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Originally Posted by Scootermuze
when the engineers that did the so called investigation can't even come up with anything other than speculation and opinions..
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also, the above is a lie.
A federal technical building and fire safety investigation of the collapses of the Twin Towers and 7 WTC has been conducted by the United States Department of Commerce's National Institute of Standards and Technology (NIST). The goals of this investigation, completed on April 6, 2005, were to investigate the building construction, the materials used, and the technical conditions that contributed to the outcome of the WTC disaster. The investigation was to serve as the basis for:
Improvements in the way in which buildings are designed, constructed, maintained, and used
Improved tools and guidance for industry and safety officials
Revisions to building and fire codes, standards, and practices
Improved public safety
The report concludes that the fireproofing on the Twin Towers' steel infrastructures was blown off by the initial impact of the planes and that, if this had not occurred, the towers would likely have remained standing. The fires weakened the trusses supporting the floors, making the floors sag. The sagging floors pulled on the exterior steel columns to the point where exterior columns bowed inward. With the damage to the core columns, the buckling exterior columns could no longer support the buildings, causing them to collapse. In addition, the report asserts that the towers' stairwells were not adequately reinforced to provide emergency escape for people above the impact zones.