Roof Staining

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It's a type of mold?? How does this work? Are there any benefits?
 
It is actually a litchen, the same stuff you see on the sides of trees and rocks. The zinc just kills the growth. Kind of like how nothin grows on pt wood. The website www.z-stop.com tells it like it is.
 
Its just pieces of zinc metal strips, the rain grabs some zinc on the way down and it kills the mold. Presto, no more stains.
 

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