Pella® Impervia® Fiberglass Casement Window

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.

Pella’s proprietary fiberglass is the strongest material for windows, engineered for lasting durability.⁶¹ Our exclusive fiberglass will never rot or corrode, and it resists dents, bends and breaks.

While triple-pane windows cost a little more than single- and double-pane windows, they offer many benefits. Energy-efficient triple-pane windows help reduce sound and energy costs. Pella triple-pane windows allow for increased energy efficiency while blocking 86 percent of the sun’s ultraviolet rays.

Yes, Pella's fiberglass window frames have virtually no expansion and contraction to help improve energy efficiency, reduce the risk for seal failure and provide long-term stability for dependable operation. In addition to the material of the window frame, glass types and coatings also affect the energy efficiency of a window.

Because casement windows are easy to operate with one hand, they are commonly used in hard-to-reach areas like over a kitchen sink or bathtub. Casement windows are also popular in bedrooms, living rooms and home offices.

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.

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.

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.

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.