Public corridors and stairways serving ten (10) or more people in buildings shall be of one hour fire resistive construction with solid wood doors not less than one and three-quarter inches thick. Existing frames need not have a fire resistive time period.
When the existing frame will not accommodate the one and three-quarter inch thick door, a one and three-eighths inch thick solid bonded wood core door or equivalent insulated steel door may be permitted. Door closers are required. Gas-keting shall be required around corridor doors. Stairway enclosures shall be installed in accordance with R1 occupancy requirements of Chapter 33 of the Uniform Building Code. (Prior code § 9.29.1321)