top of page

WTC 7 Building Collapse Reports


The Salomon Brothers building (WTC 7) would have been the first Type-1 (fire resistive) high-rise building to ever collapse from fire. If the NIST report is correct, then it should have been the most thoroughly investigated building collapse ever. And if fire was the cause, then this should have changed everything for high-rise fire operations, safety, and construction. 


The investigation authority for WTC 7 was delegated to the National Institute of Standards and Technology (NIST). For reasons we don't know, most of the physical evidence of this building collapse was allowed to be destroyed before the investigation even started. And, the investigation was based primarily upon a computer model of the collapse.

We invite you to look at the NIST report, specifically compare their computer model to the actual collapse. And then compare it to the below reports: one from within the fire service, and one from within the building engineering industry.   

Official Government Report

National Institute of Standards & Technology (NIST) 
Report on the Collapse of World Trade Center Building 7

Lead - Shyam Sunder
Report released: November, 2008 (7 years after collapse)

The NIST WTC 7 (Salomon Brothers Building) World Trade Center Disaster Investigation was a report that the National Institute of Standards and Technology (NIST) conducted to establish the likely technical causes of the three building failures that occurred at the World Trade Center following the September 11, 2001 terrorist attacks.

Click here for full NIST pdf report.

P.A.P.A. endorsed Independent Report

Sudden Building Collapse Analysis

Lead - P.S. Kayley, U.K. Fire Service
Report released: July, 2016

In order to reach a responsible and reliable understanding of the true level of risk, this evaluation has attempted to honestly and objectively follow all of the evidence and the data, wherever it might lead, without prejudice. The details and evidence from within the original government reports, independent expert reports regarding the collapse and its circumstances, as well as the experiences and evidence of witnesses and emergency personnel present at the incident, have all been included and evaluated.

Click here for full Sudden Building Collapse pdf report.

And, below is the trailer for the documentary created from this report.

University of Alaska, Fairbanks Report

A Structural Reevaluation of the Collapse of World Trade Center Tower 7

Lead - J. Leroy Hulsey, University of Alaska, Fairbanks
Report released: March 2020

This is a 4-year study of the collapse of the (Salomon Brothers) World Trade Center Building 7 (WTC 7) — a 47-story building that suffered a total collapse at 5:20 PM on September 11, 2001, following the horrible events of that morning. The objective of the study was threefold: (1) Examine the structural response of WTC 7 to fire loads that may have occurred on September 11, 2001; (2) Rule out scenarios that could not have caused the observed collapse; and (3) Identify types of failures and their locations that may have caused the total collapse to occur as observed.

Click here for full University of Alaska pdf report.

And, below is the trailer for the documentary created from this report.

bottom of page