To limit the probability that using inappropriate design pressures will lead to the walls being unable to resist expected lateral pressure, which could lead to the cracking of foundations or building superstructures.
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 of floors, which could lead to negative effects on the psychological well-being of persons.
To expand the application of Section 4.2. to walls supporting drained earth that are not constructed in accordance with Section 9.15.