To limit the probability of overloading cantilevered floor joists, which could lead to excessive bending moments, which could lead to an inability to resist expected roof loads, which could lead to the excessive movement, deformation or failure of floor or roof assemblies.
This is to limit the probability of:
This is to limit the probability of excessive movement, vibration or deflection of floors, which could lead to negative effects on the psychological well-being of persons.