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This help desk is a free resource intended for discussion purposes only. Neither BOMA, its chapters, affiliates, or Extreme Measures Inc.® are responsible for the information, comments or opinions expressed herein. For complete information, refer to the official publications of the standards themselves.

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Base Building Corridors on Ground floors

Brett Butler
November 15, 2013

BBC is the minimum path to access to and egress from: (as per definition)....
On Ground floors, the main and auxiliary lobbies are BSA. In the scenario where the building core is at the main entrance, the Occupant Area is a large open area behind and there are multiple emergency exit doors, should the BBC extend to these exits?


David Fingret
Extreme Measures Inc.
November 15, 2013

It would be helpful to see a plan, but building exits (egress corridors) should be Building Service Area.

David Fingret
Extreme Measures Inc.
November 18, 2013

I reviewed the plans you sent. They look very similar to Illustration 12.1 of the BOMA 2010 manual (Method B). The illustration clearly shows that exterior exits within ground floor occupant areas are included as Occupant Area. Base Building Circulation should not extend to the emergency / exterior exits.

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