Pella® Impervia® Casement Windows

Specifications & Downloads
2D Cross Section
(Fiberglass)
2D Elevation
(Fiberglass)
3D BIM
(Fiberglass)
Specifications
(Fiberglass)
  • Made with Pella's patented Duracast® fiberglass composite material
  • Operable sizes up to 3' 1-1/2" x 6' 7-1/2"
  • Performance Grade up to PG50
  • Limited opening and egress hardware available
Installation Guides Warranty Info

A local Pella team member is ready to help you with your project.

Features & Options

Sizes and Shapes Pella Impervia Casement Window

Shapes

  • Rectangle


View all Pella Sizes and Shapes.

Performance Values Pella Impervia Casement Window

These windows provide outstanding resistance to air and water infiltration, wind and outside noise while increasing energy efficiency, security and ease of operation.

Optional Foam Insulation

  • Insulating foam inside the sash further improves energy efficiency.

NOTE: Optional foam insulation represented by shaded area.

Material Pella Impervia Casement Window

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.

Duracast Conventional Fiberglass Aluminum with Thermal Break Nonreinforced Vinyl

Material Comparison

Strength Excellent Very Good Very Good Fair
Nine times stronger than vinyl and twice as strong as aluminum.*
Hot/Cold Performance Excellent
Withstands heat up to 200° F and cold down to -40° F.
Excellent Excellent Fair
Thermal Expansion Excellent
Low expansion and contraction rate assures consistent, weathertight seal between sash and frame.
Excellent Fair Fair
Impact Resistance Excellent
Withstands impacts without deformation.
Good Good Fair

*In testing performed in accordance with ASTM testing standards, Pella's Duracast fiberglass composite has displayed superior performance in strength, ability to withstand extreme heat and cold, and resistance to dents and scratches.

Energy Efficiency

  • Unlike aluminum, which is a natural conductor, Duracast fiberglass composite offers excellent insulating properties and exceptional energy efficiency.
  • The U-Factor of the Duracast fiberglass composite frame is 2.4 times better than thermally broken aluminum.
  • When compared to thermally broken aluminum, Duracast fiberglass composite offers greater resistance to condensation and superior thermal comfort to those seated near windows.

Thermal Expansion

  • Unlike vinyl or aluminum, Duracast fiberglass composite offers low expansion and contraction rates that help ensure a consistent bond between sash and glass and a weathertight fit between sash and frame.
  • Duracast fiberglass composite withstands extreme heat (up to 200° F) without warping, sagging or softening even in dark colors.
  • Duracast fiberglass composite withstands extreme cold (as low as -40° F), unlike vinyl, which can become brittle in extreme cold.

Impact Resistance

  • Duracast fiberglass composite withstands major impacts without deformation, especially in cold weather.

Durable Finish

  • Duracast fiberglass composite features a low-maintenance, factory-applied powder-coat finish that resists chalking and fading even in dark colors.

View all Pella Materials.

Interior Finishes Pella Impervia Casement Window


Pella Impervia casement windows feature a low-maintenance, factory-applied powder-coat paint finish in White, Tan, Morning Sky Gray, Brown or Black.

  • White

  • Tan

  • Morning Sky Gray

  • Brown

  • Black


Learn more about all Pella's Interior Finishes.

Exterior Finishes Pella Impervia Casement Window

Pella Impervia casement windows feature a low-maintenance, factory-applied powder-coat paint finish.

  • Resists chalking and fading even in dark colors.
  • Available in White, Tan, Morning Sky Gray, Brown or Black. And Pella's dual-color option provides more style and design flexibility the products offer a White interior with the choice of a Tan, Morning Sky Gray, Brown or Black exterior.

  • White

  • Tan

  • Morning Sky Gray

  • Brown

  • Black


Learn more about all Pella Exterior Finishes

Glazing Pella Impervia Casement Window

Pella Impervia casement windows are available with a variety of insulating glass options for optimal design, performance and budget flexibility.

Insulating glass options include:

  • Advanced Low-E with argon*
  • SunDefense Low-E with argon*
  • NaturalSun Low-E with argon*
  • Clear
  • Obscure
  • Tempered

Pella's Low-E glass options reduce the transmission of solar heat gain and ultraviolet light while allowing the transmission of visible light.


View thermal performance for this unit.

*Optional high-altitude Low-E insulating glass does not contain argon in most products.


Learn more about all Pella Glass Options.

Grilles Pella Impervia Casement Window

Pella Impervia casement windows are available with grilles-between-the-glass that match the frame color and include a variety of grille patterns.

Between-the-glass grilles

Permanent aluminum grilles are factory-installed between the panes of glass.

  • Color matches frame.
  • Multiple grille patterns available.
  • West Region includes 5/8" Flat grille and 3/4" Contour grille
  • East Region includes 3/4" and 1 " Contour grilles

Grille Profiles

Grille Patterns

  • Traditional

  • 9-Lite Prairie

  • Top Row

  • Custom-Equally Divided

Learn more about Pella Impervia Casement Grille Profiles, Patterns, Spacing and Visible Glass Design Parameters.

Learn more about all Pella Grille Options.

Hardware Pella Impervia Casement Window

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

  • Integrated crank with fold-away handle.
  • Patented Unison Locking System.
  • Stainless-steel operating arms and hinges.
  • Optional limited opening and egress hardware.
  • Color-matched or optional finishes.

Integrated Crank with Fold-Away Handle

Improves operation and aesthetics and won't interfere with roomside window treatments standard feature on all Pella casement windows.

  • Standard lock hardware is finished in White, Tan, Morning Sky Gray, Brown or Black to match the window color.
  • Additional color options: Bright Brass, Satin Nickel and Oil-Rubbed Bronze.

SureLock® Unison Lock System

This patented locking system reaches out to lift and pull the sash against the weatherstripping to form a tight seal. A concealed linkage secures both upper and lower locks with a single easy-to-reach handle.

  • One lock installed on units 27-1/2" and smaller frame height.
  • Two unison operating locks installed on units over 27-1/2" frame height.

Roto-Operator Assembly

Stainless-steel operator linkage, hinge slide and hinge arms resist rust and corrosion and ensure years of dependable performance.

Easy Wash

With the easy-wash feature, the sash moves toward the center of the frame, allowing exterior glass to be cleaned from inside, reducing maintenance costs.


Learn more about all Pella Hardware Options.

Screens Pella Impervia Casement Window1

Full screens with conventional fiberglass screen cloth are optional for Pella Impervia casement windows. InView high-transparency screen fabric is available as an option.

InView Screen

Available as an optional upgrade on Pella Impervia windows.

  • Allows in 14% more daylight and 8% more airflow than a conventional fiberglass screen.2
  • Made from a screen material that's more transparent than conventional fiberglass screens.

1Warning: Use caution when children or pets are around open windows and doors. Screens are not designed to retain children or pets.

Screen cloth airflow is based on calculated screen cloth openness. Screen cloth transmittance was measured using an integrated sphere spectrophotometer. is disclaimer text.


Learn more about all Pella Screen Options.

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