Pella® Impervia® Fiberglass Sliding Window

Pella® Impervia® Fiberglass Sliding Window

4.27

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455 Reviews

Pella Impervia fiberglass sliding windows provide outstanding resistance to water, wind and outside noises – while delivering energy efficiency, security and ease of operation. Made from our proprietary fiberglass material, the strongest material for windows, sliding windows glide open and closed along a track.16

  • Unique weep system on frame provides exceptional water management.
  • Exterior screen allows for easy ventilation with optional InView™ screen cloth that enhances the light in your home.
  • Designed with a double-roller system for smooth, long-lasting operation.
Purchasing Options
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Pella Impervia Sliding Windows Features

  • Strongest Material for Windows 9

  • Tested For a Lifetime of Everyday Use

  • Durable Three-Way Corner Joints

Design Options

Pella Impervia fiberglass products have a long-lasting factory powder-coat finish in your choice of five colors. Dual-color frames have White on the interior with Brown, Tan, Morning Sky Gray or Black on the exterior.

Solid-Color Frames

  • black fiberglass frame

    Black

  • brown fiberglass frame

    Brown

  • white fiberglass frame

    White

  • morning sky gray fiberglass frame

    Morning Sky Gray

  • tan fiberglass frame

    Tan

Material

  • 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.
  • Secondary Secure Vent Lock for extra protection.

Downloads & Specifications

Design, Performance & Size Tables

Specifications

2D Cross Section

2D Elevation

3D & BIM

Product Literature

  • large impervia sliding window with top row grilles
  • cross section for impervia sliding windows

Pella Impervia Sliding Window Specs & Install Details

  • Made from the strongest material for windows, our proprietary fiberglass material9
  • 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

Frame
  • Overall frame depth is 3".
  • Nominal wall thickness of Duracast fiberglass composite members is .050" to .070" thick. 
  • Sill is fitted with weep valve assemblies. 
Sash

All sash members have mitered corners bonded with corner lock and sealed with injected polyurethane adhesive.

Weatherstripping

Sash is weatherstripped with a dual fin-type pile weatherstrip around perimeter of sash.

Glazing System
  • Quality float glass complying with ASTM C 1036.
  • 11/16" insulating glass sealed and bonded to sash.
  • High altitude glazing available.
Hardware
  • Vents are equipped with two nylon roller housings containing two acetal rollers each. Vent-panel sash is fully operable for ventilation. Rollers may be removed for cleaning and/or maintenance.
  • Two locks are installed on units 37" high or greater.
  • Locks are zinc die-cast, self-aligning cam action factory-installed on the interlocker 
Additional Hardware options
  • Optional limited opening device nominal 3" opening. Off-white rubber bumper to be installed at the head of the venting unit. 
  • Optional window opening control device allows window to open less than 4" with normal operation, with a release mechanism that allows the sash to open completely. Complies with ASTM F2090-10.

Pella Impervia Reviews

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  • February 25, 2026

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    Why Choose Pella
    Pella was able to perform the additional work required to install the replacement windows.
    Darren D.

  • February 25, 2026

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    Why Choose Pella
    I already have Pella windows and the quote was slightly lower. I liked my sales rep.
    Memorable Aspects
    The installation team was good. They made for a great experience, clean, on time, communicative, did a great job.
    Tracie E.

  • February 23, 2026

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    Why Choose Pella
    Features and cost
    Memorable Aspects
    Very efficient process and great cleanup
    Russell P.
  • See what our customers are saying
    Get honest feedback from real customers who have worked with Pella.
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Frequently Asked Questions

FAQs about My Product

Are sliding windows energy efficient?

Yes, most sliding windows are energy efficient. Energy efficiency is dependent on a number of factors including the material of the window, the type of glass and the number of moving parts.

How do sliding windows open?

Sliding windows glide sideways on a track from either the left or the right side. One operable sash overlaps the other stationary sash when opened.

Are fiberglass windows better than vinyl?

It depends what benefits are most important to you. Pella's fiberglass is the strongest material for windows, offering a low-maintenance and durable finish.9 If you're after a window that's tested to extremes, Pella's fiberglass windows are the way to go. Vinyl windows are easy to care for, energy efficient and budget friendly. Pella’s unique vinyl formula is performance-tested for excellent weathering, durability and color retention.

How long do fiberglass windows last?

There are many factors that affect the actual long-term performance, appearance and functionality of fiberglass windows, but Pella's fiberglass windows are designed for a lifetime of everyday use.

FAQs about Purchasing Online

For online orders, what is your policy for returns and products damaged during shipping?

We’re committed to customer satisfaction. If the product you ordered online is damaged during shipping or you do not receive exactly what you ordered, we want to make it right by refunding you in full or sending you a new product. We do not accept returns of undamaged made-to-order products in which a buyer ordered the incorrect size or color, or decided the product was no longer needed. See pella.com/warranty for additional details and exclusions. If you have questions about returns and refunds, please email shop@pella.com.

How long will it take to receive my online order?

For online orders, a local Pella team member will call within 2-14 weeks to schedule pick up or delivery depending on delivery method and production timing. The time to receive your order varies since all products are made to order based on your specifics.

What’s included in my online window and door purchase?

Product only. When you purchase a window, door or replacement part online, your order will arrive with the product only. Installation is not included. If you need installation parts and accessories, those can be purchased online as well.

Who will install the products I ordered?

When you receive your order, you can either install the product on your own with help from our installation kit. Or, hire a Pella Certified Contractor® to take care of installation for you. They are trained and certified to install Pella products.

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contemporary dining room with black impervia windows

Pella Impervia

Combine the extreme durability of our proprietary fiberglass material with the beauty and energy efficiency you expect from Pella. Windows made of our exclusive fiberglass provides superior strength, which enables thinner profiles and more glass.9 Create bold designs from sleek profiles with our intentionally designed products.

Pella Impervia Sliding Window Inspiration

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