Ontario Building Code Practice Exam

In the context of fire-rated floor-ceiling assemblies in commercial buildings, a minimum thickness requirement of 50 mm is not universally mandated by the Ontario Building Code. Fire-rated assemblies focus more on the performance characteristics needed to properly contain fire and prevent its spread, rather than specifying a standard thickness.

The other options detail essential criteria for such assemblies. Utilizing non-combustible materials ensures that components do not contribute to the fire's intensity. Having the assembly labeled with a fire rating confirms its tested performance according to standards, allowing for verification of its fire-resistive capabilities. The continuous nature from wall to wall is crucial because gaps or discontinuities can compromise the integrity of the assembly, allowing smoke and flames to breach compartments. Thus, while thickness can play a role in fire resistance, the code does not stipulate an exact measurement like 50 mm as a definitive requirement for all scenarios.