Nowhere grows roof moss like the Pacific Northwest. If you’re in Portland, Beaverton, Gresham or anywhere in the metro, here’s what’s happening up there — and how to fix it for good.
Why moss loves Portland roofs
Moss needs moisture and shade, and our long, damp winters deliver both. North-facing slopes and roofs under tree canopy stay wet for months, letting moss and black algae take hold and spread.
Why it’s a real problem
- Moss holds water against shingles, accelerating wear
- It lifts and separates shingles, inviting leaks
- Black streaks (Gloeocapsa algae) stain and spread
- Clogged, mossy gutters cause overflow and rot
How to stop moss from coming back
Start with a professional soft wash to remove existing growth at the root. Then keep it from returning: trim back overhanging branches to let sunlight in, keep gutters clear so water drains, and consider a periodic moss-prevention treatment. Many of our roof jobs include a no-regrowth treatment that keeps roofs clean far longer.
DIY vs. hiring a pro
Climbing a wet, mossy roof is dangerous, and pressure washing it causes damage. A licensed, insured soft-wash crew clears it safely and protects your roof. If you’d rather not risk it, request a free quote — 30% off your first wash right now.
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