The Manufactured Housing Forums

A couple small points - Yes, you can paint right over the wallpaper - use Kilz or something similar first, to prime it and help the top coat adhere. Also, see what the subfloor is made of. Many (including mine) are made from wax - impregnated particleboard, which will swell if moistened. Plywood or ...

I'd pull it all out (thus taking care of any moisture issue) and then use 3/4" exterior plywood.