We thought our 10 year old asphalt shingle roof was nearing replacement time because it had discolored, had dark streaks and overall a dingy look. After some internet research I came across some articles on roof washing. I was of the opinion only tile roofs had this done. Anyway, for the cost of this as opposed to replacement i'm having my roof washed next Friday. I'll let you know how it comes out....
Ad..."Is your roof looking dirty? Have you noticed black streaks ruining the appearance of your roof? These black streaks are what is called gloeocapsa magma, which is an air borne type of algae that clings to your roof, slowly eating away at your roof, resulting in your roofs lifespan to shorten if left untreated."
Cost is $200 to $400 and supposed to last at least 5 years. There are several companies in the area that do this, it's NOT pressure washing it's no pressure chemical cleaning that is approved by all the major manufacturers of asphalt shingles...
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