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Pella® Impervia® Fiberglass Casement Window


Pella Impervia casement windows open and close with the turn of a crank. Create sleek designs featuring slim profiles and more visible glass with our exceptionally strong fiberglass. And with a durable powder-coat finish, Pella Impervia casement windows deliver a timeless, long-lasting look.

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Impervia Casement Window Features

Why Fiberglass?

  • Superior strength and durability with patented fiberglass material16
  • Withstands the most extreme temperatures
  • Long-lasting powder-coat finish, including Black
  • Sleek, slim profiles
  • Meets the rigorous performance requirements of a commercial building43

Performance Enhancements

  • Optional foam insulation for better energy performance
  • Exceptional energy efficiency
  • Innovative locking system for improved security and a stronger seal
  • Patented unison locking system, with one easy-to-use lock-lever

50% off qualifying installations1,3or0% APR for 48 months2,3

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Inside Pella Impervia

Made from our patented five-layer fiberglass material, Pella Impervia windows are on average 100x more impact-resistant than a leading wood/plastic composite product.59 Tested from -40ºF to 180ºF, these windows can withstand some of the harshest conditions, making them strong and incredibly energy efficient.16

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For the Pros

Pella Impervia Casement Window Installation and Product Specs

We've collected all the information building professionals need to know to save time on Pella Impervia installations. Find all of the information you will need to install a Pella Impervia casement window.

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Options for Pella Impervia Casement Windows

Choosing Your Window


Make a design statement with window combinations. Additional combinations are available. See your Pella sales representative for the complete offering.

Interior Finishes

Pella Impervia fiberglass products have a long-lasting factory powder-coat finish in your choice of five colors plus dual-color frame options. Learn more about interior finishes.

white enduraclad paint window corner


Styling Your Window


Pella's fold-away crank is available in today's most popular finishes.

white fold away crank for impervia windows


Grille Patterns

Grilles give the appearance of individual window panes. Pella offers many grille patterns to help enhance your home's architectural style.



Grille Profiles

Grilles-between-the-glass create the classic look of individual windowpanes. Learn more about grille profiles.

3/4" grilles between-the-glass

3/4" Grilles-Between-the-Glass

Window Enhancements

Integrated Security Sensors

Stay connected to your windows.

Preserve beauty, add comfort and enhance home security with innovative Pella Insynctive® technology.

Protect what matters most. Monitor windows while at home or away with the Pella Insynctive App.40

insynctive app in hand with status


Conventional Fiberglass Screens

Pella's high-transparency screens are made of a finer screen fabric than conventional screens for a clear view that allows more air and natural light to flow into your home.

Pella InView™ screens let in 14% more light and are 8% more open for improved airflow compared to conventional fiberglass screens.5

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Pella products are backed by some of the strongest warranties in the business.

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