To limit the probability of inadequate load distribution among the wythes of masonry-bonded, multiple-wythe walls, which could lead to an inability to resist transverse or vertical loads, which could lead to cracking or buckling.
This is to limit the probability of:
For floors and elements supporting floors, this is to limit the probability of excessive movement, deflection or vibration, which could lead to negative effects on the psychological well-being of persons.