I recently read an article by Charles Buell Inspections Inc. on ActiveRain about roof ventilation and how it doesn’t impact the longevity of roofing asphalt shingles. 450 more words
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What was it about the construction of the NYC World Trade Centre buildings that made them collapse so easily in case of a very hot fire?
Answer by David Kahana:
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The design of the towers was unique among steel frame buildings of the time. They were built like a tube within a tube, with the floors supported by trusses that tied on to supporting columns on the outer walls as well as on to the core columns making up the inner tube, where the elevator shafts ran.