FIBERGLASS WINDOWS by Pella Windows and Doors Made from extremely durable fiberglass, Pella Impervia® offers high-performing, low-maintenance fiberglass replacement windows that provide the quality appearance of painted wood. The Impervia line is made from Duracast, a patented fiberglass composite that resists warping in the summer months and doesn’t become brittle throughout winter. If you’re in Saint Louis and looking for top-of-the-line durability and high energy efficiency, while still gaining the impeccable visual allure of a painted wood window, then Pella Impervia windows are for you. Protected by one of the best warranties in the market, Pella Impervia replacement windows involve little to no maintenance, ensuring that your windows will look outstanding year after year. Pella Impervia® Pella Impervia® Incredibly strong fiberglass Duracast®. An extremely durable material available in windows and doors. Excellent performance. Excellent energy efficiency. FIBERGLASS WINDOW COLOR OPTIONS Pella Impervia fiberglass windows offer numerous color options to complement your space. We allow you the flexibility to pick the perfect windows at a budget you can afford. Pella utilizes an environmentally friendly painting process that eliminates VOCs, keeping the air in your home healthier. If you want to get a closer look at the Pella Impervia line, drop by our showroom in Saint Louis or schedule a free in-home consultation and find the perfect windows for your room. Schedule Now!