Why Choose Ultrex?


Ultrex pultruded fiberglass, a material patented nearly 20 years ago when we pioneered the fiberglass windows and door category. Integrity windows have led the category ever since with a commitment to a product that’s tough, smart, long-lasting and worry-free. They don’t just claim Ultrex pultruded fiberglass is the toughest window material available. They prove it. Through a variety of punishing tests in harsh conditions, Integrity windows made with Ultrex comes out on top again and again.



The elements can break down a window, unless it’s an Integrity window. Ultrex resists harsh corrosives, remains stable in extreme temperatures, and expands at nearly the same rate as glass. This means your windows maintain integrity to keep their seal and don’t leak.



Ultrex fiberglass is eight times stronger than vinyl and three times stronger than wood/vinyl composites. That’s as tough as steel. As your home ages and settles, Integrity windows stay true and resist sagging—proving that they’re truly built to last.

Superior Finish


Beauty keeps up with age when it comes to Integrity windows. Ultrex fiberglass provides a superior, consistent finish that can be painted, even in dark colors, without voiding the warranty. No-worry durability was top of mind when they developed the patented, high-performance coating process that lets all Integrity products look as good on the outside as they are tough on the inside.



Ultrex fiberglass is 500 times less conductive than aluminum, which means homes retain their heat in the winter and stay cooler in the summer. This can mean big savings on heating and cooling a home, which we can all agree is a good thing.


We currently have two special offers from which to choose. Click for details.

$500 Off Your Project