Why Choose Marvin Fiberglass Door & Windows

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Highest Quality Inputs

The high percentage of lineal fiberglass in Essential, Elevate, and Modern products contributes to the long-term performance. Because of the high concentration of glass, Marvin fiberglass expands and contracts very little regardless of the changing temperatures. This stability means fiberglass windows and doors are less likely to experience seal failures, leaks, and stress cracks.

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Category-Leading Performance

Because of their strength, fiberglass frames and sash are typically narrower than other types of frames but are still able to meet the structural performance requirements. More streamlined frames and sashes create an uncluttered aesthetic with less frame, more glass, and bigger views.

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A Finish That Lasts

Marvin fiberglass offers a premium, smooth finish – unlike rough textured finishes on some competitive composite products.

Ultrex features an acrylic finish* that is bonded to the fiberglass through a proprietary process. The Ultrex finish protects against fading, chalking, and gloss retention.

The Marvin high-density fiberglass finish** is baked on at extremely high temperatures resulting in a finish that exceeds a high-quality aluminum car paint.

*AAMA 624 verified
**Undergoing AAMA 625 verification

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Strength

Ultrex fiberglass is 8x stronger than vinyl and 3x stronger than vinyl/wood composites. Fiberglass is incredibly rigid, which makes it highly impact resistant and capable of standing up to everyday wear and tear, especially in extreme weather conditions.

Fiberglass frames and sashes are less likely to bend and twist helping protect the structural integrity of your home.

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Superior Process

Ultrex and Marvin high-density fiberglass are created through a process called pultrusion. The pulling versus pushing action of pultrusion makes it possible for long, lineal glass fibers to become embedded and highly concentrated in the fiberglass as it is pulled through a dye. This high concentration of glass fibers results in superior strength and an exceptionally smooth and durable finish.