Understanding Substantial Structural Damage in the International Existing Building Code

This job aid explains how Substantial Structural Damage (SSD) is defined and applied within the International Existing Building Code (IEBC) for existing buildings. It details the criteria for SSD, the assessment process, and the repair and retrofit requirements triggered by SSD, with specific reference to wind, seismic, and snow hazards. The document clarifies distinctions between SSD and Substantial Damage (SD), outlines the roles of code officials and design professionals in SSD determinations, and summarizes relevant code provisions for various building types and occupancies. It is intended for use by professionals involved in post-disaster repair, code compliance, and building safety evaluations.