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In the context of fire-rated floor-ceiling assemblies in residential buildings, the requirement regarding the minimum thickness of 100 mm is not universally applicable. The Ontario Building Code specifies that fire-rated assemblies must meet certain standards, but the thickness can vary based on the materials and the specific assembly design rather than a one-size-fits-all dimensional requirement.

For a fire-rated assembly, the other criteria focus on safety and compliance with fire protection standards. Non-combustible materials are required to minimize the spread of fire and ensure structural integrity during a fire event. Labeling with a fire rating is essential for identification and compliance verification, allowing inspectors and builders to ensure that the assembly meets prescribed fire-resistance standards. Continuous installations from wall to wall help eliminate gaps that could serve as openings for fire and smoke to travel, thus enhancing the effectiveness of the fire-rated assembly.

By contrast, the thickness of a floor-ceiling assembly can be influenced by other factors such as the overall structural design and the materials being utilized, meaning that a specific thickness like 100 mm is not a concrete requirement for all assemblies.