Fiberglass roof Delaminated

[Howie]

The thin fiberglass roof sheeting has come delaminated from the plywood sheeting in a few areas. No cracks or leaks but it is raised a half inch or so and if I step on it it flexes up and down.
Is this common and will it cause a problem?
What can be done?
2005 Seabreeze 1321 F53 Ford

[kennersonf]

It seems this is a common problem with National motorhomes and unfortunately they wet out of business to address the issue. I have had delamination along the entire edge from front to back on both sides of my roof. I noticed this several years ago. Through my travels across the US I have looked at other National motorhomes in RV parks and most have the same problems. Many of the owners didn't even know they had a problem. I have talked to several places and to resolve it, a completely new roof piece has to be put on. My roof doesn't leak so I just keep a close watch on it. Here's a link to a similar post http://www.irv2.com/forums/f105/fibe...ion-66611.html By the way, I've been quoted a price of about $4000.

[MikeandRuth]

The roof skin is not glued in place. It is floating so it can expand and contract with temperature changes and not stress the seams.
Everything mounted on the roof pins it down and those bubbles down the full length of each side are there to allow for expansion and contraction.
When you walk on the roof, stay about 6 inches from the edge to not stress the expansion bubble.
I have the Mfrs brochure. It is a purpose built roof skin, not just another fiberglass panel.