Ontario Building Code Practice Exam

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

1. Non-combustible materials

2. Labeled with a fire rating

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 Non-combustible materials are a requirement for a fire-rated wall assembly in a commercial building, as they are less likely to contribute to the spread of fire. B: An accurate fire rating is a key requirement for a fire-rated wall assembly, as it ensures that the wall can withstand the specified amount of time during a fire. C: The wall assembly must be continuous from the floor to the underside of the roof sheathing in order to prevent fire from spreading to other areas of the building. Option D is incorrect because the minimum thickness of a fire-rated wall assembly is typically determined by the specific fire rating required for the building, not a universal minimum thickness of 50 mm. The thickness may vary depending on factors such as building materials and fire safety regulations.