NIST Releases Final WTC 7 Investigation Report

The National Institute of Standards and Technology (NIST) today released its final report on the Sept. 11, 2001, collapse of the 47-story World Trade Center building 7 (WTC 7) in New York City. The final report is strengthened by clarifications and supplemental text suggested by organizations and individuals worldwide in response to the draft WTC 7 report, released for public comment on Aug. 21, but the revisions did not alter the investigation team’s major findings and recommendations, which include identification of fire as the primary cause for the building’s failure.

The extensive three-year scientific and technical building and fire safety investigation found that the fires on multiple floors in WTC 7, which were uncontrolled but otherwise similar to fires experienced in other tall buildings, caused an extraordinary event. Heating of floor beams and girders caused a critical support column to fail, initiating a fire-induced progressive collapse that brought the building down.

In response to comments from the building community, NIST conducted an additional computer analysis. The goal was to see if the loss of WTC 7’s Column 79—the structural component identified as the one whose failure on 9/11 started the progressive collapse—would still have led to a complete loss of the building if fire or damage from the falling debris of the nearby WTC 1 tower were not factors. The investigation team concluded that the column’s failure under any circumstance would have initiated the destructive sequence of events.

Other revisions to the final WTC 7 report included:

* Expanding the discussion of firestopping, the material placed between floors to prevent floor-to-floor fire spread;
* Clarifying the description of thermal expansion as it related to WTC 7’s shear studs and floor beams; and
* Explaining in greater detail the computer modeling approach used to define where and when the fire in WTC 7 started and the extent of window breakage as a result of fire.

With the release of the final WTC 7 report, NIST has completed its federal building and fire safety investigation of the WTC disaster that began in August 2002. A three-year study of the collapses of the WTC towers (WTC 1 and 2) was completed in October 2005. More than 20 changes in the U.S. model building and fire codes have already been adopted based on the findings and recommendations from the investigation.

NIST will now work with various public and private groups toward implementing additional changes to the U.S. model building and fire codes including those based on the 13 recommendations from the WTC 7 report (one new and 12 reiterated from the towers investigation).

The complete text of the final WTC 7 report, a video describing the WTC 7 investigation findings, a of all comments received on the draft WTC 7 report, a chart tracking the progress toward implementing all of the NIST WTC recommendations, and other materials may be accessed at

Media Contact: Michael E. Newman,, (301) 975-3025

Public comments

...are here.

My own personal comment is there, and quotes the Bhagavad Gita, for Sivaraj Shyam Sunder and the many Indians involved in the NIST investigation. Interestingly, I couldn't find one Muslim on their team.

NIST is now synonymous with disgrace and dishonor.

Krishna said -
"Considering your dharma, you should not vacillate. For a warrior, nothing is higher than a war against evil. The warrior confronted with such a war should be pleased. Arjuna, for it comes as an open gate to heaven. But if you do not participate in the battle against evil, you will incur sin, violating your dharma and your honor."
"The story of your dishonor will be repeated endlessly: and for a man of honor, dishonor is worse than death."
(Easwaran 64)

Your anger is justified

This report is indeed "malevolent and revolting".

“On the altar of God, I swear eternal hostility against all forms of tyranny over the mind of man."--Thomas Jefferson

Progressive collapse?

Pretty transparent that this is a bunch of bull. Even without any engineering degree, I can look at the videos of the collapse and I see one momentous fast collapse, nothing progressive about it.

it's obvious

An isolated fire or fires could not cause a symmetric collapse of a building at free fall speed into its own footprint even if the building was made of lincoln logs let alone a steel framed building. It does not take but one minute, let alone 7 years, to see that. It is so obvious that even a six year old child can figure it out.


I and my brother were watching the destruction of WTC 7 on video. My niece's 8-year-old daughter (never exposed to such material before) came into the room, watched the repeating video and said (in Finnish of course): "Building crumbles." I asked her if she saw what happens. She exclaimed "Yes. A bomb!"

Thermal expansion is

the greatest force in the universe resulting in defying the laws of gravity and capable of changing states of matter like steel to liquid and dust. Yeah we all believe that one. The only thermal expansion I am interested in is your human wrists in handcuffs you traitors.

What's the latest on Barry Jennings death? I haven't seen anything recently.

NIST- disgrace

wow, glad Kevin's comment wasn't directed at me, i still got scorched.

good one from jkeogh- those cartoons they made that show the morphing WTC 7 collapse need to be made public so their "computer modeling" can be examined.

Judy Wood's comment is on there with it's entire 121 pages; i didn't bother going past pg. 3 with the pics of Hurricane Erin.

9/11 Truth, Part 7 of 11: Destruction of World Trade Center 1, 2 & 7, “The Air is Safe to Breathe” Lies & Giuliani“the-air-is-safe-to-breathe”/

Great quote Kevin; thanks for all you do, you are a formidible..


Kind regards and the greatest respect John

9/11 24/7 UNTIL JUSTICE!!