To exempt certain buildings from the requirements for a fire-resistance rating of floor, wall, ceiling and roof assemblies in Articles 3.2.2.78. to 3.2.2.84. if measures are taken to limit the probability that combustible construction materials within a storey of a building will be involved in a fire, which could lead to the growth of fire, which could lead to the spread of fire within the storey during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to harm to persons.