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Pella® Impervia® Fiberglass Double-Hung Window


Pella Impervia double-hung windows have two moveable sashes that provide ventilation throughout your home. Our low-maintenance fiberglass windows provide exceptional durability and can withstand some of the harshest conditions. With our durable powder-coat finish, your double-hung windows will look great for years — inside and out.

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Impervia Double-Hung 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

  • Energy-efficient options
  • Exclusive cam-action lock design for improved security and a stronger seal
  • Insulating foam available for increased energy efficiency

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

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Inside Pella Impervia

Made from our patented fiberglass material, Pella Impervia products are on average 100x more impact-resistant than a leading wood/plastic composite product.59 Our highly stable material won’t expand, warp or sag in the summer heat or shrink and turn brittle in harsh winter conditions.

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For the Pros

Pella Impervia Double-Hung Window Specs & Install Details

  • Timeless style and proven performance with unmatched strength and lasting durability
  • Handles the most extreme heat and cold16
  • Interlocking checkrail creates a barrier for air and water infiltration
  • Double-hung windows available in sizes up to 47-1/2” x 79-1/2”
  • Performance class and grade LC30-LC50
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Options for Pella Impervia Double-Hung 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.


For Pros

  • Pella Impervia windows are made from Pella's patented five-layer, engineered Duracast® fiberglass composite.
  • A fiberglass composite sharing the same properties of strength, durability and temperature resistance as materials used in the aerospace industry.
  • Allows Pella Impervia products to withstand extreme conditions better than windows made from other materials.
  • Highly stable material won't expand, warp or sag in summer heat, or shrink and turn brittle in harsh winter conditions.

Styling Your Window


Pella's cam-action locks are available in today's most popular finishes.


For Pros


These windows are available with a range of hardware finishes to meet most design objectives and budgetary requirements.

  • Block-and-tackle balances.
  • Surface-mounted sash locks.
  • Color-matched or optional finishes.

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

Between-the-glass Grilles

  • Interior is available in unfinished wood, primed, White or matched to prefinished stains.
  • Exterior finish matches aluminum cladding.
  • Grilles are 3/4" wide.
  • Special grille patterns are available.
cross section of dual-pane grilles between the glass

Dual-Pane 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

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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.

Learn more about Pella warranties

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