Brought to you by Jacob Windows – Your Trusted Marvin Dealer
When it comes to replacement windows, not all composites are created equal. At Jacob Windows, we proudly install Marvin Fiberglass Windows because we believe in offering our customers the best – not just the best-looking, but the best-performing, too.
So let’s settle the big debate: Marvin’s Ultrex® Fiberglass vs. Andersen’s Fibrex®. Which one should you trust in your home? Let’s break it down.
What Is Marvin Ultrex®?
Marvin’s Ultrex® fiberglass is a pultruded fiberglass composite – and it’s the real deal. It’s made from pure fiberglass, pulled through a resin and heated into an ultra-durable, high-performance frame. Simply put: this stuff is strong.
- 8x stronger than vinyl
- Low thermal expansion – keeps its seal in heat and cold
- Virtually maintenance-free
- Exceptional long-term performance in all climates
What About Andersen Fibrex®?
Andersen’s Fibrex® is a wood fiber + thermoplastic polymer blend. While it’s marketed as an innovative composite, it still contains organic materials (wood), which may expand, contract, and degrade over time depending on weather conditions.
- More expansion in temperature swings
- Less rigid under stress
- Still a great product – just not as stable as pure fiberglass
Why Marvin Ultrex® Wins in the Real World
We’ve seen it firsthand in homes across St. Louis and Southern Illinois: Marvin’s fiberglass windows outperform Fibrex® year after year. They handle the intense heat, cold, humidity, and storm cycles without warping, cracking, or fading.
- In brutal summers? They hold up.
- In icy Midwest winters? They don’t flinch.
- Looking great for 20+ years? They still do.
Installed By Pros, Backed By Jacob Windows
Choosing Marvin Windows means you’re not just choosing a product—you’re choosing our promise:
- Certified installation teams
- Local service and support
- Warrantied craftsmanship
- Real people who care
Ready to Upgrade Your Home?
If you’re considering Andersen Fibrex® or vinyl windows, talk to us first. We’ll show you why more homeowners are going with Marvin Fiberglass Windows – and how we make the process simple, fast, and affordable.
📞 Call 800-222-6676 or request a free consultation online today!
Jacob Windows – Built to Last. Installed with Care.
