Turning Archive 2008

Subject:
OT -- bleach and asphalt shingles?

GaryG in MD
>I've got lichen growing on my roof, and I want to kill it.
One guy told me to use a cup of bleach per gallon and just spray it.
Another guy told me that he thinks his shingles were damaged when he tried to bleach mildew off the side of his house above a porch roof.

Does anyone have experience with bleach and asphalt shingles?
Compatible or not?
Concentration?

Thanks, Gary

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