Ever heard of Fibrex® windows? If you’re looking to improve your home with new windows, you’re in for a treat. Crafted with advanced technology, these replacement windows from Renewal by Andersen® offer superior strength, impressive energy efficiency and a lifespan of more than 35 years.

Fibrex material is an exclusive Andersen composite crafted from 40% reclaimed wood fiber and 60% thermoplastic polymer. These materials are fused together in the manufacturing process, with the polymer surrounding and filling the wood fibers. This creates a strong, stable material that balances the beauty and durability of wood with the low-maintenance qualities of vinyl.
Fibrex is a unique composite framing made for exceptional strength and durability, allowing it to withstand harsh weather conditions and resist rot, decay and corrosion. The result is a window that lasts longer without losing shape or color.
Replacement windows with Fibrex frames significantly reduce heat transfer, keeping your home warm in the winter and cool in the summer. In conjunction with energy-efficient glass options, Fibrex windows can help further lower your energy bills and reduce your carbon footprint.
Fibrex windows are virtually maintenance-free, thanks to their resistant material. They do not require painting, staining or sealing, so you won’t need to worry about peeling or flaking paint. Additionally, their color is infused into the material during manufacturing, ensuring a long-lasting, consistent finish without fading.
Our high-quality replacement windows are available in various styles, including double-hung, casement, sliding, awning and specialty windows. They can also be custom-designed to fit uniquely shaped and sized openings, and with several color options, you can choose the one that perfectly complements your home’s exterior and interior design.
Fibrex is made of recycled wood fibers, reducing the need for logging virgin forests. In addition, the manufacturing process of Fibrex windows is energy-efficient, producing less waste and fewer greenhouse gas emissions than traditional window materials such as vinyl and aluminum.
We at Renewal by Andersen stand behind our products, which is why our replacement windows are backed by fantastic warranties. This includes a limited warranty on the material and a multi-year warranty on labor and installation, giving you added peace of mind for your investment.
Renewal by Andersen follows a complete window replacement process, starting with an in-home consultation. Your design consultant will closely examine your existing windows, take measurements and help you select styles, glass, colors, grilles and hardware. Each window is then custom-manufactured for its exact opening.
On installation day, your trained installers remove your old windows, prepare the openings and install your new units. They thoroughly clean the work area and complete a final walk-through with you, answering any questions along the way.
Current Acclaim® replacement window coverage includes 20-year limited warranties on glass and Fibrex components, 10 years on locks, hinges and other non-glass components and two years on professional installation.
Full Fibrex window costs can vary widely, depending on size, style, glass choices and installation conditions. To estimate your ROI, compare the complete project price with potential energy savings, lower maintenance costs and increased resale value. Keep your pre-installation utility bills, project documents and maintenance records so you can track your savings accurately.
Fibrex windows are trusted to resist rot, corrosion and seasonal temperature changes without routine painting or staining. They can also fit your priorities if you’re looking for energy-efficient frames, custom styles or professional installation handled by one team.
When comparing materials, don’t forget to look beyond the frame. Glass performance, weatherstripping, hardware, installation quality and warranty coverage are all crucial considerations.
Fibrex windows typically have a higher upfront price than basic vinyl windows. Fibrex material is also exclusive to Andersen, so you can’t compare the same material across other brands.
There isn’t a standard price; each Renewal by Andersen window is custom-made. Size, style, glass, finish selections and installation conditions all shape the final quote.
Fibrex material is designed to perform for decades. Actual window lifespan comes down to climate, installation, use and care. Warranty coverage should not be seen as a guaranteed lifespan.
We hope the discussion about Fibrex’s benefits are enough for you to consider them for your window replacement project. For more information, give Renewal by Andersen a call at (206) 775-7533. You may also fill out our contact form to schedule a consultation.