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To: Raymond Duray who wrote (9243)	9/15/2001 3:54:42 PM
From: carranza2	Read Replies (3) \| Respond to of 74559

There is much confusion about presence of asbestos as structural insulation in the WTC. Here's a post from another board that contains an unlinked quote indicating no asbestos. Structural Engineers Offer Insight On World Trade Center Collapse September 11, 2001 According to one of the designers of the World Trade Center (WTC), the towers were originally designed to take the impact of a Boeing 707; and the impact of the aircraft this morning did not take the buildings down. In fact, WTC One stood for 1 hour and WTC Two stood for 1 3/4 hours after impact. Engineers familiar with the chain of events suspect that heat from the massive and extraordinary fires weakened the structures and initiated the progressive collapses. John Hooper, a structural engineer from Skilling, Ward, Magnusson, Barkshire, the structural engineering firm that evolved from Skilling, Helle, Christianson, Robertson, which was the structural engineering firm of record for the WTC provided the following facts to NCSEA: WTC One was 1368' tall, and WTC Two was 1362' tall. Each 110-story tower had a floor plate that was 208' by 208'. The central core of each was 86' square. Around the perimeter of the buildings, columns were spaced a 3'3" on center, with 48"-deep plate girders at each floor. At the third level, the columns transitioned in an arch-like formation to a 10'-0" spacing for the lower story. Floors were supported by steel trusses spanning 60', from the core to the perimeter wall, on each side of the buildings. The buildings are also thought to have been the first buildings to use non-asbestos fireproofing. The fibers of the spray-on fireproofing product were reportedly ceramic rather than asbestos. The architect is Minoru Yamasaki You might note that a web site which presumably contained a lot of the information I'm looking for is noted to have been taken down on September 3, 2001, but I think the date is a typo and the take down took place on September 13, 2001. worldstallest.com By the way, the use of the term "metaphysical" is a reference to a phrase ("metaphysical certitude") coined by Maurice Winn, a frequent poster here. He uses the phrase to tweak the nose of those who are always certain of their knowledge, facts be damned.