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Old 03-25-2015, 02:15 AM   #2
FW28z
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Brand: Thor Motor Coach
Model: 2011 Four Winds 28Z
State: Michigan
Posts: 1,273
THOR #531
Can't help you with your specific problem, but it's been my experience (mostly with boats) is that the source of a leak is often far from the area you find wet. Even 5 or 10ft away.

If they recaulked the windows, what about the windows themselves? Are the window schlegels any good? is the window-to-frame seals OK?

I would climb on the roof and look at every caulk joint on the roof, including the vents, TV antenna, sidewall-to-roof transition, and anything that has a hole or screw through it.

Water could very well be finding a conduit from the roof or sidewall and run several feet from the source.

You can also look into purchasing a moisture meter, but the cheap ones are for woodworking, and might not be sensitive enough for your purpose.

A moisture meter typically used for surveying fiberglass boat hulls is what you want, such as the Tramex Skipper Plus. They typically cost several hundred dollars (but you probably have or soon will have that amount invested in Camping World). Perhaps you could also rent one. Even then, a moisture meter might not locate the problem.

If Camping World or any service tech you take your RV to does not use a moisture meter, I'd skip them and find one that does.

If you buy a meter, you would use it to try and find a high-moisture path from the leak area to it's source.

But I think I would first look at every caulk joint on the roof and even upper sides of the RV and re-caulk anything that even looks suspicious.

And if you find anything exposed like a screw in the top or side, without any caulking on it - often a screw under compression can wick water like crazy (again from my boating experience). I have seen boaters damage their fiberglass boats simply by installing canvas snaps on the hull for a cover without using any caulking.

And I have seen dozens of screws in RVs from the factory without any caulking. It's a wonder there are not more leaks. You should always caulk any screw put into the sidewall or roof of a RV - no exceptions.
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