Allowable Story Drift, ? a (in. or mm)
0.025 hsx b
Structures, other than masonry shear wall or masonry
wall frame structures, four stories or less in height
with interior walls, partitions, ceilings, and exterior
wall systems that have been designed to accommodate
the story drifts
Masonry cantilever shear wall structures c
Other masonry shear wall structures
Masonry wall frame structures
All other structures
hsx is the story height below Level x.
There shall be no drift limit for single-story structures with interior walls, partitions, ceilings, and exterior
wall systems that have been designed to accommodate the story drifts.
Structures in which the basic structural system consists of masonry shear walls designed as vertical
elements cantilevered from their base or foundation support which are so constructed that moment transfer
between shear walls (coupling) is negligible.