Wrapping that insulation like that scares me. When I put the floor down I planed on it leaking. I sealed with an epoxy resin both sides and then put a sheet vinyl floor down before the C-Channel.
My though was this:
Eventually its going to leak and its a given that it WILL happen. Hell it leaks already. So I wanted to prevent water from getting to the floor from above at all and the sheet flooring should do the trick. When it leaks it will have to go to the edge of the trailer and leave over the edge. The flooring should also form a gasket where cabinetry is bolted to the floor to further aid in keeping moisture from the top.
They way you have that wrapped if water does get in it will have to run between that insulation and the wood floor to go down hill. The insulation looks mighty water proof and retaining. I would think it would keep the water trapped against the wood instead of allowing it to drain down.
I decided I didn't want any insulation between the deck and frame at all. Some of the worst rot in the frame I had was from water wicked into the fiberglass between floor and frame. Don felt the same way as I did. Right now I have no floor insulation at all but I really don't plan to do any winter camping. If that changes I can add it back and install it the way Don did. He put some stingers out of aluminum bar stock to hold up the insulation without it being between the deck and frame.
Actually I am digging this break for the sun and heat even though the rain came. I need to run just a couple more wires in the ceiling today and I can pretty well button it up except for when I put in the new TV antenna when I get that. So One drain line, one running light wire and one 12v Circuit and an and done pulling wire! Yee HAAAAAA
