Roof Cleaning San Francisco CA

No — we take multiple steps to protect your plants. We thoroughly shower all nearby landscaping with water 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.

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.

The dark streaks disappear immediately, but the tiny bits of dead moss stuck between the shingles will take 6 months to a year to fully detach and wash away in the rain and wind.

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.

We don’t currently offer roof washing for tile roofs 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 your roof. To protect both, we try to stick to asphalt shingles and flat style roofs only. However, we can do tile roofs under certain circumstances.