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For high-volume contractor projectsZenith Series ZR-5 / 525

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 can be installed in new construction and remodeling/replacement applications. The ZR-5 Contractor series of hand-crafted, custom made windows and doors can be use 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


Click here to download the Alpen Zenith Series ZR-5 / 525 window and door Data Sheet.