Ontario Building Code Practice Exam

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

  1. Non-combustible materials

  2. Labeled with a fire rating

  3. Continuous from floor to underside of roof sheathing

  4. Minimum thickness of 100 mm

The correct answer is: Minimum thickness of 100 mm

A fire-rated floor-ceiling assembly in a high-rise building requires non-combustible materials, a fire rating label, and continuous construction from the floor to the underside of the roof sheathing. However, a minimum thickness of 100 mm is not a requirement. This is because the thickness of the assembly may vary depending on the type of materials used and the specific fire rating needed for the building. In general, the higher the fire rating, the thicker the assembly will need to be. Therefore, D is the one requirement that is not a standard for all fire-rated floor-ceiling assemblies in high-rise buildings.

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