Ontario Building Code Practice Exam

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

1. Non-combustible materials

2. Minimum thickness of 50 mm

3. Labeled with a fire rating

4. Continuous from wall to wall

The correct answer is: Minimum thickness of 50 mm

A Non-combustible materials are a requirement for a fire-rated floor-ceiling assembly in a residential building in order to prevent the spread of fire between floors. C: The assembly must be labeled with a fire rating to ensure that it has been properly tested and meets safety standards. D: The assembly must be continuous from wall to wall in order to prevent fire from spreading through gaps or openings. B: While it may seem like a thicker floor-ceiling assembly would provide better fire protection, the specific thickness requirement is determined by building codes and standards and may vary depending on the type of construction. Therefore, a minimum thickness of 50 mm is not a universal requirement for all fire-rated floor-ceiling assemblies in residential buildings.