Structural sealant glazing has attracted considerable attention due to its inherent glass retaining method which allows smooth exterior glass walls interrupted only by narrow weatherseal joints. The technique has become increasingly popular with owners and architects since its inception in the early 1970's.

In 1990 it was determined that a five story office building nearing completion had structurally glazed insulating glass units in multi-story bay windows that had been incorrectly installed. Verification of the required structural glazing design was performed to compare with the as-built conditions, and re-glazing the structural silicone glazing joints was indicated to be warranted.

The construction team desired to perform the re-glazing without removing the installed units for cost and time reasons. In-situ re-glazing of a single insulating glass unit was performed as a test of the proposed remedial technique. The test was deemed successful and the remaining defectively glazed units were re-glazed in-situ.

The design and construction circumstances that led to the situation requiring the re-glazing, the lessons learned during their resolution, the in-situ re-glazing techniques utilized, and comments on the need for potential re-glazing of structurally glazed systems are presented.