Please forgive me if I go astray here but this is my understanding of the fiberglass siding option on an FWC unit. Please note that I don't have any direct experience with fiberglass RV siding--- I'm just reading the internet and jumping to conclusions
. If you see something incorrect, please don't hesitate to point it out.
- 'Fiberglass' in this case refers to a thin layer (about 1/16") of Filon-brand fiberglass-reinforced plastic (FRP) over 1/8" lauan plywood. I say this because of
this Truck Camper Magazine article where Tom Hanagan says "
We use a premium grade of Filon, laminated to a mahogany type plywood.."
(about halfway down the article) and then following that up with some searches for Filon.
- There are multiple grades of Filon and multiple grades of lauan plywood. I'd love to know exactly what product FWC uses as we see several interesting possibilities
here at Crane Composites (the trademark holder of Filon). In any case, reading through the Technical Data Sheets give us some clues as to why there can be failures of the product--- such as gluing the FRP to a substrate with a higher than 12% moisture content, adding dark-colored paints or decals, or using a heat-gun to remove decals. Crane attempts to control the likelihood of warranty claims by requiring pre-approval of the substrate and paints. (Note: I'm not sure FWC is using Crane Composite's Filon, by the way. The term is capitalized in that quote above but the term 'filon' is also used more generically in some contexts.)
- It's easy to find reports of delamination of Filon panels on the web. It's an industry practice to laminate Filon to a lauan plywood for sidewalls and a cardboard-like product called Unicore where curved panels are required.
This article explains the issue. I don't believe FWC uses any Unicore-- they don't need to --and Tom specifically calls the substrate a mahogany type plywood (which I take it means lauan).
- I'm guessing but I think FWC glues the Filon/lauan panels to the frame of the campers. If they were mechanically fastened, I'd think we'd see external evidence of it. That would also explain why they say its more difficult to repair. (Can anyone confirm?)
- A post above suggests it would be nice to have a fiberglass roof. I believe FWC fiberglass-sided units have the same aluminum roof as an aluminum-sided one. (Yes?)
I wouldn't hesitate to order a new FWC unit with fiberglass siding. For used, I'd be looking for delamination and would be hesitant to take a unit with evidence of water leaks or a moldy smell inside... just as I would be for an aluminum-sided unit.