Interior family room image featuring a Round Top Window and Casement Windows in Stone White interior finish with White hardware.

Marvin Replacement's Ultrex fiberglass is 3x stronger than Renewal by Andersen

The result: Ultrex's strength means you'll enjoy bigger views without bulkier frames getting in your way.

Start your project with a free, no-pressure in-home consultation.

Marvin Replacement's Ultrex fiberglass is 3x stronger than Renewal by Andersen

The result: Ultrex's strength means you'll enjoy bigger views without bulkier frames getting in your way.

Start your project with a free, no-pressure in-home consultation.

My Info

Project

Schedule

Confirmation

Ultrex fiberglass vs. Fibrex

What's the difference between Marvin Replacement and Renewal by Andersen?

Trying to decide between Marvin Replacement and Renewal by Andersen®? We invite you to compare their benefits to find the right option for your home.

Our Ultrex fiberglass is 8x stronger than vinyl and 3x stronger than Fibrex®—just one of the many benefits of Marvin Replacement.

*Renewal by Andersen® and Fibrex® are registered trademarks of Andersen Corporation.

Marvin Replacement vs. Renewal by Andersen

Material Comparison

See details

Material Strength

See details

Material Expansion

See details

Finish

See details

Product Warranty

See details

Installation Warranty

See details

Maintenance

See details

Company History

See details

PROVEN STRENGTH
FOR PEACE OF MIND

Compared to other materials, Ultrex fiberglass is the strongest window and patio door framing material in the replacement industry.

ULTREX IS 8X STRONGER THAN VINYL AND 3X STRONGER THAN FIBREX

We test the strength of Ultrex fiberglass so you don’t have to worry about your home. The results speak for themselves. Ultrex resists bending and flexing - that's confidence Fibrex and vinyl simply can't match.

3000

Ultrex

808

Wood/Vinyl Composite (Fibrex®)

385

Vinyl

1000

2000

3000

Flexural Modulus (KSI) — ASTM D790

The Marvin Replacement Difference

Black Marvin Replacement Sliding French door in a home dining room.

Replacing your windows and patio doors can be daunting, with many companies to choose, and dozens of choices to make. Here's what separates Marvin Replacement from the rest.

Speak with a design consultant, who can provide help in selecting the right windows and patio doors for your project.

Installation is an easy and hassle-free experience. Our dedicated team handles it all for you and makes sure you're satisfied.

Marvin Replacement products are all built using Ultrex fiberglass for long-lasting performance and timeless design.

All of our products are backed by our warranty for as long as you own your home.

TESTIMONIALS

“

Marvin Replacement has done a marvelous job from beginning to completion. The design consultant was very knowledgeable and helpful as he introduced the product and gave good explanation. During the waiting period, we received updates along the way, which is really nice and helpful to know the progress of the production. The installation as pretty smooth and quick. We're quite satisfied.

Victor Y.

Portland, OR

“

The whole process from start to finish was easy. The reps are very professional and friendly. The quality of the windows is very high and look beautiful. The installation was done carefully with minimal impact to my home. The experience exceeded my expectations.

Connie B

Lynnwood, WA

How it works

What You Can Expect

A design consultant working with a home owner

The Right Product for You

A Marvin Replacement expert will provide an in-home or virtual consultation to understand your specific project needs, then work to find the right style, colors, features budget for you.

Get Started

A man installation a Marvin Replacement window from the exterior of a home.

A Hassle-free Installation

On installation day, our team of Marvin Replacement Certified Installers will arrive at your home to remove your old windows and install your new ones.

Window + Door Installation

Woman drinking coffee on a wood deck featuring Marvin Replacement Polygon Windows.

Guaranteed Satisfaction

Marvin Replacement offers a Limited Lifetime Warranty for as long as you own your home—plus a five-year installation warranty.

Our Warranty

Get Started

Schedule your free consultation

White brick home exterior with a Marvin Replacement Bay window.

If you’re ready to get started, discuss your replacement window and door options with a Marvin Replacement design consultant. We’re here to answer any questions you may have, and help make your project easy.

Schedule Your Consultation

Installation

Our Installation Process