Pella® Impervia® Fiberglass Windows
Fiberglass windows and doors delivering unmatched strength and lasting durability with proven performance and sleek, timeless style.
A Trusted Leader Since 1925
At Pella, we don’t just create windows and doors. We innovate with purpose, design with passion, build with integrity and deliver with pride.
Rated # 1
by homeowners for innovation
Our drive to give our customers better solutions, improve what we do and how we do it has earned us more than 150 patents on groundbreaking innovations. Our innovations have helped change the window industry and have even set new standards for hardware. Like the revolutionary, patent-pending Easy-Slide Operator hardware for casement and awning windows, which allows you to simply slide to open and close without the effort of cranking.
Rated # 1
by homeowners for highest quality
We sweat the details so you don’t have to, delivering products created specifically for you. We tried to count the number of quality checks that we do in a typical hour, but we had to stop at 7,502 to get back to work. At Pella, just meeting a standard isn’t enough. That’s why we test beyond requirements and set a new standard to ensure quality windows and doors that are built to last.
one of the strongest limited lifetime warranties
You can feel confident in your investment. We pride ourselves on providing exceptional quality, exceeding expectations and going beyond requirements. That's why we stand behind all of our windows and patio doors with a limited lifetime warranty.
Available in These Window & Patio Door Styles:
Fiberglass is strong. We made it the strongest
Trusted in tools, boats, bridges and more, fiberglass is a naturally strong and durable material making it a superior choice for windows and patio doors. As a leader in innovation since 1925, we created our proprietary fiberglass to give our customers more — more strength for long-lasting use and thinner profiles with more glass.
Strength at its core.
Through a one-of-a-kind manufacturing process, our fiberglass starts with our structural mat which places rovings in a specific, intricate order to meet Pella’s high strength standards.
Enduring thermoset material
With more strategically placed rovings, 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.
Tough-as-nails powder coat finish.
Factory-applied and baked on, our long-lasting powder-coat finish resists chipping, chalking and fading for long-lasting durability and beauty.
Strongest. Innovative. Tough-as-nails
Superior Strength and Durability
Our proprietary fiberglass is superior in strength to wood, vinyl, aluminum, wood/plastic composites, and other fiberglass materials. On average, Pella's fiberglass is 100x more impact resistant than a leading wood/plastic composite.
Revolutionary Hardware Solution
Open your casement and awning windows with one simple motion using the revolutionary Easy-Slide Operator
Durable Three-Way Corner Joints
For added strength, durability and reliable water performance, Pella Impervia products are secured with corner locks, metal fasteners and injected with sealant.
Larger Window Designs
The superior strength of Pella’s fiberglass allows you to combine standard and special-sized windows together to create larger, unique combinations, made just for your remodel or new construction project.
Energy-efficient dual- and triple-pane glass options with argon help slow the transfer of heat, keeping your home more comfortable year-round — even in the scorching heat of the summer or the cold of the winter. Insulating foam inside the frame is also available for increased energy efficiency.
Provide outstanding resistance to water, wind and outside noises — while increasing energy efficiency, security and ease of operation.
Durable Powder-Coat Finish
Our long-lasting powder-coat finish resists chipping, chalking, and fading and keeps these timeless style windows looking great. Available in five colors, including Black.
Windows & Doors Options
Pella® Impervia® windows and patio doors feature a low-maintenance, durable powder-coat paint finish. Dual-color frames allow you to choose a different color for the exterior with a White interior.
Glass & Additional Energy Efficiency Upgrades
InsulShield® Low-E Glass
Additional Glass Options
Grilles are color-matched to your window or patio door interior and exterior frame color
In addition to the patterns shown here, custom grille patterns are available
Flat - Conventional screens come standard. Optional InView™ screens let in 14% more light and are 8% more open for improved airflow compared to conventional fiberglass screens
Casement & Awning
Select from two window hardware options for casement and awning windows. The revolutionary, patent-pending, Easy-Slide Operator allows you to simply slide to open, without the effort of cranking. Precision venting technology allows you to open your window exactly where you want. And its sleek design provides an undisrupted look. Or select the fold-away crank, that folds neatly away, against the window frame. Neither solution will interfere with roomside window treatments
Sliding, Single- & Double-Hung
Pella’s cam-action locks pull the sashes against the weatherstripping on single-hung, double-hung and sliding windows for a tighter seal.
Sliding Patio Door
Open and close the door with one hand with a convenient thumblock