On my previous fifth wheel, on one of the slide side windows, the butyl tape was installed "starting at the top" rather than at the bottom. Where the two ends met, there was about a 1/4" gap and water would run into and under the butyl tape and out along the baseboard along the slide floor.
I pulled the window, cleaned off all the old butyl and replaced it, starting at the center bottom. It never leaked again.
It didn't start leaking at first, the RV was about 3 years old when we started noticing the damp carpet along the inner edge of the slide.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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