A partner in performance, not just a supplier.

About GlasFëns

GlasFëns Window Systems USA is a supplier of high-performance windows, doors, and façade systems for buildings across North America. Our focus is fiberglass, with aluminum for hurricane and high-wind applications, all based on proven European systems and fitted with German hardware. We exist to do one thing exceptionally well: deliver energy-efficient fenestration that performs at the highest level, approaching zero.

We build lasting relationships with developers, architects, contractors, and glazing contractors by pairing our products with real industry knowledge and hands-on support. We're not just a supplier; we're a partner through specification, value engineering, and delivery, helping projects hit their performance targets without surprises along the way.

Our systems are built for commercial, multifamily, hospitality, modular and PHIUS-certified construction. Each one is engineered to order and built to the most demanding standards of thermal performance, security, acoustics and design. Our standard glass package is a hybrid insulating glass unit with vacuum insulating glass, reaching R-23 at the center of the glass; a complete GR85 fixed window reaches a whole-window U-value of 0.085 (R-11.8).

Our components come from manufacturers who have been producing window and door systems for generations, recognized leaders across Europe, with hardware from Roto, Siegenia and G-U, all engineered and made in Germany. That precision and attention to detail is what makes a GlasFëns system perform, quietly and reliably, for decades.

The fiberglass itself starts in America. Our frames are pultruded with polyurethane resin from Huntsman Advanced Materials, part of Huntsman Corporation, headquartered in The Woodlands, Texas. Polyurethane is the premium resin for pultrusion: it costs more than the polyester used in most fiberglass windows and takes more exacting equipment to process, and it makes a tougher, stiffer, more crack-resistant frame.