The Best Way to Clean Algae Stains From a Roof
- Algae is a living organism. A strong solution of chlorine bleach and water will kill the algae on the roof. The bleach solution can be sprayed on the roof with a pump sprayer.
- Clambering atop the roof, especially a steeply pitched roof, is no easy job. A roof harness and slip-resistant shoes can help provide protection. Bleach will damage or kill plants. Foundation plants can be wet down or covered with plastic before you spray.
- To prevent future formation of algae, strips of copper or galvanized metal should be attached to the ridge of the roof. Shingle manufacturers now make algae-resistant shingles.
- Chlorine bleach is a harsh chemical that may harm the lawn or other plants. Oxygen bleach is a suitable alternative, and will not harm the environment.
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