NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Structural Fire Response and Probable Collapse Sequence of World Trade Center Building 7 (Volume 2). Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-9) ***DRAFT for Public Comments***

Published

Author(s)

Therese P. McAllister, Richard G. Gann, Jason D. Averill, John L. Gross, William L. Grosshandler, James R. Lawson, Kevin B. McGrattan, William M. Pitts, Kuldeep R. Prasad, Fahim Sadek, Harold E. Nelson

Abstract

This is the primary technical report on the National Institute of Standards and Technology (NIST) investigation of the collapse of World Trade Center Building 7 (WTC 7), conducted under the National Construction Safety Team Act. The investigation objectives were to determine (1) why and how WTC 7 collapsed, (2) all technical aspects of fire protection, occupant behavior, evacuation, and emergency response, (3) what practices and procedures were used in the design construction, operation and maintenance of WTC 7, and (4) areas in current building and fire codes, standards, and practices that warrant revision. Objectives 1, 2, and 3 are addressed in this report. Objective 4 is addressed in the WTC 7 summary report, NIST NCSTAR 1-1A. This report provides technical details of all aspects of the investigation.
Citation
National Construction Safety Team Act Reports (NIST NCSTAR) - 1-9
Report Number
1-9
NIST Pub Series
National Construction Safety Team Act Reports (NIST NCSTAR)
Pub Type
NIST Pubs

Download Paper

Local Download

Keywords

building evacuation, emergency response, fire safety, structural collapse, tall buildings World Trade Center
Buildings and Construction, Fire and Disaster and failure studies

Citation

McAllister, T. , Gann, R. , Averill, J. , Gross, J. , Grosshandler, W. , Lawson, J. , McGrattan, K. , Pitts, W. , Prasad, K. , Sadek, F. and Nelson, H. (2008), Structural Fire Response and Probable Collapse Sequence of World Trade Center Building 7 (Volume 2). Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-9) ***DRAFT for Public Comments***, National Construction Safety Team Act Reports (NIST NCSTAR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909257 (Accessed October 16, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created August 1, 2008, Updated February 19, 2017
Was this page helpful?