Algae

Published on February 7th, 2013 | by Henri

0

Bleach is safe to use on roof

Q.    Your reply to the person who wanted to remove lichen from a roof raises a question. I have used bleach to kill (but not really remove) lichen on my roof. Does your reply mean that bleach is not safe to use on asphalt shingles?

A.    Not at all; bleach is safe to use on asphalt shingles. In fact, many times over the years I have recommended a solution of three parts Clorox bleach to one part water as a way to remove algae that stains asphalt shingles, but it is not very effective with lichen or moss.

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