PELLA® IMPERVIA® Fiberglass Windows


Pella’s fiberglass windows are made of the strongest, most durable material available in windows.17 Our patented, low-maintenance fiberglass is scratch-resistant and can withstand extreme heat and subzero cold temperatures, so you can trust our fiberglass windows to perform in your home.

Pella® Impervia® fiberglass windows offer superior strength and durability. Enjoy the enduring beauty of fiberglass awning, casement, sliding, single-hung and double-hung windows — backed by one of the strongest warranties in the business

Caement Windows

Double-Hung Windows

Single-Hung Windows

Sliding Windows

Awning Windows

Why Fiberglass?

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

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


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. Tested from -40ºF to 180ºF, these windows can withstand some of the harshest conditions, making them strong and incredibly energy efficient.