Commercial Building Inspector B2General Administration, Permits, and PlansHard
A commercial building inspector is reviewing plans for a new 5-story Group R-1 hotel with an atrium. The atrium connects all five stories. What is the minimum vertical separation distance required between openings in the atrium enclosure through which a communicating space enters the atrium and other such openings in the enclosure?
- A5 feet
- B10 feet
- C0 feet
- D15 feet
Show answer & explanationAnswer & explanation
Correct answer: A. 5 feet
IBC Section 404.6.2 specifies that communicating spaces, such as rooms, suites, or tenant spaces, are permitted to open directly into an atrium. However, such communicating spaces are required to be separated from the atrium by a minimum of 5 feet vertically from other communicating spaces.
Why the other options are wrong
- B. 10 feet is sometimes a requirement for other vertical separations or projections, but not for communicating spaces into an atrium.
- C. 0 feet would allow direct vertical stacking of communicating spaces without separation, which is not permitted for fire and smoke control.
- D. 15 feet is not a standard vertical separation requirement for this specific atrium condition.
Atrium Communicating Space Vertical Separation
Openings for communicating spaces into an atrium must maintain a minimum 5-foot vertical separation from other such openings in the atrium enclosure, to mitigate fire and smoke spread.
- Atriums connect multiple stories.
- Communicating spaces are rooms/suites opening into atrium.
- Vertical separation helps compartmentalization.
Memory trick: Atrium spaces need five feet between them, like steps on an open staircase.