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Fiberglass Replacement Windows

Behind the Strength of Pella’s Proprietary Fiberglass

Pella's proprietary fiberglass material is the strongest material for windows and patio doors, engineered for lasting durability.*

*Disclosure: Pella’s proprietary fiberglass material has displayed superior strength over wood, vinyl, aluminum, wood/plastic composites, and other fiberglass materials used by leading national brands in tensile and 3-point bend tests performed in accordance with ASTM D638 and D790 testing standards.

Explore Your Options With an Expert

Expert craftsmanship takes expert product knowledge. A Pella windows and doors expert can help you pick out the window that fits your home — and your style. Find your local Pella representative to schedule a free in-home consultation, measurement, and estimate. Or visit your nearest showroom for a guided tour of your options. No pressure. No cost to you.

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*Study of homeowner perceptions of leading national brands. Study commissioned by Pella, 2021.