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Old 04-12-2013, 09:37 AM   #1
newlandsj
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Black Stripes on Ceiling

Black stripes, almost looks like shadows, have appeared on the ceiling. They look to be exactly under each cross bean of the roof. There is no water leakage anywhere inside the RV. Wiping with a mild detergent doesn't do anything. Any thoughts as to what is causing this and how to get rid of these dirty looking marks? Also we do run a dehumidifyer all the time inside the RV.
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Old 04-12-2013, 10:36 AM   #2
hankpage
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You don't say what model trailer you have but I would think that you are getting some form of condensation between the ceiling and the roof. You may be able to remove the marks with "Mr Clean Magic Eraser" but they will most likely come back if you can not find and eliminate the source. Some higher end models have "Attic vents", perhaps something like this would help. Removing the interior trim from a roof vent may allow you to look into this space and help diagnose the problem. Let us know what you find out, Hank
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Old 04-12-2013, 01:38 PM   #3
JRTJH
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As Hankpage said, without knowing more about your RV and the marks you're talking about, most answers will be speculation. I'd think that if you don't have any water intrusion into the ceiling space, you're RV may have metal rafters that are zinc coated for rust resistance. If that's true, then you may be seeing some stain bleedthrough from the zinc.

How old is your RV and what type of rafters are installed?
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