For anyone with a Winnebago with a fiberglass roof check the chaulking at the drip rail where the roof meets. On my 2013 Itasca 26he there was a seam open almost all the way down both sides of the roo...
funny, I just did this job yesterday on my Itasca class C. only had to seal about 4 feet. Rest was good. I don't use silicon either, it doesn't stick well to the fiberglass top. Hard to get cleaned off also.