Intent 1:
To limit the probability of excessively long spans,
which could lead to inadequate strength to support the additional
weight of a concrete topping, which could lead to excessive deflection
or failure. 
This is to limit the probability
of: 
- compromised structural integrity, 
- for environmental separator or elements supporting an
environmental separator, the failure of required environmental separation
elements, which could lead to deterioration, or 
- an inability to resist expected loads, which could lead
to - the excessive deflection or vibration of floors, or
- the excessive movement or deformation of walls. 
 
This is to limit the probability of: 
- compromised operation of doors or windows required for
egress in an emergency, and
- persons losing their balance, tripping or falling.
This is to limit the probability of harm to persons.