BY ROGER G. MORSEI investigated the fireproofing in both World Trade Center towers over approximately a 10-year period between the early 1990s and early June 2000, the last time I was in the towers. There were problems with the fireproofing in the World Trade Towers that may have rendered them vulnerable to fire. These problems are not unique to the WTC; I have observed similar problems with the fireproofing in many high-rise buildings in the United States and Europe. FIREPROOFING TYPES(Editor's note: "Fireproofing" is the name commonly given to fire-resistive coatings applied to structural steel components of high-rise buildings to protect them from the heat of a fire. Fireproofing i...