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Pella® Impervia® Fiberglass

Incredibly strong fiberglass.

  • Superior durability in extreme weather conditions.1
  • Incredibly strong, stable fiberglass windows and patio doors.
  • The quality look of a painted window.
  • Exceptional energy efficiency.

Download Features and Options

Available Pella Impervia
Window and Patio Door Styles

Awning Window Awning Window
Casement Window Casement Window
Double-Hung Window Double-Hung Window
Single-Hung Window Single-Hung Window
Sliding Window Sliding Window
Sliding Patio Door Sliding Patio Door

Why Choose Pella Impervia

Pella windows vs the competitor's windows comparison

The Beauty and Style of Fiberglass

  • Beautifully compliments your home with the quality look of a painted window.
  • Arrives prefinished with a durable, low-maintenance powder-coat paint finish in White, Tan, Morning Sky Gray, Brown or Black.
  • Dual-color frame option available with a White interior and a Tan, Morning Sky Gray, Brown or Black exterior.
  • Optional InViewTM high-transparency screens2 let in 14% more light and are 8% more open to increase airflow than conventional fiberglass screens.3

 Distinctive fine furniture detailing

Unsurpassed Strength and Durability

  • Pella's five-layer Duracast® fiberglass composite is highly stable and suitable for all climates.
  • Durable, patented fiberglass composite can withstand extreme heat to subzero cold.
  • They won't warp in the heat or become brittle in the cold.

energy efficiency

Exceptional Energy Efficiency

  • Pella Impervia products offer the energy-efficient options that will meet or exceed ENERGY STAR® certification in all 50 states.
  • Optional foam–insulated frames further improve energy efficiency.
  • Enjoy a more comfortable home year round.


20/10 Limited WarrantyEnjoy satisfaction for years to come. 

Pella® fiberglass windows and patio doors are backed by the Pella Limited Lifetime Warranty — one of the best warranties in the business. See written warranty for complete details.

Literature and Downloads


Pella literature

Pella Brochure

Size Charts

Pella sizing charts

Awning Window

Casement Window

Double-Hung Window

Single-Hung Window

Sliding Window

Sliding Patio Door


Pella resources

How to Measure

1 In testing performed in accordance with ASTM testing standards, Pella's Duracast fiberglass composite material has displayed superior performance in strength, ability to withstand extreme heat and cold, and resistance to dents and scratches.

2 WARNING: Screen will not stop child or pet from falling out of window. Keep child or pet away from open window.

3 Screen cloth airflow is based on calculated screen cloth openness. Screen cloth transmittance was measured using an integrated sphere spectrophotometer.

Wondering where to start? We’ll guide you through the process.   Contact Us
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