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Fiberglass Manufacturers Directory
The market expands

Best Manufacturers

Fiberglass windows are not as common as other types of windows today, although more and more window manufacturers are considering producing this new type of window.

Fiberframe Windows

Offer a number of fiberglass options, focusing on energy efficiency and physical strength. See site for details on available windows. Read More


Milgard was one of the first major window manufacturers to begin production of fiberglass windows. It currently offers the Ultra Series and WoodClad of fiberglass windows Read More


Marvin offers a line of replacement windows called Integrity that provides high performance and low maintenance. These fiberglass windows come in single/double hung, glider, and polygon.

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Pella offers a line of windows made with Duracast® - a fiberglass composite that is 9 times stronger than vinyl and twice as strong as aluminum. Pella Impervia® replacement windows come in single/double hung, fixed frame, sliders and special shapes. Read More

Interested in learning more about the best Fiberglass Window brands? Fill out our no-obligation Fiberglass Windows quote request form and we will put you in touch with someone who can answer all your questions!