Ontario Building Code Practice Exam

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

1. Labeled with a fire rating

2. Non-combustible materials

3. Continuous from floor to underside of roof sheathing

4. Minimum thickness of 50 mm

The correct answer is: Minimum thickness of 50 mm

A Labeled with a fire rating is a requirement for a fire-rated column assembly in a commercial building, as it allows for easy identification and verification of the fire resistance capabilities of the column. B: Non-combustible materials is also a requirement, as combustible materials can contribute to the spread of fire. C: Continuous from floor to underside of roof sheathing is another requirement, as any gaps or breaks in the column assembly can compromise its ability to resist fire. Overall, the main reason why D is not a requirement is that there is no set minimum thickness required for a fire-rated column assembly. The relevant factors are the materials used and their performance in fire tests, not just their thickness.