Lichen on Roof Shingles: Baking Soda or Copper

Lichens on asbestos shingles: no labeled products, but baking soda or copper fungicide work (used for ball moss).

Test First

1. Small area: 1 tbsp baking soda/gal water OR copper fungicide per label.
2. Check for staining after 24 hrs.
3. If safe, treat full roof.

Why Not Bleach

Bleach may discolor shingles. Baking soda/copper safer.

Note

Lichens return—roofs are perfect habitat. Periodic treatment needed.