Why You Should Get Ultrex® Fiberglass for Your Windows

Dealing with a broken or flimsy window is no laughing matter. Make sure to switch to a more durable material before it’s too late.


One of the best window products on the market is Marvin®’s Ultrex® fiberglass. Timberland Exteriors™, a trusted provider of window and vinyl siding installation services, shares some of the advantages of this window material.

Ultrex Fiberglass

Ultrex fiberglass is a pultruded fiberglass material, which is considered stronger and more durable than other window materials. It’s a product of Marvin’s patented process that starts with the saturation of strong cables of glass with specially compounded resins.


With silica sand as base material, Ultrex fiberglass is eight times stronger than vinyl. Windows made with this fiberglass material are also known to last 38% longer than those made with vinyl. Ultrex fiberglass is definitely worth considering before pushing through with your vinyl window installation job.

Advantages of Ultrex Fiberglass

Here are more benefits that you’ll get from Ultrex fiberglass.

1. Better Views

With Ultrex fiberglass, you can enjoy more daylight and better views because it allows for a narrower window frame profile. This means you have more space for glass, giving you a wider view of the outdoors.

2. Superb Performance

Ultrex fiberglass effectively resists heat, cold, and pressure. Unlike vinyl, it won’t crack or become distorted under fluctuating temperatures. This fiberglass material has an extremely low thermal expansion rate ensuring the window is stable and weathertight.

3. Excellent Finish

Ultrex fiberglass features a patented, mechanically bonded finish that is three times thicker than average finishes. It has superior resistance to scratching, UV degradation and the harshest weather conditions.


Timberland Exteriors ensures professional and personalized services that cover window replacement, roofing, storm damage restoration and more. Call us at (651) 404-2330 or fill out our contact form to request a free, no-obligation quote. We serve customers in St. Paul, MN and the surrounding areas.

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