Alpen High Performance Products Zenith Series ZR-5 / 525 windows and doors, powered by AlpenGlass™, are our best value fiberglass products, delivering thermal and structural performance at an affordable price. These low maintenance windows require no sanding or painting and were designed especially with multifamily housing in mind. The ZR-5 Contractor series of hand-crafted, custom made windows and doors can be used in both new construction and remodeling/replacement applications, delivering the durability and performance of fiberglass to any high-volume project.

Benefits of the Alpen Zenith Series ZR-5:

• Thermal performance up to R-5.9
• 99.5% UV protection
• Our highest value fiberglass option
• Virtually maintenance free
• Reduced interior condensation
• Unique design keeps the window warmer in the winter and cooler in the summer
• Architectural freedom allowing for more glass in your design
• Can contribute to LEED credits

The styles available are displayed here, on the left!