Replacing plastic undercarriage sheeting...

I've seen some of them and they're in bad shape. Spent time in LA and not stainless or galvanized so saltwater air and humidity got to them. Before I remove the siding, How are the walls typically held to the floor? Got to thinking, Once I get everything in motion to do a build thread. My biggest two challenges are replacing the undercarriage plastic material with corriboard and the plastic roof with aluminum.

Replacing the bolts is a big job. They are typically carriage bolts inserted from the top of the floor down through the holes in the frame ears.

Challenge is, the floor is bolted to the frame BEFORE the walls are put on. So to get at the top of the bolts, you have to remove part of the wall in that area.

What is the purpose of replacing the bolts?

You're a good guesser. Since I want to replace the mounting bolts once I figure it out, I was thinking with the bolts gone, To use leveling shims between the 2X4 and frame rail to "lift" the floor and slide sheets of corriboard between them. Repairing the current is almost impossible. Possum decided he didn't like it and shredded it pretty good. Not to mention, There is almost no insulation in the floor both from factory and what that little ....... took. Its also bunched up front and back from factory and looks like it can hold water.

Are you talking about replacing the woven looking plastic sheeting that sits on top of the frame rails and under the floor? Or are you talking about replacing the Coroplast (plastic cardboard) under the frame rails?

What are 2x4's are you talking about pieces of lumber, pieces of steel, or is the plastic in 2 x 4 foot sheets?

On a guess I'm assuming you are talking the woven plastic that is sitting on top of the frame rails. If that is so, the entire trailer is probably sitting on that plastic. You're going to have to find a way to unbolt the trailer from the frame and lift it enough to remove the plastic. You might be able to lift small sections and slide the plastic under but it will probably be near impossible to get it on smooth and unwrinkled.



You might consider just removing the plastic with a razor knife and doing the required repairs. Then have the underbody coated in spray foam by a contractor and skip replacing the plastic.

Good luck with the project, it doesn't sound like fun by any means.

Fema unit. Can't get any pictures right now, Busy fighting the wind and tarps.

Suggestions - Tell us exactly what trailer is involved, and post pictures if possible.