See also: 08 1580 - Plastic Windows (Residential & Light Commercial) - primarily vinyl

Graham Architectural Products
Our new generation of pultruded fiberglass windows combine structural and thermal advantages of "glass on glass" construction. Available in double-hung, sliding, dual action/projected, and casement styles. Paintable or shipped with factory-applied finish. Design flexibility. Fiberglass sash and frame offer superior wind-load resistance, thermal performance, structural strength, and corrosion resistance. Ideal for corrosive seacoast environments.

Milgard Windows
Our Ultra™ Fiberglass products combine an upscale look with unmatched performance - impervious to water, cold, heat, insects, salt air, and ultraviolet rays. The result: efficient windows that maintain their beauty in every season, and any climate. Choose from Ultra™ Fiberglass or WoodClad™ the strength of fiberglass with the warmth/beauty of VG Douglas fir.

Pella Impervia ![]()
The revolutionary, award-winning Pella® Impervia® product line, manufactured from Duracast® — the strongest, most durable material available in windows and doors — is now available for non-residential and multi-family projects. Pella’s exclusive five-layer Duracast fiberglass composite material is proven to be nine times stronger than vinyl and twice as strong as aluminum in tensile strength tests.
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