Post-Construction Modification to Fire Protection and Life Safety Systems of the World Trade Center Towers. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-1H)

Published

December 1, 2005

Author(s)

R A. Grill, D A. Johnson

Abstract

This report was prepared to support the analysis of building and fire codes and standards of the National Institute of Standards and Technology World Trade Center (WTC) Investigation. The purpose of this report is to document the Port Authority of New York and New Jersey guidelines for inspection, repair, and modifications to fire protection and egress systems in WTC 1, 2, and 7. This includes guidelines governing the inspection and upgrading of fire alarm and fire suppression systems; the reapplication of fireproofing; and the upgrading of elevators, hoistways, and elevator lobbies. This report also documents repairs and modifications made to the fire protection and life safety systems on the affected floors of WTC 1 and WTC 2.

Citation

National Construction Safety Team Act Reports (NIST NCSTAR) - 1-1

Report Number

1-1

NIST Pub Series

National Construction Safety Team Act Reports (NIST NCSTAR)

Pub Type

NIST Pubs

Download Paper

Local Download

Citation

Grill, R. and Johnson, D. (2005), Post-Construction Modification to Fire Protection and Life Safety Systems of the World Trade Center Towers. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-1H), 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=101343 (Accessed October 14, 2025)