Hi Randrx2 and Road Dog,
My Winnebago roof is definitely not fiberglass.
Motor Home Component Information (MHCI) sheet for my 2014 Minnie Winnie, failed to list the actual roof material used on my RV. So I wrote Winnebago with my RV model (and serial number) and received this reply:
“I have attached documentation of the Dicor TPO Roof that you have on your motor home.”
Information Winnebago sent to me was for BriteTEK TPO Plastic roof made by Dicor Products.
So... my Minnie Winnie roof is not fiberglass, not EPDM (rubber)... but TPO Plastic (thermoplastic olefin). Dicor website calls it a thermoformed flexible plastic.