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Old 05-09-2012, 03:54 PM   #5
Jimbo
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Join Date: Mar 2002
Location: S. Yarmouth, MA
Posts: 1,508
I don't know the actual how-to, but my father lives in Yarmouth and had his roof replaced last year. The contractor looked at a house nearby and pointed out the black stains. He said it can be taken care of by putting strips of zinc along the top of the roof. I don't know if it's true, just something I heard. My brother works out on Long I sland and he said they do it there, too.
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