PORTLAND, OR
Roof Cleaning Portland OR
Oregon’s Rain Creates Moss. We Remove It.
Portland’s legendary rainfall and overcast skies make moss growth nearly universal on area roofs. Left untreated, moss destroys shingles and causes structural damage. We eliminate it completely with professional soft wash.
Get a Free Portland Roof Estimate →Same-day response · Licensed & insured · 5-star rated
Portland Roofs and Moss: The Pacific Northwest Problem
Portland receives over 36 inches of rain annually across 144+ rainy days — and more importantly, the city averages only 144 sunny days per year. That means your roof goes months at a time without significant UV exposure, which is the primary natural moss killer. The result: Portland roofs develop moss faster and more severely than almost any other major US city outside of Seattle.
In Portland neighborhoods like Lake Oswego, Beaverton, Gresham, and Hillsboro, moss-covered roofs are practically universal within 3–5 years of installation. Many Portland homeowners assume this is just “how it is.” It’s not — it’s preventable with annual soft wash treatment.
Moss physically lifts shingles at the tabs and edges, allowing water under the shingle surface. In Portland’s rainy climate, this water sits against the roof deck for days or weeks at a time. This is how moss causes structural damage — not just cosmetic staining — and it progresses quietly until you have rot, leaks, and a repair bill in the thousands.
Our Portland Roof Cleaning Process
1. Assessment
We photograph the full roof, assess moss coverage and severity, check for lifted shingles, and document any pre-existing damage. You know exactly what we found before we start.
2. Plant Protection
Pre-wet all landscaping. Portland homeowners take their gardens seriously — we take protecting them seriously too. Our solution is biodegradable and safe when applied correctly.
3. Soft Wash Treatment
Low-pressure application of professional moss-killing solution. Penetrates the colony and kills at the cellular level. ARMA-endorsed process that won’t void your shingle warranty.
4. Zinc Treatment
Zinc solution applied after cleaning creates a moss-inhibiting barrier. In Portland’s climate, zinc treatment is essential — it extends clean results from 12 months to 18–24 months.
Portland Roof Cleaning Pricing
| Home Size | Roof Area | Price |
|---|---|---|
| Up to 1,600 sqft | ~1,000–1,300 sqft | $549 |
| 1,600–2,200 sqft | ~1,300–1,800 sqft | $649 |
| 2,200–3,000 sqft | ~1,800–2,400 sqft | $749 |
| 3,000+ sqft | 2,400+ sqft | Custom quote |
All Portland pricing includes zinc treatment. Bundle with gutter cleaning and save $50.
Portland Roof Cleaning FAQs
How long will my Portland roof stay clean after treatment?
With zinc treatment included in our service, most Portland roofs stay clean for 18–24 months. Without zinc, moss returns in 12 months or less in Portland’s climate.
Dead moss doesn’t wash off immediately — is that normal?
Yes. After soft wash treatment, dead moss may remain on the roof for 2–6 weeks before Portland’s rain washes it away. The moss is biologically dead immediately after treatment — it just takes rainfall to physically remove the remains. This is normal and expected.
Are you licensed to work in Oregon?
Yes. We carry $1M+ general liability insurance and are fully licensed to operate in Oregon. We’ll provide our certificate of insurance before we start.
Book Your Portland Roof Cleaning
Free estimate · Same-day response · Zinc treatment included
Get My Free Estimate Call (916) 699-7401