DIY leak pressure test
I've found that I had a small leak in my RV roof at the end of the season last year but couldn't find the source. I kept it covered during the rainy winter (along with a dehumidifier) and figured that...
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I've read (here, I think) that a shop vac can also be effective. If I were attempting to do this sort of test in a DIY fashion, that's what I would try first since I already have one.
