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

  1. Labeled with a fire rating

  2. Non-combustible materials

  3. Continuous from floor to underside of roof sheathing

  4. Minimum thickness of 75 mm

The correct answer is: Minimum thickness of 75 mm

A fire-rated beam assembly in a residential building must be labeled with a fire rating, constructed with non-combustible materials, and be continuous from floor to underside of roof sheathing. The minimum thickness of 75 mm is not a requirement as there is no specific thickness required for fire-rated beam assemblies.