Schedule a FreeConsultation

Why Is Fibrex® Material So Strong and Energy-Efficient?

Of all window framing options, Renewal by Andersen® of Austin’s Fibrex material® is the closest to perfection. In terms of durability and energy efficiency, its unique characteristics are unmatched. Here’s what makes it tough and energy-saving:

Incredible Strength

Our Fibrex material is twice as stable and rigid as vinyl. Consisting of 40 percent reclaimed wood fibers by weight, its stiffness is on par with authentic lumber. Because of that, our windows can maintain their weathertight seal for decades, preventing air leakage effectively.

In contrast, vinyl units usually crack or bow over time because they expand and contract with extreme temperature swings. Their inability to remain intact is a common cause of glass seal failure. This structural flaw is the reason why vinyl products are less effective thermal barriers.

Unfailing Decay Resistance

Our patented, composite material allows our bay, bow, double-hung and sliding windows to naturally repel moisture and resist rot and fungal growth. Using our innovative extrusion process to make Fibrex material, our proprietary polymer fills and encases each individual cell of the wood fiber.

As a result, Fibrex’s structural integrity will remain intact under normal conditions with practically no maintenance. Guaranteed not to blister, flake, peel or pit, Fibrex eliminates the need for period scraping or painting.

Exceptional Insulating Quality

Our advanced glazing system is behind the excellent energy performance ratings of our casement, picture and custom windows. However, our Fibrex material is likewise a major contributor to the insulating value of our units. To put things into perspective, it reduces heat transfer nearly 700 times better than aluminum.

Come see an actual Fibrex material sample in person to further appreciate its unrivaled durability and energy efficiency. Call Renewal by Andersen of Austin at (866) 842-3370 now to schedule your FREE, in-home consultation at your convenience. We serve Georgetown, TX, and the surrounding communities.


"Renewal by Andersen delivered a superior product with superior customer service, the best construction, experience and all promises completed professionally and in a timely manner. All my windows were replaced in one day"

View All Reviews