I was sitting outside yesterday enjoying the weather.  As I was sitting there my mind started to wonder going from one thought to the next.  Eventually I ended up thinking about roofs.  I was wondering why one roof looked fine, like it did when it was new and other roofs looked so bad with black lines on them.  As my mind lingered on this thought it occured to me that most of the houses that had black stuff were partly shaded.  I was curious so I went to the computer and looked it up. I found that a roof cleaning St. Louis company that says this is the most common place for that type of algae.

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