1804 HEWITT AVE 2022-05-12 - Laserfiche WebLink

• • NEW HEWITT/HODGES ASSOCIATES,LLC Page 10 �I HODGES BUILDING—ELEVATOR HOISTWAY ALTERATION January 1 , 017 Review of Fire-Resistive Construction Provisions Limited new wall construction of the stairs or corridors is anticipated, and may generally consist of patching of existing walls. Such maintenance or repair work should be permissible in accordance with IBC Sections 3401.4.1 and 3401.4.2 without necessitating compliance with Section 1207.2. In accordance with IBC Section 716.5.3, unit doors opening into the corridor should be limited to 20-minute FRR opening protection with S-labels.As provided for in Exception 1 of this section, viewports are permitted in such corridor doors which should contribute to occupant safety and security. If the existing cross-corridor separation is retained together with the installation of doors at the upper stair landing of every level, the cross-corridor doors should minimally satisfy the provisions of IBC Section 710.5.2 for a smoke partition. Practical There are 12 units which exit directly into the existing atrium environment of the helical stair shaft enclosure. If this vertical shaft were untenable for egress, occupants of the 12 units served could be trapped without access to a second exit. In such case,the only exit from each floor available to occupants of the other units is the fire escape. Providing FRR separation at every floor, as appears consistent with the original design configuration of the building, would offer all 9 units per floor access to 2 exits from the floor which are remotely located at opposite ends of the corridor. This arrangement is consistent with modern code provisions. Even if the entire corridor were untenable, occupants of only 9 units would be trapped without access to an exit(compared to the 12 units as described above with the helical stair enclosure). With FRR separation at every floor, the interior stair may be untenable only at the fire floor. In such case, occupants below the fire floor could still exit via the interior stair. Occupants on floors above the fire could also initially descend via the interior stair. Upon reaching the corridor at the level above the fire floor, occupants could then travel to the other end of the corridor and exit via the fire escape. CONCLUSION While it may be permissible for the existing arrangement to be maintained, restoration of the apparent original building design configuration represents a superior level of fire protection and life safety to that currently provided. In accordance with IBC Section 3401.2 and IFC Sections 703.2 and 1103.1, opening protection should be restored at the upper stair landing at each floor, consistent with the apparent original building design configuration. This door should be installed in a 1-hour fire barrier wall assembly and satisfy provisions applicable to both corridor and interior exit stairway door assemblies. Applicable accessibility provisions, including IBC Section 3411, should also be considered. AEGIS Engineering,PLLC