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Fiberglass Windows

Why Choose Fiberglass Windows?

Trusted in tools, boats, bridges and more, fiberglass is a naturally strong and durable material, making it a superior choice for windows. Pella’s proprietary fiberglass material 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.

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Fiberglass Window Benefits

Durable and Strong

The best fiberglass windows for your home are incredibly strong and durable. This makes Pella's proprietary fiberglass a clear choice for long-lasting durability. Our fiberglass is stronger than a leading wood/plastic composite, conventional fiberglass, wood and vinyl.61 Our fiberglass windows are designed and tested for a lifetime of everyday use. Resisting dents, bends and breaks, our 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.

Weather Resistant

Our proprietary fiberglass is a thermoset material, meaning it won’t melt or breakdown when exposed to environmental temperature swings like other materials can. Tested from -40ºF to 160ºF, our relentlessly durable fiberglass is designed to provide outstanding resistance to water, wind and outside noises. It can withstand subzero cold, the most extreme heat and the rigorous performance requirements of a commercial building.61,43


Our extremely durable fiberglass material will never rot or corrode and is naturally resistant to water and bugs. Our long-lasting powder-coat finish meets AAMA 624 which is the highest rated fiberglass coating among leading national competitors. Baked on in the factory, our heavy-duty powder-coat finish resists chipping, chalking and fading - so you never need to paint or refinish your Pella fiberglass windows.

Pella® Impervia®
Pella Impervia windows are tested and designed for a lifetime of everyday use. Engineered to last with sleek, timeless style, our fiberglass awning, casement, sliding, single-hung, double-hung and picture windows are backed by one of the strongest warranties in the business.
Pella® Impervia® Window Types
Fiberglass Window Features & Options
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Pella products are backed by some of the strongest warranties in the business.

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