I read the WTC construction manual. It was 4 inch of light weigth concrete no skim was talked about. Each floor was 4 inches thick period of light weight cement. THe trussel was close togther to make up for this lightweight desgin and to have large open spaces in the building. That was the first time that desgin was used in a very tall bulding.
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Originally Posted by scalziand
That was just a skim coat over the steel trusses and decking that comprised the floor. It's not like that slab was the entire structure of the floor.
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