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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