Integrity Windows and Doors - 8 times stronger than vinyl
Why Ultrex?
Integrity from Marvin Windows and Doors are made with Ultrex, a pultruded fiberglass that outperforms and outlasts vinyl, roll-form aluminum and other fiberglass composites.

What’s the
Windows made of Ultrex Fiberglass have 8x the strength of vinyl, are 3x stronger than Fibrex and equal the strength of steel. Not only is Ultrex a more durable material, but it is superior in its resistance to fading, chalking, peeling and cracking.
Strength  |  Performance  |  Appearance 
Replace your windows with Integrity Windows and Doors
With Integrity Windows and Doors

Integrity windows and doors come in several classic and modern styles with grille patterns and options to match existing architecture. Match an existing color scheme or give exteriors a bold new look with one of six available colors.
Integrity Windows and Doors come in multiple color options
Integrity Windows and Doors voted Best in Quality by Builders

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

All Ultrex Windows and Doors
Constructed with Ultrex from the inside out, our All Ultrex offers outstanding strength and durability.
Integrity Windows and Doors - Ultrex Fiberglass

"If my clients ask my opinion, I always
recommend Integrity windows."

"The final product is a durable,
structurally sound, long-lasting
product that is better than anything
else in the industry."

"I used Integrity windows when I
replaced the windows in
my own home."

r.k. Miles

Established in 1940, r.k. Miles, Inc. has years of experience backed with unparalleled products and services, including Marvin and Integrity Windows and Doors. With six convenient locations in Vermont and Massachusetts, we are poised to serve our areas with timely deliveries and on-site consultation. No matter the scope of your next project, the r.k. Miles team of knowledgeable professionals will help you achieve success.

We look forward to working with you. 

Integrity Windows and Doors Remodel Replace Brochure
Marvin Windows and Doors Builder Guide
Manchester Center
(802) 362-1952
691 Depot Street
Manchester Center, VT 05255
(802) 388-2721
88 Exchange Street
Middlebury, VT 05753