturers Association (ARMA) for a reason. Here are the benefits:

• 100% Safe for Your Roof: The low-pressure application ensures your shingles and their protective granules remain intact.
• More Effective, Longer-Lasting Clean: By killing the organisms at the root, soft washing keeps your roof looking clean for years, not months.
• Eco-Friendly: The specialized cleaning solutions are biodegradable and will not harm your landscaping, pets, or family.
• Boosts Curb Appeal & Home Value: A clean roof instantly makes your entire property look better maintained and more valuable.