Black lines/spots on top of roof where trusses are

[mikegray]

Have some black streaks across the TT over the trusses I'm guessing?? Any idea of what to do about them? Cover with Eternabond tape in case they leak?
Mike

[DonaandDon]

A picture is worth a thousand words.

Eternabond is a good thing.

[RogerR]

I would like to know also. Even with some scrubbing I can't get rid of all the black line on mine.


Here are a couple of pics I took when I went up to do spring cleaning. I did not take an after picture when I finished cleaning but the line was still very apparent.


The lines are at the edge of each plywood piece on the roof. There is a small feeling of a bump under the rubber roof. Over two years it has not become a lot worse..

[JFlightRisk]

We have the same marks on our roof, and found they are still there even after some diligent hands-and-knees scrubbing, but they are a little less pronounced afterwards. I'm not sure what they are, but I'm not worried about them any more.

[mikegray]

I just put Eternabond Tape on all my lines. Hope that keeps anything from leaking in the future.
Mike