Posted by Bob M on July 10, 2008 at 11:52:28 from (151.190.254.108):
In Reply to: OT: What is this? posted by Dan-IA on July 10, 2008 at 08:39:15:
I agree with tjdub - that’s definitely lichen. Where I live the stuff will grow on almost any hard, non-metallic surface – rock, wood, concrete, asphalt roofing, etc.
Easiest way to remove it is to hit with a pressure washer. The water insures no dust (to which some people are sensitive) is raised. Alternatively you can wet the lichen down then go at it with a scraper or wire brush. Or it can be killed by treating with a copper-based fungicide (copper sulfate, etc) then scrubbing. Bleach works too but it’s not as effective (lichen is an amazingly tough stuff to kill...)
On wood surfaces lichen’s return can be prevented by treating the surface with copper- or zinc-bearing paints/stains. On roofing a strip of bare copper nailed along the roof peak will leach sufficient metal onto the roofing when it rains to prevent lichen’s return.
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