Fiberglass Windows

Choose your level of performance

Alpen Windows 925 Series
Alpen Windows 725 Series
Alpen Windows 525 S-Series
Alpen Windows 525 Series

The cutting-edge fiberglass framing systems of Alpen HPP offer superior performance to conventional fenestration materials in a number of ways: durability, stability and efficiency, making it the optimum material for super-insulating windows and preserving overall performance for the life of a window.

  • Alpen HPP Fiberglass WindowsExtreme corrosion resistance: fiberglass is the only framing material that particularly resists environmental damage caused by corrosive salt air or high temperatures.
  • Superior insulator even in extreme environments: dimensional stability even in extreme thermal cycling (heat, cold humidity), Alpen Windows fiberglass frames offer the aesthetic of classic wood clad windows but with better insulation.
  • High condensation resistance: the insulating nature of fiberglass prevents condensation and helps keep humidity within a proper range, this limits the growth of molds and mildew and helps keep your home’s interior air quality healthy.
  • Superior strength to weight ratios: Alpen Window’s fiberglass series are ideal for large window openings – they are 86% of the yield strength of aluminum and are pound-for-pound, stronger than aluminum.
  • Practically maintenance free: the inherent strength and nature to distribute impact loads even in sub-zero temperatures, fiberglass frames will not suffer the pockmarked surface damage that is common to wood and aluminum windows, and because fiberglass takes paint easily with excellent adhesion, you can change the color of your windows any time you like.
  • Very low coefficient of thermal expansion and contraction: stresses on seals, caulks and joints are minimized, contributing to higher efficiency windows and tight seals that are resistant to air leakage and water penetration.
  • High glass to frame ratio: the strength of our fiberglass frames means more of a viewing area because of the higher glass to frame ratio, compared to wood windows.