Why High-Pressure Washing Destroys Asphalt Shingles (And Why Soft Washing Is Required)
- High pressure strips protective asphalt granules and can shorten your roof's life.
- We follow the Asphalt Roofing Manufacturers Association (ARMA) roof-cleaning guidelines and use an ARMA-guideline tested solution.
- We brush moss off by hand, then apply a soft wash moss treatment. The remaining moss dries out and washes off with rain within 2–3 months.
- Two Brothers Roof Clean Ltd. includes a 2-Year No-Moss Warranty on every full roof cleaning.
The Hidden Danger of Pressure Washing Your Roof
When homeowners in Surrey, Langley, or White Rock see green moss cushions spreading across their rooflines, the first instinct is often to blast it off with a heavy-duty pressure washer. However, high-pressure power washing acts like a sandblaster on asphalt shingles.
- Stripping Mineral Granules: Asphalt shingles are coated in fine ceramic granules designed to shield the fiberglass backing from sun UV rays and rainwater. High pressure strips these granules away, turning a 25-year roof into a 10-year roof overnight.
- Voiding Manufacturer Warranties: Major roofing manufacturers explicitly state that high-pressure washing voids shingle warranties.
- Driving Water Under Shingle Flaps: High-pressure water shoots upward underneath shingle overlaps, rotting the wooden roof decking and causing interior ceiling leaks.
What Is Soft Washing & How Does It Work?
Soft washing is a low-pressure way to treat roof moss, lichen and black algae without blasting granules off your shingles. Our process: manual brushing and scrubbing first, then a soft wash moss treatment using an ARMA-guideline tested solution (biodegradable, plant- and pet-friendly options available).
- Moss Treatment That Keeps Working: after the soft wash treatment, remaining moss dries out and detaches naturally with rain within 2–3 months.
- Granule Preservation: Zero high pressure touches your roof, ensuring 100% granule retention.
- Long-Lasting Results: every roof cleaning comes with our 2-Year No-Moss Warranty.
How Two Brothers Protects Your Home & Landscaping
Before applying the soft wash treatment, our Surrey crew pre-soaks all surrounding gardens, shrubs, and flower beds with clean water. We re-rinse vegetation during and after the wash. Every full roof cleaning comes with our 2-Year No-Moss Warranty.
Need Roof Moss Removal or Gutter Flushing?
Get a shingle-safe exterior clean backed by our 2-Year No-Moss Warranty.