713.4 Fire-resistance rating.
BC § 713.4
Shaft enclosures shall have a fire-resistance rating of not less than 2 hours where penetrating three stories or more, and not less than 1 hour where penetrating fewer than three stories. The number of stories connected by the shaft enclosure shall include any basements or cellars, but not any mezzanines. Shaft enclosures shall have a fire-resistance rating not less than the floor assembly penetrated, but need not exceed 2 hours. Shaft enclosures shall meet the requirements of Section 703.2.1.













