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 50 mm

The correct answer is: Minimum thickness of 50 mm

A fire-rated column assembly in a residential building must meet specific requirements in order to slow or prevent the spread of fire. A minimum thickness of 50 mm is not one of these requirements. Option A is a common requirement, as fire-rated columns should be labeled with their specific fire rating to ensure they are installed correctly and meet safety standards. Option B is also important, as non-combustible materials are necessary to prevent fire from spreading through the column itself. Finally, option C is necessary for the assembly to effectively contain the fire and prevent it from reaching other areas of the building. Therefore, D is the only incorrect option as it is not a requirement for a fire-rated column assembly in a residential building.