Fiberglass ladders are used by professional builders and do-it-yourself enthusiasts because of their desirable properties. Unlike wooden ladders, they do not rot or split and unlike aluminum ladders they do not conduct electricity.
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The average lifespan of a fiberglass ladder depends on the location in which it is used, the way in which it is handled and whether or not it is regularly maintained. A fiberglass ladder that has not been maintained at all can be expected to last between one and three years, but its lifetime can be extended by periodic washing and waxing.
Fiberglass is not as porous as wood, but can nonetheless absorb moisture to some degree. Moisture can accelerate the surface degradation of a fiberglass ladder, particularly in warm climates. Regular waxing reduces the rate at which moisture can penetrate the surface of the ladder.
Exposing a ladder to high levels of ultraviolet (UV) radiation from the Sun, also accelerates its degradation. UV radiation can penetrate wax, but you can protect a ladder by coating its surface with acrylic lacquer or polyurethane.