Schedule a Free Consultation

Fibrex®: A Revolutionary Composite for Lasting Weatherproof Windows

Fibrex weatherproof windows

While wood, vinyl and aluminum windows have a tendency to warp and crack, Renewal by Andersen’s exclusive Fibrex® composite material is made from reclaimed wood fiber blended with a polymer for lasting weatherproof windows. Fibrex® is warranted not to flake, rust, blister, peel, crack, pit or corrode even after 20 years*. This frame material combines the strength and insulation of wood with the low maintenance feature of vinyl to create a superior product.

Unlike other window companies that don’t practice responsible stewardship, Renewal by Andersen products are created through a sustainable, ecofriendly process that leaves minimal impact on the environment. In fact, thanks in large part to Fibrex® material, Renewal by Andersen and its parent company Andersen Corporation are one of the first window manufacturers in the world to be Green Seal Certified.

So What Is Fibrex® Material?

  • A blend of 40 percent wood fiber by weight, mostly reclaimed from Andersen manufacturing processes, with 60 percent thermoplastic polymer by weight, some of which is also reclaimed.
  • Blocks thermal transfer nearly 700 times better than aluminum to help reduce heating and cooling bills.
  • Reduces VOC emissions because no wood preservative treatments or painting is required.
  • Twice as strong as vinyl, so weathertight seals stay weathertight.
  • Retains its stability and rigidity in all climates.
  • A unique fabrication process blends the color with the Fibrex® material during production for long-lasting beauty.
  • Resists rot, decay and fungal growth, and won’t flake, blister, peel, pit or corrode*

*See limited warranty for details.


"They arrived with a large crew to install 10 windows, and finished the job on time. Work was clean and neat. Installers were polite and efficient. They covered the work areas and cleaned up afterwards. We are pleased with the result."

Ron M.

View All Reviews