The black staining is common here in south east Pa. I don't think it is only one brand of shingles, but more due to ambient humidity levels and sun exposure. Our home roof ridge is east/west. The south side of the roof is clean. The north side of the house and east/west sides of the perpendicular garage roof all have the black staining. Shingles are Elk installed in 1997. 40 year rating. Elk was acquired by GAF.
What was the effect to any landscaping due to the spray or roof run off? From reviews/questions on amazon, it seems ok for the plants.
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1863, 1864, 48" and 54" mower decks, 54" snow plow, 451 snow blower, TracVac 580
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