9-11, give me a break.

[Thumpalumpacus]

The greater certainty about the material properties involved would allow the team to evaluate whether WTC 7 could have collapsed as a result of burning materials being ejected from WTC 1 and igniting fires on the 12th and 13th floors. The team’s analysis eventually led them to conclude that even with very high estimates for the amount of combustible materials present in office buildings — using the maximum amounts allowed in the building codes — and making many other generous assumptions, such as having two floors “totally ablaze with raging inferno fires,” WTC 7 still would not collapse.

The fires that caused the collapse were obviously lower than the 12th and 13th floors:



Additionally, the color of the smoke tells the canny fireman that petrochemicals (most likely plastics, in this case) were highly involved. Those burn are very high temperatures.

We have a hot fire on the lower floors of a large heavy building that burned unabated for hours. Steel loses 50% of its load-strength after 30 minutes exposed to 1300°F heat. The steel in the lower part of the building failed.