Pella Impervia Casement Windows combine durability with crank-open operation for ventilation, energy efficiency, and a sleek, modern fiberglass design.

Key Features

• Built with virtually maintenance-free fiberglass frames on the interior and exterior.
• Commercial grade strength and performance.
• Patented lock system engages multiple locks, with one easy-to-use lock-lever for extra security.
• Secondary secure vent lock for added protection
• Will handle the most extreme heat and cold.
• Both top and bottom sashes tilt in for easy cleaning from inside the home.
• Energy Star Rated

Side by Side Comparison

Pella Impervia Series Fiberglass Windows vs. Andersen 100 Series Fibrex Windows vs. Infinity from Marvin Series Fiberglass Windows: An Informed Comparison for Homeowners.

Choosing new windows is an important decision, and with options like Pella Impervia Series, Andersen 100 Series, and Infinity from Marvin, you have some excellent choices in the durable materials category. While each product offers distinct benefits, this comparison will highlight key aspects such as materials, customization, warranties, cost, and more to help you make the best choice for your home. Pella Impervia Series provides a well-balanced combination of durability, customization, and long-term value that may make it a top contender, but let’s take a look at how each window performs across the board.

Let's see how Pella's exclusive fiberglass material stacks up against the competition. By the numbers, Pella outperforms Andersen Fibrex and Marvin to hold up for superior strength and durability for your home.

Won't Bend Pella fiberglass is on average stronger than Andersen Fibrex in a bend test

Won't Dent Pella fiberglass is on average more impact resistant than Marvin Fiberglass

Won't Break Pella fiberglass is on average the tensile strength of Andersen Fibrex material

Materials

Pella Impervia Series: The Impervia Series is made from Duracast fiberglass, a proprietary fiberglass composite that’s incredibly strong and durable. Fiberglass expands and contracts very little with temperature changes, which helps maintain the window’s structural integrity over time. This makes it ideal for extreme climates.

Andersen 100 Series: Andersen’s 100 Series windows are made from Fibrex®, a blend of wood fiber and thermoplastic polymer. Fibrex offers solid durability and energy efficiency, but it may not be as robust as full fiberglass in terms of structural strength and thermal expansion resistance.

Infinity from Marvin Series: Marvin’s Infinity windows are constructed from Ultrex® fiberglass, a highly durable material similar to Pella’s Duracast. Fiberglass windows, like those from Marvin, are known for their ability to withstand extreme temperatures and are less likely to warp or crack compared to Fibrex or vinyl.

Pella Impervia - 100% Fiberglass. 0% Wood Fiber.

Marvin Ultrex, manufactured from a basic fiberglass material	Andersen Fibrex, made of plastic, wood fiber and glue
Marvin’s Essential Collection windows and doors use randomly blown fiberglass rovings combined with resin and heated until the materials fuse together. However, the randomness of these fibers means they lack the consistent strength provided by Pella’s Impervia fiberglass, which uses a precisely engineered structural mat to maximize durability and performance.	Contrary to popular belief, Andersen Fibrex isn’t fiberglass. It’s made of 40% wood fibers and 60% plastic, fused together with glue to form the frame. Lacking strong fiberglass rovings and mats, the thermoplastic material in Andersen 100 Series and Renewal by Andersen Fibrex products may be more vulnerable to breaking and shattering than fiberglass alternatives.

Pella Impervia - Built for Superior Strength

Pella's fiberglass starts with a structural mat that places rovings in a specific, intricate order to meet Pella's high standards. The mat and additional rovings are injected with polymer resin and heated to create an entirely new, thermoset material. Pella's fiberglass material is the strongest available for windows and patio doors.

Let's Compare the Details

Warranties

Pella Impervia Series: Pella backs its Impervia Series with a limited lifetime warranty, offering excellent long-term coverage for both materials and glass. This comprehensive warranty ensures peace of mind, especially with the well-established durability of Pella’s fiberglass.

Andersen 100 Series: Andersen provides a 20-year warranty on glass and a 10-year warranty on non-glass components for the 100 Series. While solid, it doesn’t match the length or comprehensiveness of Pella’s lifetime warranty.

Infinity from Marvin Series: Marvin offers a 20-year warranty on glass and a 10-year warranty on the rest of the window. This is comparable to Andersen’s offering but falls short of Pella’s more extensive coverage.

Energy Efficiency

Pella Impervia Series: Pella’s Impervia windows are Energy Star certified and offer highly efficient glass packages, including triple-pane options that significantly improve insulation and reduce energy costs. The overall design of these windows focuses on maximizing thermal efficiency, particularly in harsh climates.

Andersen 100 Series: Andersen 100 Series windows are also Energy Star certified, with Fibrex providing solid insulation. However, the absence of triple-pane glass as a standard option may make them slightly less energy-efficient compared to the Pella Impervia Series.

Infinity from Marvin Series: Marvin Infinity windows are Energy Star rated and provide a wide range of energy-efficient glass options. The inherent properties of fiberglass, combined with Marvin’s advanced glass technology, ensure excellent thermal performance across various climates.

Final Thoughts

Each of these three window series—Pella Impervia, Andersen 100, and Marvin Infinity—offers unique benefits. Pella Impervia Series stands out as a well-rounded option, combining durability, customization, energy efficiency, and competitive pricing. For homeowners looking for long-term reliability, minimal maintenance, and great performance in a variety of climates, Pella Impervia is an excellent choice. While Andersen 100 Series is more budget-friendly and Marvin Infinity offers high-end fiberglass performance, Pella Impervia strikes a perfect balance between performance, cost, and customization that makes it a strong contender for homeowners seeking the best value in fiberglass windows.