This Paper addresses issues related to the appearance of insulating glass unit (IGU) edges in both captured and silicone structural glazed (SSG) commercial glazing systems. Components of IGU edges are discussed, and acceptance criteria provided where appropriate. It is intended to address both vision and spandrel IGUs. Viewing and acceptance criteria are the same for both vision and spandrel units. These guidelines assume IGUs are sized correctly for the opening dimension and glazed according to GANA glazing guidelines. It was written to address two lite (double glazed) IGUs. However, much of the information pertains to IGUs with three or more lites (triple glazed, quad glazed, etc.) The Technical Services Division of the National Glass Association (NGA) has produced this Glass Technical Paper solely for informational purposes. This Paper was developed by dedicated member volunteers and subject matter experts. The document was originally published in October 2011. This current version was published in March 2015.

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