Our roof is one large sheet of aluminum laminated over plywood and folded over the edges. The edges have a corder molding cap that is sealed with the butylene caulking. This type of caulking is pretty tough stuff and made for these types of applications. With out a tramatic event like an accident or a tree strike it will last a good long time. My last RV was over 15 years old before I had to attend to the roof caulking. It was stored outside in direct sun light and the touch up was minimal. I bet todays materials are even better...
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T2000 Complete (but never finished)
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