What’s the safest way to clean a roof?

​We use a proven soft washing method that’s ideal for homes in the Pacific Northwest. It safely eliminates moss and algae while protecting your roofing materials and extending the life of your roof.

How often should I have my roof cleaned?

​In Portland’s damp climate, we recommend roof cleaning at least once every 1–2 years to prevent moss and algae buildup.

What types of roofs do you clean?

We clean all types of roofs, including asphalt shingles, metal, tile, cedar shake, and flat roofs.

Is your cleaning method safe for older roofs?

Yes. At Rip City Roof Cleaning, we use a soft washing method that is safe for older or more delicate roofs. This technique relies on low-pressure water to gently remove moss, algae, and debris without damaging your shingles. For tougher moss buildup, we may use a wire brush very carefully and only on the ridge caps—never on the main field of shingles—to avoid causing unnecessary wear. We take every precaution to preserve the integrity of your roof while ensuring a thorough clean.

How Effective is the Moss Treatment

After we clean your roof with a wire brush, we apply zinc sulfate to help keep moss from growing back. We sprinkle the powder along the peaks of your roof, and when it rains, the zinc spreads across the surface. This helps stop moss from taking root again and keeps your roof looking clean longer.

How long does moss treatment last?

A professional moss treatment can last 1–3 years, depending on your roof’s exposure to shade, moisture, and surrounding vegetation.

How long does roof cleaning take?

Most residential roof cleaning jobs are completed in one day, depending on the size and condition of the roof.

Do you offer free estimates?

Yes! Rip City Roof Cleaning provides free, no-obligation estimates so you can make an informed decision.

Are you licensed and insured?

Absolutely. We are fully licensed and insured for your peace of mind.