Fibrex Window Replacement in Fort Worth, TX

What Fibrex Actually Is and Why It Matters

Fibrex is Andersen's proprietary composite material, made by combining reclaimed wood fibers with thermoplastic polymer and extruding the result into rigid window frame profiles. The wood fibers come primarily from Andersen's own manufacturing operations, where they would otherwise be sawdust waste. The result is a frame material with the dimensional stability of fiberglass, the dark-color heat tolerance that standard vinyl cannot match, the rigid structural behavior that allows narrow sightlines, and the eco-credentials that come from using roughly 40 percent reclaimed wood content. For Fort Worth homeowners weighing replacement options, Fibrex sits squarely between vinyl and fiberglass on price while offering many of fiberglass's performance advantages.

Andersen offers Fibrex in two primary product lines that Fort Worth homeowners encounter regularly. The 100 Series is the all-Fibrex value line—the entire frame is the composite, with thinner sightlines and dark color options that fit modern architectural styles. The Renewal by Andersen line uses Fibrex on the interior frame and exterior cladding, often paired with traditional double-hung and casement geometry that fits more classical homes. Both lines deliver U-factors below 0.30 with Low-E argon-filled glass and meet ENERGY STAR Southern requirements comfortably.

Where Fibrex really shines is dark colors and large openings. Standard vinyl in dark exterior colors can heat-bow under direct Texas sun—the frame absorbs solar energy, expands more than the glass, and produces visible distortion. Fibrex, with its lower coefficient of thermal expansion and more rigid composite structure, holds dark colors without distortion. Black, bronze, and rich exterior finishes are routine on Fibrex installations across Heritage, Alliance, and the modern farmhouse builds spreading across north Tarrant County.