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2015 IBC CORRIDORS 1020.1, Exception 4 applicable?

sergoodo

Sawhorse
Joined
Oct 27, 2009
Messages
263
IF all doors were closed, what is the occupant load of the floor. If one exit is blocked, how many people would be using the corridor to access the second exit??

Regardless of whether doors or open or closed: Occupancy of the floor is 40 with 2 exits. The loss of one exit: 40 occupants means of egress will be a corridor sized for 20 occupants according to 1005.5.
 

Builder Bob

Sawhorse
Joined
Oct 17, 2009
Messages
2,370
Location
Sunny SC - Coastal (not Charleston or Myrtle Beach
IN an NFPA fire plans examiner class, we were taught that the occupant load for a floor determined the occupant load for the corridor........ Not what entered the corridor but what the occupant load of the floor was... as is one door was blocked and required all parties to use second exit.

Otherwise I could keep adding doors inside the corridor to ensure that no part of the corridor itself served more than 30 people.......

1601342073241.png
 

sergoodo

Sawhorse
Joined
Oct 27, 2009
Messages
263
No you can’t just add doors , the occupancy reduction is limited to not more than 50%. Plus if adding doors does not effect occupancy unless you are adding exit access or exit doors.
The unrated corridor with a capacity of 20 complies. You cannot just ignore 1005.5
 

sergoodo

Sawhorse
Joined
Oct 27, 2009
Messages
263
The question: When is 1020.1, exception 4 not applicable in a B occupancy space with 40 occupants?
 
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