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
Resists Bends, Dents and Breaks
Enhanced Energy Efficiency
Strongest Material for Windows 9
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
FAQs about My Product


Get windows ready to handle virtually anything life throws at them. Pella Impervia products are made from our proprietary fiberglass, the strongest material for windows.9
Pella’s exclusive fiberglass will never rot or corrode and resists dents, bends and breaks — and the list goes on. With a tough-as-nails powder-coat finish, your windows will never need to be painted or refinished.
Compare Bay Windows
Pella® Impervia®
- Fiberglass
- Unmatched strength and lasting durability9
- Exceptionally energy efficient
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