Why exterior roof mildew along lines
I climbed up onto the roof of our 2014 KZ Spree trailer today and noticed mildew (or mold...I never know which is which) running along straight lines across the roof. I assume this is where the rafter...
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The mold is probably growing there because you've created a thermal band where a roof sheathing seam exists. The colder air inside the cabin is seeping out at that seam and creating the perfect temperature for the mold to exist. I wouldn't be too concerned as a quick wash of that area would probably cause the mold to disappear for most of the time. There are mildewcides that you could apply if it bothers you a lot. Original Listerine mouthwash is one and wouldn't be injurious to the rubber roof.
