Ontario Building Code Practice Exam

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

1. Non-combustible materials

2. Labeled with a fire rating

3. Continuous from wall to wall

4. Minimum thickness of 50 mm

The correct answer is: Minimum thickness of 50 mm

A Non-combustible materials are a requirement for a fire-rated floor-ceiling assembly as they help to prevent the spread of fire. B: Being labeled with a fire rating is a requirement as it allows for easy identification and ensures the fire-resistance of the assembly is known and consistent. C: Being continuous from wall to wall is also a requirement as it prevents any gaps that could allow fire to spread. 50mm minimum thickness is not a requirement for a fire-rated floor-ceiling assembly in a commercial building. However, the thickness may vary depending on the specific fire rating required for the assembly. In general, the thicker the assembly, the higher the fire rating it can achieve. Therefore, while 50mm may not be a requirement, it is often necessary to achieve a desired fire rating.