If you can, post a couple of pics of the area in question.
Delamination in most cases is caused by moisture compromising the glue that bonds the Filon and base materials together. Inspect beyond the roof seam for possible moisture entry. It's possible that it could be a product defect/assembly unrelated to moisture intrusion, may take a visit to a Jayco dealer to confirm.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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