I should point out that I'm a rather experienced composite repair person with experience in both aviation and marine industries, so the thought of cutting off and reinstalling a thin piece of simple fiberglass on my coach roof doesn't phase me at all. However, for lots (most?) of people, it would be very intimidating, if still completely doable.
I hope that's helpful. Good luck with your repair and let me know if I can be of any more assistance!
Good evening! I just saw this message and apologize for the delay in replying.
If you're like me, you feel sick to your stomach. We love where the coach takes us, but it's definitely been a huge learning experience!
I pulled down the interior ply, treated the insulation and framing with Concrobium anti-mold spray, and replaced it with 1/8" thick luan plywood. I laminated the marine-grade, foam-backed vinyl to it before putting it up on the ceiling, as well.
I didn't replace the roof ply because I found that it wasn't damaged in our case. The water ran down the fan housing and into the interior ceiling, bypassing the exterior sheathing. If the exterior roof sheathing had been damaged, too, I would have cut off the section of fiberglass roofing over the damaged area and carefully saved it for re-application.
