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CFAA Fire Alarm Technician · Question

In a room with solid joist construction, what is the required spacing reduction for heat detectors at right angles to the joists?

For a ceiling with solid joists, S524 requires the spacing of heat detectors at right angles to the joists to be 50% of the smooth ceiling spacing (0.5S).

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Question: In a room with solid joist construction, what is the required spacing reduction for heat detectors at right angles to the joists?

Answer options:

  • 0.25S
  • 0.33S ✅ 0.50S
  • 0.75S

Correct answer: 0.50S

Explanation: For a ceiling with solid joists, S524 requires the spacing of heat detectors at right angles to the joists to be 50% of the smooth ceiling spacing (0.5S).

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