Ontario Building Code Practice Exam

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Which of the following is not a requirement for a fire-rated floor-ceiling assembly in a commercial building?

Non-combustible materials
Labeled with a fire rating
Continuous from wall to wall
Minimum thickness of 100 mm

The correct answer is: Minimum thickness of 100 mm

A fire-rated floor-ceiling assembly is a necessary component for maintaining the structural integrity and safety of a commercial building in the event of a fire. Non-combustible materials, such as concrete or steel, are an important requirement as they do not contribute to the spread of fire. A fire rating label indicates that the assembly has been tested and certified to withstand a certain level of fire resistance. Continuous coverage from wall to wall ensures that there are no gaps or weak spots in the assembly. Option D, a minimum thickness of 100 mm, is not a requirement for a fire-rated floor-ceiling assembly. However, thickness can play a role in a building's fire resistance as thicker materials typically have a longer burn time and provide more protection. This may be why option D may seem like a possible requirement, but it is not necessary for an assembly to have a specific minimum thickness to meet fire safety standards.