Corrugated Fiberglass Roofing Leaks

Corrugated Fiberglass Roofing

• Corrugated fiberglass roofing systems consist of panels made from compressed glass microfibers embedded in organic resin materials. Fiberglass provides a strong, durable, heat-resistant surface suitable for construction and roofing. The use of glass to manufacture the panels creates a translucent material that lets in light while keeping out harmful ultraviolet rays. The glass and resin material composite also make for a lightweight roofing material. Corrugated fiberglass panels appear on commercial and residential buildings.

Causes of Leaks

• Harsh weather, normal wear and tear, and improper installation can lead to leaks in corrugated fiberglass roofing. Exposure to heat and cold can break down fiberglass panels over time. Strong winds also can cause significant damage. While wind damage may not appear all at once, over time wind currents can weaken panel adhesive materials and loosen the screw fasteners that hold panels in place. For low-sloped roofs, improper drainage and water pooling can also break down panel materials and cause leaks.

Panel Replacement

• The panel design typical of corrugated fiberglass roofs makes it possible to replace specific roofing sections where leaks appear. As panel overlapping helps to reinforce the sealing effect created by fiberglass panels, make sure replacement panels overlap by a minimum of one corrugated fold. If a leak appears toward the edge of a roof, replacement and existing panels should extend 8 inches past the roof’s edge for low-sloped roofs and 6 inches for roofs with more than a 4- to 12-inch pitch. Screw fastener placements should line up with existing panels, with fasteners at the center and ends of panels.

Area Patches

• Patching an area of corrugated fiberglass panel may be possible depending on the location of the leak. The corrugated, or folded design of a fiberglass panel may pose a problem in cases where a leak forms inside a fold section. Leaks may result from holes or worn down areas on the roof’s surface. Fiberglass patch kits include a sealant material that binds a fiberglass patch piece to the roof surface. Before applying the patch, the damaged surface requires sanding and smoothing to ensure the patch forms an adhesive bond with the roof surface.