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The Disadvantages of Fiberglass Windows

Updated February 21, 2017

Replacement windows are a considerable expense for the average homeowner, so deciding which type of frames to use should not be taken lightly. Windows affect the feel and design of the home, but are also a functional element. Doors and windows are the greatest contributors to heat and air loss in a home, so the energy efficiency and insulating abilities of the products are important considerations. Fibreglass windows are energy efficient, versatile and strong, but they also have a few disadvantages.

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The lead time of a fibreglass window is long because the production process is labour intensive. Every fibreglass window is a custom window. Vinyl windows can be installed as soon as one week after the order is placed, but fibreglass windows take longer. With tight schedules on the job site, this longer lead time can be a major concern.


Fibreglass is the most expensive replacement window frame type. Fibreglass windows have an expensive manufacturing process and are not widely available. The small number of fibreglass window manufacturers lowers the supply, also increasing costs. Shipping long distances can also significantly raise costs.

Colour Fading

Fibreglass windows are available in only a few colours, and the darker colours tend to fade over time. However, unlike vinyl replacement windows, fibreglass windows can be painted.

New Process

Because fibreglass windows are a new offering in the marketplace, manufacturers are still refining the process and long-term stability of the product is unknown. Claims made about the longevity of the window frames are estimates at best.

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About the Author

Chasity Goddard has been writing poetry, fiction and nonfiction since 1996. Her work has appeared in "Backspace" magazine, "Sepia Literary Magazine" and the "Plowman Press." Goddard holds a Bachelor of Arts in creative writing with a specialization in women's studies from the University of Tennessee.

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