Pella® Impervia® Fiberglass Bay Window
Pella Impervia fiberglass bay windows combine architectural beauty with unmatched durability. These striking windows feature a three-window design with a fixed center window flanked by two operable side windows, creating additional interior space and expansive views. Crafted from Pella's proprietary fiberglass material, these windows deliver superior strength with slim profiles.
- Operable side windows can be casement, single-hung or double-hung windows.
- Commercial grade strength and performance.15
- Offered in 30° and 45° angles to complement both contemporary and traditional homes.
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Pella Impervia Bay Window Features
Enhanced Energy Efficiency
Resists Bends, Dents and Breaks
Design Options
Pella Impervia fiberglass products have a long-lasting factory powder-coat finish in your choice of five colors. Dual-color frames have White on the interior with Brown, Tan, Morning Sky Gray or Black on the exterior.
Solid-Color Frames
Black
Brown
White
Morning Sky Gray
Tan
Dual-Color Frames
White Interior with Black Exterior
White Interior with Brown Exterior
White Interior with Morning Sky Gray Exterior
White Interior with Tan Exterior

Material
- Pella Impervia products are made from our proprietary fiberglass material, the strongest material for windows, engineered for lasting durability.61
- Our long-lasting powder-coat finish meets AAMA 624, which is a highly-rated fiberglass coating.
- Exclusive thermoset material won't expand, warp or sag in summer heat, or shrink and turn brittle in harsh winter conditions.
- Secondary Secure Vent Lock for extra protection.
Downloads & Specifications
Design, Performance & Size Tables
2D Cross Section
Pella Impervia Bay Window Specs & Install Details
- Comes as three windows at 30° or 45° angles and designed for exterior walls with 40” of space or more
- Offered with casement, single-hung or double-hung windows
- Tested and designed for the extremes
- Long-lasting powder-coat finish meets AAMA 624
- Support cables must be attached to structural members capable of supporting 1,300 lbs
Frequently Asked Questions
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Pella® Impervia®
- Fiberglass
- Unmatched strength and lasting durability9
- Exceptionally energy efficient
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