Fibrex® Composite Windows and Doors are Strong, Beautiful & Built to Last
Exclusive to Renewal by Andersen®, Fibrex® composite material combines the strength of wood with the low-maintenance benefits of vinyl — creating a window that outperforms every other option on the market.
For over 30 years, Andersen Corporation has led the way in window innovation, and Fibrex® is the patented result: a high-performance material designed to look better, last longer, and deliver unmatched efficiency.
Why Choose Fibrex® Windows?
When it comes to replacement windows, the material matters. Fibrex® frames and sashes are engineered to outperform vinyl, wood, aluminum, and fiberglass in every key category:
Strength & Durability
- Twice as strong as vinyl, Fibrex® allows for narrower frames and more glass area — meaning bigger views and more natural light.
- Resistant to cracking, rotting, warping, or corrosion, no matter the climate.
Energy Efficiency
- Fibrex® has superior insulating properties, helping keep your home warmer in winter and cooler in summer.
- Paired with Andersen® High-Performance™ Low-E4® glass, Fibrex® windows meet ENERGY STAR® standards and can lower your energy bills.
Low Maintenance
- Unlike wood, Fibrex® never requires painting, scraping, or chemical treatments.
- It won’t flake, peel, blister, or fade — giving you peace of mind and lasting beauty.
Custom Style & Beauty
- Available in 27 custom colors, including darker shades vinyl can’t handle.
- Fibrex® can be molded into specialty shapes — even elegant curves — preserving your home’s architectural charm.
Environmentally Responsible
- Made with 40% reclaimed wood fiber by weight, Fibrex® is an eco-friendly choice.
- Renewal by Andersen® has been recognized as an ENERGY STAR® Partner of the Year for leadership in sustainability.
What is Fibrex®?
Watch this video to learn more about the exclusive composite material used in our windows and doors.
Fibrex® vs. Other Window Materials
Backed by One of the Best Warranties in the Industry
Your windows are more than just glass and frames — they’re a system of materials and expert installation. That’s why Renewal by Andersen backs Fibrex® windows with a strong limited warranty for long-term protection and peace of mind.
Learn more about Fibrex® material from John Colaneri
Designer and TV personality, John Colaneri goes behind the scenes to Renewal by Andersen’s Fibrex® Material manufacturing facility to learn more about the revolutionary material, see how it’s made and tested.
Discover the Fibrex® Difference
Fibrex® isn’t just a window material — it’s a game-changing solution that blends lasting performance, timeless style, and environmental responsibility.
Ready to upgrade your home with Fibrex® composite windows? Schedule your free consultation today with Renewal by Andersen® and see why homeowners choose Fibrex® over vinyl, wood, or fiberglass.