Mike Lamb Posted July 8, 2020 Report Share Posted July 8, 2020 What do you think would cause the black streaking on this roof cover? It reminds me of black algae on the north side of the shingles roof but I don't think I've seen this before. The roof was in good condition and I would estimate around 10 years old or so. Link to comment Share on other sites More sharing options...
Chad Fabry Posted July 9, 2020 Report Share Posted July 9, 2020 Is it coming off the ugly coping goo joints? Link to comment Share on other sites More sharing options...
Les Posted July 9, 2020 Report Share Posted July 9, 2020 at some point it likely was swept? the streaks remind me of carbon - nearby fire? Link to comment Share on other sites More sharing options...
Marc Posted July 9, 2020 Report Share Posted July 9, 2020 (edited) Maybe it's from the squeeze out at the seams. You don't see as much streaking at the sides of the roof where he water flows sideways on account of the sag in the joists. Edited July 9, 2020 by Marc Link to comment Share on other sites More sharing options...
Erby Posted July 10, 2020 Report Share Posted July 10, 2020 Probably just the same algae you see on shingle roofs streaking down the slope. Link to comment Share on other sites More sharing options...
Jim Katen Posted July 11, 2020 Report Share Posted July 11, 2020 Reminds me of when I was a kid. We went to visit my cousins in Pittsburgh and all went out for vanilla ice cream cones. My cousins showed me how if you just hold up your cone in the air for a while without licking it, a grey film formed on the ice cream and dripped down it in streaks - just like the streaks in those pictures. According to them it was coal dust, which was thick in the Pittsburgh air in the '60s. They insisted that it made the ice cream taste better. Did this roof taste better? 1 1 Link to comment Share on other sites More sharing options...
Amazon Posted August 6, 2020 Report Share Posted August 6, 2020 People who live in humid areas are likely to experience the problem of algae growing on their asphalt shingle roofs. These people know that it is not a pleasant sight. The dark streaks covering the roof are really bad for aesthetics it just doesn’t look attractive at all it just makes your roof look dirty, dull and un cared for. Link to comment Share on other sites More sharing options...
Les Posted August 6, 2020 Report Share Posted August 6, 2020 2 hours ago, Amazon said: People who live in humid areas are likely to experience the problem of algae growing on their asphalt shingle roofs. These people know that it is not a pleasant sight. The dark streaks covering the roof are really bad for aesthetics it just doesn’t look attractive at all it just makes your roof look dirty, dull and un cared for. very insightful. thanks for the reminder. 1 Link to comment Share on other sites More sharing options...
ejager Posted August 27, 2020 Report Share Posted August 27, 2020 Reminded me of tire skid marks... Skateboarders? 🚲 Link to comment Share on other sites More sharing options...
George Pip Posted September 2, 2020 Report Share Posted September 2, 2020 (edited) The most effective method of cleaning algae and moss from a roof is with a 50:50 mix of laundry strength liquid chlorine bleach and water. Apply with a sprayer and allow the solution to dwell on the roof surface for 15 to 20 minutes, and then rinse thoroughly with low pressure water. Edited September 3, 2020 by Bill Kibbel Link drop from Pakistan. Link to comment Share on other sites More sharing options...
Erby Posted September 3, 2020 Report Share Posted September 3, 2020 LInk droppers abound. Link to comment Share on other sites More sharing options...
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