Ontario Building Code Practice Exam

Which of the following is not required for a fire-rated floor-ceiling assembly in a high-rise building?

1. Non-combustible materials

2. Labeled with a fire rating

3. Continuous from wall to wall

4. Minimum thickness of 100 mm

The correct answer is: Minimum thickness of 100 mm

Fire-rated floor-ceiling assemblies in high-rise buildings require non-combustible materials, a fire rating label, and a continuous structure from wall to wall to provide adequate protection against spreading fire. A minimum thickness of 100 mm is not required and would not provide any functional benefit in preventing fire.