Federal investigators reveal cause of 2021 Surfside condo collapse Federal investigators have determined that failures in two garage column connections beneath the pool deck, occurring three weeks prior to the collapse, initiated a chain reaction leading to the catastrophic failure of the Champlain Towers South. The investigation found that the building, constructed 40 years ago, deviated from its original design and lacked sufficient margins against failure, exacerbated by later additions like heavy planters and paving stones. Despite prior knowledge of structural damage and ignored warning signs, the building ultimately succumbed to these compounding deficiencies.

• The 2021 collapse of Champlain Towers South was caused by the failure of two garage column connections beneath the pool deck.
• This failure, occurring three weeks before the collapse, led to cracks and load redistribution in the pool deck, initiating a domino effect.
• Investigators found the building failed to meet safety requirements at the time of its construction 40 years ago.
• Deviations from the original design, addition of weight to the pool deck, and corrosion contributed to the structural deficiencies.
• A 2018 survey had already identified major structural damage and failed waterproofing in the pool deck.
• Warning signs of the imminent collapse were ignored prior to the event.