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Question Regarding Plan Structural Irregularities (Table 16-M)

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Does a Type 3 Diaphragm discontinuity irregularity apply to a 2-story
tilt-up building with a rigid second floor diaphragm and a flexible,
panelized roof diaphragm? Obviously, the stiffness of these two
diaphragms differs by more than 50%, but the Code states the
irregularity applies "from one story to the next." Does provision intend
to include the roof diaphragm? I ask since in Table 16-L-2., Weight
(mass) irregularities, the Code excepts roofs lighter than the floor
below. It seems that the same argument may apply to 16-M-3. Any


Ben Maxwell, P.E.