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Zenith Series Windows
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Experience comfort and home efficiency with Alpen’s Zenith fiberglass residential windows. Zenith blends durability with North American style and functionality, offering energy efficiency, comfort, and lasting craftsmanship.
- NFRC Certified to R-10
- ENERGY STAR® Most Efficient, and DECLARE label “Red List Approved”
- Variety of window types in customizable colors, including black
- Proudly designed, developed and manufactured in the USA
Design Options
Fixed Windows
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Midnight Black
Midnight Black
Pure white
Umber Bronze
Bronze
Alpine Ivory
Sand Dune
Riverstone
Boulder Grey
Metallic Silver
Bison Brown
Red Canyon
Pine
Stormy Sky
Verde Valley
Deep Water
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Standard Encore Tango Handle
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Black
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Aluminim
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Nickel
Bronze
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Brass
Accompanying Lock Handle:
Black
Aluminim
Nickel
Bronze
Brass
Bronze
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Accompanying Lock Handle:
Black
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Nickel
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Bronze
Black
Nickel
Bronze
Accompanying Lock Handle:
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Black
Nickel
Bronze
Triple-pane
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Whole-window NFRC Ratings up to R-10 (U-0.10) for fixed windows and R-7 (U-0.14) for operable windows.
Long strand pultruded fiberglass frame.
Super-insulating closed-cell foam in both frame and sash cavities enhances thermal insulation properties.
Industry leading lightweight high-performance ThinGlass (triple and quad-pane).
Certified, proprietary gas retention technology allows us to offer gas-filled windows to customers at high altitude.
Air infiltration rates as low as 0.01 CFM per square foot.
Deeper glass pocket allows for enhanced sound reduction.
As a global leader in ultra energy efficient window, door and glass solutions, all Alpen Zenith Series fiberglass windows and doors are carefully designed to meet the energy efficiency needs of our changing world.
Discover our Product Catalog for more information.
This specification system has been prepared to assist design professionals in the preparation of project or office master specifications. It follows guidelines established by the construction specifications institute, and therefore maybe used with most master specification systems with minor editing.
INSTALLATION GUIDELINES:
The Zenith Series offers a full lifetime warranty for as long as you own and reside in your building.
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Why Choose Zenith?
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Wide Range of Sizes and Thicknesses
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Customization for Rigorous Standards
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Versatile Coatings and Configurations
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Exceptional Durability
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Seamless Integration
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Lightweight Design
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Low Embodied Carbon
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Affordability Without Compromise
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Made in the U.S.A. and Serving North America
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Unmatched Thermal Performance
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Certified for Passive House
Alpen was the first North American window manufacturer to achieve dual certification from both PHIUS and PHI. We specialize in high-performance building products, with a focus on energy-efficient windows and doors. Our Passive House-certified products help architects, general contractors, and developers meet or exceed modern energy codes and build climate-responsive buildings.
See Zenith in the Field
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Frequently Asked Questions
What’s the difference between Zenith and Tyrol?
Zenith is an energy-efficient fiberglass window with North American outswing functionality, achieving up to R-10 rating. Tyrol uses fiber-reinforced uPVC frames with European inward swing functionality, achieving up to R-11. Zenith focuses on fiberglass durability and environmental benefits, while Tyrol highlights European engineering and aesthetic versatility. Both products are energy star certified.
Are fiberglass windows and doors energy efficient?
Yes, fiberglass is a highly energy-efficient insulator with low thermal conductivity, helping maintain consistent indoor temperatures. Fiberglass stability prevents air leakage and can accommodate energy-efficient triple or quadruple glazing.
What type of windows will be the most energy efficient?
The most energy-efficient windows use advanced frame materials with high thermal resistance. Then they incorporate multi-pane insulated glass units with gas fills between the panes. Finally, precise construction prevents air leakage through gaps.
How long do fiberglass windows last?
Fiberglass window manufacturers build products to last 50 years or more. Resistant to warping, rotting, and corrosion, fiberglass withstands harsh weather without deterioration. Its strength and stability maintain window integrity over time, ensuring efficiency and functionality for decades. The Zenith Series includes a full lifetime warranty while you own and reside in your home.
Why do fiberglass doors and windows cost more than alternatives?
When considering vinyl vs fiberglass windows, fiberglass has a higher material cost than alternatives. It requires complex manufacturing processes like weaving fibers into resin-impregnated fabrics under controlled conditions. Though costlier upfront, fiberglass offers superior durability, thermal efficiency, and design flexibility.
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