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Fiberglass Window Frames

Exceptionally strong and low-maintenance. Fiberglass windows are ideal for any style and climate. Fiberglass material tolerates heat and cold while it resists swelling, rotting, and warping, making fiberglass windows durable and low-maintenance with little upkeep required.
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Strength, Durability, and Energy Efficiency

Beautiful and contemporary, fiberglass windows are strong and built to last. Ultra™ Series windows have fiberglass frames inside and out and are available in four exterior colors. Each color can be paired with a white interior. Harmony, Bark and the popular Black Bean are available with a color-match interior. Fiberglass resists swelling, rotting and warping. The frame expands and contracts at about the same rate as the insulated glass it holds for improved energy efficiency, strength & durability. While fiberglass frames do not require repainting for upkeep, the material can be repainted if you desire to change the colors down the road.

Milgard® Fiberglass Window Frames
– Fiberglass Pultrusion

Fiberglass windows are known for their durability, stability and strength. Learn the processes and meet the people behind Milgard fiberglass windows and doors, and why windows are more than just glass. Milgard® is one of the leading fiberglass window manufacturers.

Advantages of Fiberglass Window Frames

  • Traditional wood profile.
  • Extremely strong – can hold large expanses of glass.
  • Low maintenance.
  • Paintable.