According to the IBC, what is the maximum dead-end corridor length allowed in a non-sprinklered business occupancy?
Correct Answer
B) 20 feet
IBC Section 1020.4 limits dead-end corridors to 20 feet in non-sprinklered buildings and 50 feet in sprinklered buildings.
Why This Is the Correct Answer
IBC Section 1020.4 explicitly limits dead-end corridors to 20 feet in non-sprinklered buildings. This strict limit exists because a dead-end forces occupants to reverse direction if blocked by fire or smoke, increasing evacuation risk. The shorter limit in non-sprinklered buildings accounts for the faster spread of smoke and fire without suppression.
Why the Other Options Are Wrong
Option A: 40 feet
40 feet is not permitted in a non-sprinklered business occupancy. This value exceeds the code limit and would leave occupants dangerously exposed in a fire. It is sometimes confused with other travel distance thresholds in the IBC.
Option C: 30 feet
30 feet is not a recognized dead-end limit under IBC Section 1020.4. It falls between the two actual thresholds (20 ft non-sprinklered / 50 ft sprinklered) and is a plausible-sounding distractor.
Option D: 50 feet
50 feet is the maximum dead-end corridor length permitted in a sprinklered building, not a non-sprinklered one. Confusing the sprinklered and non-sprinklered values is the most common error on this question.
Memory Technique
Think '2-0 = no-go (no sprinklers)': a non-sprinklered dead-end stops at 20 feet. The '5' in 50 rhymes with 'alive' — sprinklers keep you alive longer, so you get 50 feet.
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