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Where the work area on any floor exceeds 50 percent of that floor area, stairways that are part of the means of egress serving the work area shall, at a minimum, be enclosed with smoketight construction on the highest work area floor and all floors below.
Exception: Where stairway enclosure is not required by the International Building Code or the International Fire Code.

Related Code Sections

1203.6 Historic Buildings, Stairway Enclosure
In buildings of three stories or less, exit enclosure construction shall limit the spread of smoke by the use of tight-fitting doors and solid ...
1203.6 Historic Buildings, Stairway Enclosure
In buildings of three stories or less, exit enclosure construction shall limit the spread of smoke by the use of tight-fitting doors and solid ...