Ontario Building Code Practice Exam

Which of the following is not a requirement for a fire-rated column assembly in a residential building?

1. Labeled with a fire rating

2. Non-combustible materials

3. Continuous from floor to underside of roof sheathing

4. Minimum thickness of 75 mm

The correct answer is: Minimum thickness of 75 mm

One possible explanation A fire-rated column assembly is designed to resist and contain the spread of fire within a building. It is important to ensure that all components of the assembly meet certain requirements to effectively perform this function. Option A is incorrect because a fire-rated column assembly must be clearly labeled with a fire rating to indicate its ability to withstand fire. This is necessary for building inspectors to verify compliance and for occupants to be aware of the level of fire protection provided. Option B is incorrect as non-combustible materials, such as steel, are required for fire-rated column assemblies. Combustible materials, such as wood, can contribute to the spread of fire and are not suitable for this purpose. Option C is incorrect because a fire-rated column assembly must be continuous from the floor to the underside of the roof sheathing. Any gaps or breaks in the assembly can allow fire and smoke to spread, compromising its effectiveness. The correct answer is option D because there is no minimum thickness requirement for a fire-rated column assembly. However, the materials used in the assembly must have the necessary fire-resistance properties to meet building code regulations. Simply having a minimum thickness does not guarantee fire resistance. In summary, the correct answer is not a requirement for