Fiberglass RV Roof Repair in Yorba Linda

Four things, in rough order of frequency. Gelcoat crazing, which is a network of fine surface cracks from ultraviolet exposure and thermal cycling. Stress cracks radiating from a penetration corner, usually a skylight or a vent opening, where the laminate is locally weakened by the cutout. Impact damage from a branch or a low structure. And soft laminate, where water has reached a cored section and the core has failed.

Crazing is cosmetic until it is not. The crazing itself does not leak, but it does hold water in the surface and it does propagate over time. Left long enough it opens into genuine cracks. The correct treatment is to sand back the crazed gelcoat, apply new gelcoat or a modern coating system, and cut and polish it out.

Stress cracks are the diagnostic problem. A crack from the corner of a skylight opening is telling you the panel is flexing at that point, which means the reinforcement around that cutout is inadequate or has debonded. We grind the crack out to a V, laminate glass reinforcement in from below or above depending on access, and then finish the surface. Adding local stiffness is what stops it returning.

• Gelcoat crazing from ultraviolet exposure and thermal cycling
• Stress cracks radiating from skylight, vent and air conditioner cutout corners
• Impact punctures and gouges from branches and low structures
• Soft laminate where water has entered a cored panel
• Failed sealant at penetrations, exactly as on a membrane roof
• Cap to roof seam failure at the front and rear joints

By restoring the laminate, not the surface. The crack is ground out to a V or a scarf, the surrounding gelcoat is removed back to sound laminate well past the crack ends, and the crack ends are drilled to stop propagation. Glass reinforcement is then laminated in with the correct resin, feathered over a wide bond area rather than a narrow one, because a narrow repair creates a new stiffness discontinuity right at its edge and cracks again just outside the patch.

Where access allows, the more effective repair is from underneath. Laminating reinforcement to the inner face keeps the outer cosmetic surface intact and puts the added material where it does the most for stiffness. That is not always possible on a coach with a finished ceiling and an air gap full of wiring, which is why we assess access before quoting.

Finish is gelcoat or a modern topcoat, applied, blocked flat and polished into the surrounding surface. On a roof that has crazed generally, we often recommend refinishing the whole roof rather than a spot repair, because a polished patch in a matte crazed field reads worse than the original damage.

Yes, and this is the misconception that costs owners the most. The roof panel does not need maintenance. Every hole through it does.

Air conditioner gaskets, vent flanges, antenna bases, solar mount feet, plumbing vents and skylights are all sealed with the same materials on a fiberglass roof as on a rubber one, and they age at the same rate. The front and rear cap seams and the roof to sidewall joints are also sealed joints with movement in them. An owner who believes a fiberglass roof is maintenance liberated will typically discover the truth through a ceiling stain around year eight.

The sealant rules are the same as on any roof. Self-leveling on horizontal flanges, non-sag on vertical faces, old sealant removed rather than covered, and no silicone anywhere. Fiberglass has one advantage: a properly prepared gelcoat surface gives excellent adhesion, better than chalked EPDM ever will.