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

  1. Non-combustible materials

  2. Labeled with a fire rating

  3. Continuous from wall to wall

  4. Minimum thickness of 75 mm

The correct answer is: Minimum thickness of 75 mm

A requirement for a fire-rated floor-ceiling assembly in an industrial building is to have a minimum thickness of 75 mm. Non-combustible materials, a fire rating label, and being continuous from wall to wall are all necessary components of a fire-rated assembly. Therefore, option D is not a requirement.