NIST Technical Findings Identify Cause of 2021 Champlain Towers South Collapse

NCST determined that on June 24, 2021 a collapse of the 12-story Champlain Towers South in Surfside, Florida, killed 98 people. The failure began in early June when two garage-column-to-pool-deck connections suffered punching-shear failure, letting cracks spread and loads shift over three weeks before the tower fell.

The National Institute of Standards and Technology

Investigators identified two primary causes for the narrow safety margins: severe deviations from 1981 building codes in the original design, and construction that did not follow the drawings. Added pool-deck modifications, long-term corrosion, and cumulative loads further weakened the structure.

WTVJ - NBC 6 - Miami

Co-lead investigators Judith Mitrani-Reiser and Glenn Bell said the building’s margins against failure were too narrow due to design and construction deviations, and thanked survivors, families, and partners for their assistance.

WTVJ - NBC 6 - Miami

The collapse spurred a $1.2 billion class-action settlement involving more than 30 defendants, funding victim compensation and the $120 million purchase of the site by Dubai-based DAMAC Properties. DAMAC plans The Delmore, a luxury tower with two penthouses and units starting at $15 million, but sales have stalled amid local opposition.

The Independent

Survivor activist Martin Langesfeld decried the lack of a memorial and redevelopment. Attorney Rachel Wagner Furst said the settlement implicated parties; Donna DiMaggio Berger warned Florida regulations shift safety costs onto consumers. Mayor Daniella Levine Cava warned that “condo vultures” could worsen affordability.

NPR

NPR reported that two-thirds of the tower collapsed after the pool deck gave way, killing 98. First responders conducted a multi-day search, while a memorial now displays all victims’ names.

ABC Miami Local 10 WPLG

Sources concur on the cause; however, no charges exist and families disagree on memorial versus redevelopment, with NCST report pending.

The Independent

• “In the case of Champlain Towers South, however, these margins against failure were too narrow from the start.” — Judith Mitrani-Reiser, NCST Co-lead Investigator

The National Institute of Standards and Technology

• “The low margins against failure were primarily caused by two factors,” — Glenn Bell, NCST Co-lead Investigator

The National Institute of Standards and Technology

• “It’s prime real estate, but it came at the cost of 98 lives.” — Martin Langesfeld, victim’s brother and activist

The Independent

• “ROSSELY: We should have spent a bit more time on due diligence on community reaction rather than on the physical property itself.” — Jeffery Rossely, DAMAC Properties representative

NPR

NCST will publish a final report with recommendations. Florida lawmakers are considering stricter inspections and shorter statutes of limitation. The memorial remains unfunded, and The Delmore construction proceeds.

The Independent