Fiberglass Windows

Created from patented Duracast® fiberglass composite, Pella® Impervia® fiberglass windows are a cost-friendly, low-maintenance alternative to wood replacement windows. They resist warping in the hotter days and defend against winter weather, and are available in a selection of color types to accompany your home.

At Pella of Des Moines, we have discovered that Pella Impervia windows are the right choice for homeowners who want the impressive look of a painted wood window with the top-notch dependability and impressive energy efficiency that are a part of a fiberglass window. Backed by our industry-leading warranty, Pella Impervia replacement windows need almost no maintenance, resulting in exceptional beauty and performance year after year.

Pella® Impervia® Series

  • Made from Duracast®—the strongest, most durable material available in windows
  • Exceptional performance
  • The high-end look of a painted wood window
  • ENERGY STAR®-rated options conserve energy
Available Styles
  • Awning
  • Casement
  • Double-Hung
  • Single-Hung
  • Sliding
  • Basement
  • Bay and Bow

Look into fiberglass windows at your local Pella showroom or click below to schedule a free, in-home consultation and discover the windows that meet the needs of your home.



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