Holes in Fiberglass Roof
Can someone suggest what might be happening with the fiberglass roof on my 2005 Newmar Kountry Star 5th wheel? I've owned it for about a year and a half, and see no evidence the roof has ever been coa...
Forum Discussion
HarryB1 wrote:theoldwizard1 wrote:The roof is not constructed like a boat's hull, but rather has a thin layer of fiberglass which is bonded to a fabric backing with a total thickness of about 0.030". When I was replacing the skylight I had to be very careful as I was removing the old caulk to not puncture the roofing material because it is quite flexible, and I did puncture it in one spot.
If this is truly fiberglass, then it is built like a boat, probably like the deck/roof; resin and 'glass over plywood or foam core.
My guess is that those spots are "dry spots" where the 'glass was not thoroughly wetted. It should be repaired using the same steps you would for boat repair. It dies seem odd that a fingernail can dent it as fiberglass cures very hard.
(snip)Click For Full-Size Image.
Known as Fiberglass Reinforced Panel (aka FRP) which is a thin plastic (polyester resin) material with fiberglass fibers in the material and it typically glued to wood or foam substrate.
Typical fix is using Polyester resin/fiberglass materials and techniques.
It is also referred to as "Filon" which is a brand name..
FRP material for RV roofing
The website above also has Maintenance and repair manual HERE which you may find helpful.
Roof application can be a bit problematic to repair since the repairs must be able to withstand large expansion/contraction cycles from large temperature swings. The repair manual mentions "two part flexible spot filler", not all over the counter fillers sold in retail stores are flexible so you might want to check with a autobody shop that deals with fiberglass repairs or a boat shop..
