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Pella® Impervia® Fiberglass Sliding Window


Engineered to last, Pella Impervia sliding windows glide open and closed horizontally for easy operation.61 Featuring an up-to-date color palette, including Black, we offer interior and exterior color options to achieve your unique style. They provide outstanding resistance to water, wind and outside noises — while delivering energy efficiency, security and ease of operation.

Impervia Sliding Window Features

Why Fiberglass?

  • Superior strength with our proprietary fiberglass material61
  • Rot- and corrosion-free
  • Tested for the extremes and suitable for all climates
  • Heavy-duty powder-coat finish, including Black


  • Resist air and water infiltration with an interlocking checkrail and weep system
  • Designed with a double-roller system for smooth, long-lasting operation
  • Corner locks, metal fasteners and injected sealant for added strength, durability and reliable water performance
  • Sleek profiles and more glass allow for bold, modern designs in an up-to-date color palette, including Black

Pella Impervia

Get windows ready to handle virtually anything life throws at them. Pella Impervia products are made from our proprietary fiberglass, the strongest material for windows.61

Pella’s exclusive fiberglass will never rot or corrode and resists dents, bends and breaks — and the list goes on. With a tough-as-nails powder-coat finish, your windows will never need to be painted or refinished.

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Inside Pella Fiberglass

Pella Impervia windows are created from our exclusive fiberglass formula. A structural mat places rovings in a specific, intricate order to meet our high strength standards. Additional layers of strategically placed rovings are added, then the materials are pulled through a machine, injected with polymer resin and heated. It creates an entirely new, thermoset material which won't break down when exposed to the elements or lose its shape in extreme heat — unlike other materials.

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cutaway of impervia products

The Pella Difference

We do more than just create windows and doors. We test beyond industry requirements and innovate continuously to make beautifully designed products that you can be proud to own.

For the Pros

Pella Impervia Sliding Window Specs & Install Details

  • Made from the strongest material for windows, our proprietary fiberglass material61
  • Tested from -40ºF to 180ºF
  • Two- and three-panel options with equal vent, 1/3 and 1/4 vent
  • Two-panel sliding windows available in sizes up to 71-1/2” x 71-1/2”
  • Three-panel sliding windows available in sizes up to 107-1/2” x 71-1/2”
  • Performance class and grade LC30-LC50
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Options for Pella Impervia Sliding Windows

Choosing Your Window


Make a design statement with window combinations. Additional combinations are available. See your Pella sales representative for the complete offering.

For Pros

Combination Design Considerations
  • Save time on your remodel of new construction project with factory-mulled combinations.
  • Combination assembly options include integral mullion, tight mullion, 1/2” structural mullion or 1” structural mullion with additional steel reinforcements available.
  • Designed and tested to ASTM E330 for structural test pressures up to 75PSF (DP50).

Frame Finishes

Pella Impervia fiberglass products have a long-lasting factory powder-coat finish in your choice of three colors. Learn more about finishes.


For Pros

  • Pella Impervia products are made from our proprietary fiberglass material, the strongest material for windows, engineered for lasting durability.61
  • Our long-lasting powder-coat finish meets AAMA 624, which is a highly-rated fiberglass coating.
  • Exclusive thermoset 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 options and finishes to meet most design objectives and budgetary requirements.

  • Surface-mounted sash locks.
  • Color-matched or optional finishes.
  • Nylon roller housings and metal rollers.

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

Window Enhancements


Flat Screens

Conventional fiberglass screens come standard.

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