Roof Moss Removal in the Tri-Cities: Why Pressure Washing Is the Wrong Approach

Save Your Roof from Premature Aging and Costly Leaks

Moss is a common sight on roofs throughout Port Moody and Coquitlam, but how you remove it matters. Many 'pros' reach for a pressure washer, but this is the worst thing you can do for your shingles. We'll explain why low-pressure treatments are the only safe way to handle roof moss.

Handyman Hans Pressure Washing | 27 Jan 2026

Roof Moss Removal in the Tri-Cities: Why Pressure Washing Is the Wrong Approach

The Risks of Pressure Washing Your Roof

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Granule Loss: High pressure strips away the protective granules that protect shingles from UV rays, much like how poor gutter maintenance allows water to back up under tiles.
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Water Injection: It can force water under the shingles and into your attic, causing rot.
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Voided Warranties: Most shingle manufacturers will void your warranty if they find out you pressure washed it.
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Shortened Lifespan: You could be taking 10 years off the life of your roof in just one afternoon.

Our Safe Removal Process

A better way for Tri-Cities roofs:

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Gentle Manual Removal: We carefully brush away large clumps of moss by hand, ensuring your house siding stays clean during the process.
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Chemical Treatment: We apply a specialized solution that kills the moss at the root.
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Pre-Treatment Soak: Our process ensures the solution stays on the roof, not your lawn.
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Long-Term Prevention: Our treatment inhibits new growth for months after the job is done.

Before & After Gallery

See the Difference Professional Pressure Washing Can Make

Nothing builds trust like real results. At Handyman Hans Pressure Washing, we take pride in every job — and it shows. Below, you'll find a selection of our recent projects across Port Moody, Coquitlam, Burnaby, and nearby areas. Use the sliders or image sets to explore the dramatic difference our cleaning makes.