mildew lines on roof

Question

Looking at the roof of my 2015 salem there are what looks like 1" wide black mildew lines every 4 or 6 feet going across the roof which seems to follow internal stringers.   Is this normal?  The roof was last washed around September using murphys oil soap.  The lines are very pronounced and defined and it seems wierd that the coincide with the internal roof structure.

tnriverside · Answer

I have the same issue. The seams between the 4' X 8' sheets of roofing creat a low spot that collects water. This valley holds the moisture and allows mold to develop. I was a roof cleaning spray and soft brush to remove the mold. Not a big issue.

larrychris · Answer

I have a 2014 5th with the same issue. Does anyone know why this is happening? Is there something we need to be concerned about?

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mildew lines on roof

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