Here is what we found on our 1990 25ft. Classic when we repaired the upper walls for water damage. In hind sight we were not told to remove all the windows and use new butyl tape and Lexell caulk on the outside of the windows. UTube has a tutorial on how to do this. Yes, we found the same soggy brown paper. Start by lining the floor with cardboard and counter tops. Piece together and use duct tape. Pull all the wet material all the way to the fiberglass. We used a multi tool and plenty of blades. Our came from Harbor Freight. With the inside of the fiberglass siding exposed use Bondo to seal up any pinpoint holes you can't even see. Cover up couch with painters plastic. The wall layers consist of sheet foam insulation then 1/8th clear wood then 1/8th paneling with wallpaper on it. Look at Home Depot or Lowes for paneling ideas. We got our paneling at ACE hardware. We used Heavy Duty Liquid nails to put the layers together. Use a tube for each sheet of wall layers. Apply in a generous figure eight. DH used a floor roller to press the layers together. Have plenty of Lexell caulk and a can of expanding foam to fill in any voids. Yes, the sheets of fiberglass paneling are glued to the interior fiberglass wall. Use an industrial respirator when using bondo and follow all direstions. You won't be able to go in for several days until the bodo smell calms down. Before you remove the paneling make a measured drawing of the curtain hardware. If you can make a measured drawing around the window cutout. Our escape window was resealed with fresh weather stripping. Then it rained and we had to fix a small leak. Our family that has our 1990 HiLo reports that all is Hi and dry with no further repairs needed. Make sure your roof doesn't leak and is coated with the proper sealant. This all I can remember from 2014. Play your favorite music as you work. This makes the task a little more enjoyable. If my memory serves me well we spent about $1,000 in material and countless hours. The older HiLoS are sturdier than new RVS. Countless others on this forum have done rebuilds. Keep the questions coming. Start a repair blog. Liquid nails doesn't eat the foam.
