I did the roof on mine. It was 3/8" ODB and stapled in place. Its not difficult, just time consuming. I put up scaffolding and would suggest anyone trying this to do the same. The material can be purchased at roofing supply co. It was $5.50 per running ft in 10' wide. So a 30' trailer would be $200 and change including the adhesive. You can probably expect all framing to be stapled as well. I used glue and screws and all seems well. The inside is tougher as its difficult to match what is there. I hope this helps. Any questions you can post or PM me.