Fiberglass windows

Integrity windows and doors are made with Ultrex®, a pultruded fiberglass patented by Marvin that outperforms and outlasts vinyl, roll-form aluminum and other fiberglass composites. Marvin uses Ultrex and a proprietary pultrusion process to manufacture high-demand windows and doors that endure all elements without showing age or wear.

Ultrex fiberglass is eight times stronger than vinyl and three times stronger than vinyl/wood composites like Fibrex. It resists fading, chalking, peeling and cracking, giving you unparalleled strength and durability.

Integrity wood/Ultrex windows are constructed of Ultrex with wood interior giving you the look and feel and warmth of a traditional wood window with the strength and durability of Ultrex.

Integrity All Ultrex windows give you a sleek, contemporary look with minimal sash lines and maximum glass area.