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Exceptionally strong and low-maintenance

Fiberglass Windows

Fiberglass frames are composed of glass fibers and resin, materials that expand and contract very little with temperature changes. Fiberglass windows and patio doors are becoming more popular among homeowners for its beauty and long-lasting durability.

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Advantages of Fiberglass Frames



We're proud to offer the best fiberglass replacement window products available in the industry

Fiberglass window and door frames from Milgard are ideal for any style and climate

The process Milgard uses to create their fiberglass window and patio door frame lineals is called pultrusion. Glass rovings and mats are pulled at tremendous forces through a resin bath and a series of dies. These materials combine and catalyze to provide tensile and torsion strength. Milgard regularly tests its fiberglass lineals for color uniformity, gloss, film thickness and chemical resistance for quality and long-lasting performance.