Integrity Advantages

Integrity Windows and Doors sets you up for success with a wide selection of products and options, fast, dependable delivery and a dedicated customer support system. As pioneers of the fiberglass window and door category Integrity is revolutionizing the industry. At the heart of it all is Ultrex, our proprietary pultruded fiberglass construction material.

Lou Manfredini is a television/radio personality and home improvement expert. He is the host of House Smarts TV and Chicago’s WGN (AM) Radio’s Mr. Fix-It program and is a frequent contributor on NBC’s Today Show.


When you want the best windows, start with the best materials. Ultrex pultruded fiberglass outperforms vinyl and aluminum on every measure:

Ultrex logo and windows
  • 8x stronger than vinyl
  • 4x stronger than composites
  • 9x less expansion and contraction than vinyl
  • Non-conductive and non-corrosive
  • Patented finishing process resists fading and cracking

For great-looking windows and doors that are strong, durable, and maintenance free, there’s Ultrex and there’s everything else. Integrity is proud to be the world’s largest manufacturer of Ultrex windows and doors.



You can count on Ultrex and you can count on the company that makes it. Integrity works closely with architects, contractors and installers to ensure your project goes smoothly from planning to installation and beyond.

10 Day
  • Guaranteed 10-day delivery
  • 10-year product warranty/20-year glass seal warranty
  • Complete lineup of product accessories
  • Trained support staff and retailers
  • Special sizes
  • Short lead times

Online Support

Everything you need to spec and install Integrity windows and doors can be found right here at

  • Complete sizing and specifications
  • NFRC Values
  • STC Ratings
  • Egress Data
  • Altitude Guidelines
  • Design Pressure Certifications
  • Architectural Detail Manuals
  • Installation Instructions
  • Marvin Design System

Use the Resource Library for instant access to our complete resource library for the specific Integrity product you are looking for.

Product Lineup

Integrity windows and doors are available in three different series to meet the varying needs of our customers:

Photo of kitchen window
  • All Ultrex Series – Ultrex interior and exterior for unmatched strength and durability
  • Wood-Ultrex Series – Ultrex exterior and a wood interior you can stain to match your décor
  • IMPACT Products – Ultrex windows Impact Zone 3 rated for coastal applications

When you demand style and performance, you can count on Integrity.