Roof Cleaning San Francisco CA
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Our 3-step roof washing process is safe, effective, and designed to protect your home. First, we gently brush off any heavy moss buildup from the shingles and bag it up for disposal. Then we apply a bleach-based cleaning solution that kills moss, algae, and lichen at the root. We let the solution dwell and naturally break down the organic growth over time. We thoroughly rinse surrounding plants before, during, and after the application to ensure they stay protected. From moss-covered shingles to dark streaks and organic stains, we safely handle it with care to restore the life and appearance of your roof.
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WHY CHOOSE US?
Not all roof washing service providers are created equal. Some use high pressure or careless techniques that can damage shingles, void warranties, or harm surrounding plants. At Big City Softwash, we’re a bit more methodical than that. Our soft washing methods are safe, proven, and specifically designed for delicate roof surfaces. We don’t rush our work, and we never skip the details – from brushing moss carefully to protecting your landscaping with thorough rinsing. We like to show up on time, have clear communication, and treat your home like it’s our own. A roof wash is a smart investment, and we’re sure you’ll be happy with your decision to get one.
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Frequently Asked San Francisco Roof Cleaning Questions
Will the bleach solution damage my plants or landscaping?
No — we take multiple steps to protect your plants. We thoroughly soak all nearby landscaping before, during, and after applying the roof treatment just in case there’s any overspray. This sufficiently dilutes any runoff or overspray that makes it to the plants.
Do you rinse the roof after applying the cleaning solution?
No – and that’s by design. After brushing off the moss, we apply a bleach-based solution that stays on the roof to kill moss, lichen, and algae at the root. Over time, the dead growth breaks down and washes away naturally with exposure to rain, sun and wind. Rinsing would reduce the effectiveness of the treatment.
How long will it take for the moss or stains to disappear after treatment?
Some results are immediate — especially for dark streaks — but the remaining moss and lichen may take several weeks or months to fully detach and wash away on their own. That’s normal. The solution kills the growth at the root, and nature takes care of the rest.
How often should I get my roof washed?
Most homes benefit from a roof wash every 3 to 5 years, depending on shade, moisture, and roof material. If you start to notice moss, lichen, or dark streaks returning, it’s a good time to schedule another treatment. Regular cleaning can extend the life of your roof and preserve its warranty.
Why don’t you offer roof washing for tile roofs?
Unfortunately, we don’t currently offer roof washing for tile roofs. That’s because soft washing isn’t very effective on tile — it typically requires high-pressure cleaning to remove the organic growth thoroughly. And since walking on tile can easily crack or break the tiles, it’s not safe for us or for your roof. To protect both, we try to stick to asphalt shingles only. However, we can do tile roofs under certain circumstances.
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