Fiberglass Windows

Made from patented Duracast® fiberglass composite, Pella® Impervia® fiberglass windows are a cost-effective, low-maintenance alternative to wood replacement windows. They protect from warping in the hotter days and defend against winter weather, and are available in a variety of color options to complement your home.

At Pella of Casper, we have learned that Pella Impervia windows are a fitting choice for homeowners who want the impressive look of a painted wood window with the superior reliability and excellent energy efficiency that come with a fiberglass window. Backed by our industry-leading warranty, Pella Impervia replacement windows require almost no maintenance, offering striking beauty and performance for years to come.

Pella® Impervia® Series

  • Constructed from Duracast®—the strongest, most durable material you can have in windows
  • Excellent performance
  • The quality look of a painted wood window
  • ENERGY STAR®-rated options help conserve energy
Available Styles
  • Awning
  • Casement
  • Double-Hung
  • Single-Hung
  • Sliding
  • Basement
  • Bay and Bow

Discover fiberglass windows at your nearby Pella showroom or click below to plan a free, in-home consultation and discover the windows that are right for your budget.