We have had significant leaks in our fiver. The butyl tape and caulk reached their limit. In one instance, by the time the problem start coming through the paneling, the insulation was soaked and most of the framing had to be replaced. I learned alot needless to say the hard way. If you take off the corner trim, use new butyl tape and the right caulk (preflex etc..not 100% silicone from a box store) If i can figure out how to insert photos, i'll show the front and the back of ours. Good luck.