Moss on Your Roof: Why It Grows and How to Remove It Safely
Moss is thicker than the black streaks most roofs get, and it tends to grow on the shadiest, dampest sections.
Moss vs. algae
Black streaks are usually algae, a surface stain. Moss is a raised, green growth that can lift shingle edges and trap water.
Why pressure is a problem
High pressure and scraping strip shingle granules. The Asphalt Roofing Manufacturers Association warns against pressure washing asphalt roofs.
The safer approach
A low-pressure soft wash treatment kills the moss, which then loosens and washes away over time.
What to avoid
- Pressure washing shingles
- Walking on a wet, mossy roof
- Scraping moss off with tools
When to call a professional
Send a photo of the mossy section and we'll quote a soft wash roof treatment. See our roof cleaning service.
What customers say
"First Class Cleaning washed our entire church building roof to ground. The building had built up quite a bit of algae and mildew over the years. It now looks brand new. The guys worked with our preschool and ministry schedule. They got the job done quickly and at a fair price."
Henry H. · Google Review
"I used First Class Pressure Cleaning to seal my aggregate driveway and they did a fantastic job. It was in rough shape as we had never sealed it before. Lots of salt damage as well from trying to de-ice the last winter storm. It looks so much better now. They even came back the next day for touch-ups on some areas where the winter salts had worn through to the concrete. Very happy with this company and the work they’ve done!"
Dan · Google Review
"Amazing service and extremely professional!!! All looks amazing :)"
Jennifer B. · Google Review
96 Google reviews from homeowners and businesses across Middle Tennessee. Read them all on Google.
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Related guides
- What Are the Black Streaks on My Roof?
- How to Clean a Metal Roof
- How to Get Rid of Green Algae on House Siding
- How to Clean a Green or Dirty Vinyl Fence
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