Originally Posted by kokomoscalls
just pulled up the diagram and it looks to be right ( whats currently on my trailer) its a formed floor channel for the front curved section and just floor channel for the side sections.. this doesnt look liek a good setup because what ever water gets thru the beltline trim would go directly down into the sides of the plywood( probaly why it rotted so bad in that area. i wonder if i could run flashing under the endcap panels ( between the endcap sections and the c- channel down past the edge of the plywood to prevent this.
The problem is that while an extra piece of flashing under the outer skin would help the water shed down and miss the edge of the plywood, you also can have leaks where the water goes in-between the inner and outer skins. Water that gets in-between can then collect in the c-channel and will eventually leak down and saturate the plywood, either through some of the bolts to the frame or just around the edges of the metal. That's why many leaks go undetected, its all hidden inside and the water can travel quite a bit from the initial point and collect several feet away.