Hey guys, take a look at these photos. Is this algae that’s causing the staining to the shingles along the headwall and sidewalls, just decelerated fading due to the large overhangs, or something else entirely? Thanks in advance for your advice.
Ralph, it looks like dirt staining from power washing the siding BUT I can’t zoom in enough to tell otherwise. I really think it’s dirt, though.
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It’s algae. Notice it’s only where the sun doesn’t shine.
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From here it looks like an overspray of something. The siding appears to have a fresh paint. I bet the staining is related, at least in part, to what was done during the (spray?) painting. It does not show a uniform pattern of organic growth.
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Simon, I thought the same thing originally, but black in color? Surely they weren’t spraying the siding black, maybe they drank the Flex Seal Koolaid??
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You mean I have algae up…never mind. 
I’ve only seen something like this one time and it took me some time to figure out it was soot coming from the attic.
look under the eaves between the fascia and other possible air leaks from the attic.
I’m not saying that’s what it is but that’s the only time I’ve seen anything like this.
From here it looks like they had white overspray from painting the siding and attempted to cover it up with black spray paint. The patterns look too random to be caused by soot or algae. Look out it overlaps on the flashing.
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When you enlarge the photos it’s clearly overspray. Photo #1 shows some algae mixed in.
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I’m thinking Joe might be on to something here…bad spray job and worse repair would be my guess
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From here, I agree with Joe and Simon on the black spray, how it happened we won’t know.
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I think you are right Joe it looks like can spray paint.
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Could that be black spray paint to hide white overspray from the siding?
“Could that be black spray paint to hide white overspray from the siding?”
Then you agree with the 4 posts directly before your own. 
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I thought it was algae too, until I zoomed in. It does look like overspray. I don’t know.
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