Deadly Surfside Condo Collapse Stemmed From Flaws Dating Back to 1981, Probe Finds

The partial collapse of the Champlain Towers South condominium in Surfside, Florida, which resulted in the deaths of 98 people on June 24, 2021, was caused by design and construction flaws originating in 1981, according to a federal investigation by the National Institute of Standards and Technology (NIST). Investigators determined that progressive failures began in early June 2021, three weeks prior to the catastrophic event, due to decades of corrosion and initial construction defects. Judith Mitrani-Reiser, co-lead of the NIST investigation, stated that while buildings are designed with margins of safety to withstand loads beyond expected use, the Champlain Towers South had insufficient margins from its inception. The investigation identified two critical connections in the underground parking garage, between the columns and the pool deck slab, that experienced a "punching shear failure." This type of failure occurs when supporting columns penetrate a cracking concrete floor. These initial failures in early June 2021 initiated a cascading effect, as the shifting pool deck redistributed structural load to adjacent, unprepared connections, ultimately leading to the building's partial collapse on June 24, 2021.