More and more commercial contractors are turning to Marvin Windows and Doors to meet their needs for attractive, reliable, low-maintenance fiberglass windows and doors. With more than 20 years serving apartments, condominiums, dormitories, assisted living, HUD/public housing authorities and more, their current installations are living proof that Ultrex lives up to its claims for strength and durability over the long term.

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

The facts prove it. Ultrex fiberglass is eight times stronger than vinyl and three times stronger than vinyl/wood composites. It resists fading, chalking, peeling and cracking, giving you unparalleled strength and durability. Marvin is constantly testing Ultrex to prove it’s the toughest window material available.

Wood-Ultrex Windows and Doors
Using Ultrex Fiberglass exterior paired with a rich wood interior, Wood-Ultrex has both strength and beauty.

All Ultrex Windows and Doors
Constructed with Ultrex from the inside out, Marvin All Ultrex offers outstanding strength and durability.