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

  1. Non-combustible materials

  2. Labeled with a fire rating

  3. Continuous from wall to wall

  4. Minimum thickness of 50 mm

The correct answer is: Minimum thickness of 50 mm

A fire-rated floor assembly in a high-rise building must have non-combustible materials, be labeled with a fire rating, and be continuous from wall to wall. A minimum thickness of 50 mm is not a requirement for a fire-rated floor assembly in a high-rise building. This is because there are different types of materials and designs that can achieve the necessary fire resistance without a specific thickness requirement. Therefore, option D is not a correct requirement.