Happy to be here and be reading through some of the excellent posts that have already been very helpful in our trailer repair journey. Earlier this year my mother-in-law purchased a 1999 Forest River Sierra as a retirement home and she plans to live in it year-round on our property in southern BC, Canada. As we were winter readying it this year we discovered some major water damage from a leak in the fiberglass siding in the back corner and from around the skylight.
We've pulled out all the rotted wood and insulation from the back exterior wall. We've replaced the frame (with pressure treated wood) and insulation (with foil lined dense foam insulation). We are working on replacing the roof wood supports/frames right now.
Now, when we pulled the exterior wall out originally, there was what appeared to be a paper product (layers of paper over a cardboard center), about 1/16 to 1/8 of an inch thick, that was lined between the fiberglass exterior and the wood frame + insulation. I'm having a lot of trouble sourcing this material and I'm not 100% sure what it was, if it was just like roofing/flooring carboard or something else?
I'm also not sure what it's purpose was and if there's anything better we should be incorporating to improve the wall/roof before we complete this project and button everything up tight.
Does anyone know what this paper-like product may have been; is it necessary (what's it do) and can we improve with anything else?
Thank you, Cassie
Last Edit: Sept 10, 2023 11:51:23 GMT -8 by miehem
Do away with the paper and cardboard. Both absorb water and add to the speed of rot. Replace with foam insulation.
Also, have you removed the skins to work on the trailer? The main leaks come from compromised putty at the edge trim and roof protrusions. That will need to be replaced as well as addressing the sills and joist below floor level.
Thank you so much! It's kind of what we thought but we didn't want to rule out its necessity without checking. We did call the two RV places in town and asked them but they never returned our call after our initial inquiry.
Last Edit: Sept 10, 2023 14:15:21 GMT -8 by miehem
Yes, we have removed the skin on the back we had to tear out and replace the entire back frame and part of the roof structure. It was all molded right out, crumbling. We plan to re-skin the roof and back panel.