Although simple in concept, the physics and technical design considerations of glass spandrels and shadow boxes can be quite complex and must be carefully considered.
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The American Architectural Manufacturers Association (AAMA) and the Insulating Glass Manufacturers Alliance (IGMA) jointly released online resources providing a general overview of the standards, specifications, and test methods used in the window, door, and skylight industry related to glass and glazing systems.
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The appearance of condensation between the panes of an insulated glass (IG) unit is an indication the hermetic seal of the unit has been breached or compromised, thereby allowing outside moist air to infiltrate the air space where it condenses on the interpane surfaces of the glass. One could argue semantics, but this is the generally accepted meaning of the word “failure” as it relates to IG units. In this case, the failure is characterized by an ever-present condensation between the glass panes.
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Among the many reasons architects specify glass are its beauty and versatility. In addition to offering the full spectrum of transparency, color, and high environmental performance as vision glass components, this material can be opacified in spandrels to create visual flair.
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