NIST akawana kuti fireproofing pamusoro shongwe'simbi kwezvivako yakanga ichiputika nokuda kwokutanga kukanganiswa ndege uye kuti, kana izvi hazvina kuitika, shongwe vangadai vakaramba vakamira. A kudzidza kuchamhembe shongwe's kuwa yakabudiswa nevatsvakurudzi Purdue kubva 2007, vakaona kuti ndege akanga achibvisa kupisa insulation pamusoro simbi mamiriro, izvo kunze moto dziviriro matanho akanga panzvimbo, uye akaongorora sei moto dziviriro hurongwa aigona kunatsiridzwa mune ramangwana kuvakwa. Kuongorora pamusoro kuwa 1 WTC uye 2 WTC yakapera muna October 2005 uye kuti 7 WTC yakapera muna August 2008. NIST akawana kuti fireproofing pamusoro shongwe'simbi kwezvivako yakanga ichiputika kure nokuda kwokutanga kukanganiswa ndege uye kuti, izvi zvisina kuitika, shongwe vangadai vakaramba vakamira.
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