Protective overglaze is not necessary for a healthy, enduring stained glass window. If not properly installed it can create more problems than it cures. It is important to make a decision based on your own unique circumstances. When protective overglaze is installed, consideration of materials, framing and ventilation is critical.

Potential Benefits

  • Significantly decreases wind load exposure
  • Can increase energy savings
  • Provides vandalism and/or security protection
  • May guard against environmental pollutants and some ultra-violet light exposure

Potential Drawbacks

  • Inhibits natural ventilation
  • May cause retention of condensation
  • Limits access for maintenance of windows and millwork
  • Offers only minimal energy payback
  • Can cause increased heat levels in the stained glass, leading to damage of the window
  • May adversely affect the architectural aesthetics of the building

Before                                                                                                   After

Bottom section of above window