brian carroll wrote:
right, 3 (or however many) layers of gypsum board was not enough to prevent the plane (or an explosion) from piercing the stairwell. why the possibility of an explosion taking place outside the stairwell was not considered in the design, i don't know.
in my previous life, i designed residential bomb shelters with 40 cm (16") thick walls of solid reinforced concrete and doors of 6" solid plate steel.
(yes, though i thought the newspaper stated
that it was related to thickness of the
gypsum used in the fireproofing of stairs.)
right, 3 (or however many) layers of gypsum board was not enough to prevent the plane (or an explosion) from piercing the stairwell. why the possibility of an explosion taking place outside the stairwell was not considered in the design, i don't know.
in my previous life, i designed residential bomb shelters with 40 cm (16") thick walls of solid reinforced concrete and doors of 6" solid plate steel.