1804 HEWITT AVE 2022-05-12 - Laserfiche WebLink

• NEW HEWITT/HODGES ASSOCIATES, LLC e 9 t} HODGES BUILDING—ELEVATOR HOISTWAY ALTERATION January 12, 2017 Review of Fire-Resistive Construction Provisions CONSIDERATION If the 4-story open helical stair shaft atrium condition were part of the existing original building design, it should be permitted to remain as the relative hazard is unchanged with the enlargement of the hoistway.Therefore, it is reasonable to consider the new construction to be such that the existing building will be no less compliant with the provisions of the code than it was prior to the work; consistent with the language of IBC Section 3404.1 for alterations, presented above. However,the original building design appears to have involved doors at the top landing of each stair at every floor. Based on a strict interpretation of IFC Sections 703.2 and 1103.1, opening protection should continue to be present at the top stair landing of each floor. Such an arrangement would help contain smoke and fire to a single floor and limit vertical smoke migration through the building, consistent with general building fire safety strategies. We have been unable to confirm that the uninterrupted helical stair shaft atrium condition was created by a previous building alteration which installed a wall and cross-corridor door and removed the doors from the stair landing at every floor. Incidentally, with the interconnection of 4 or more stories,the presence of 90-minute labels on unit doors corresponds to the 2-hour FRR construction as would be prescribed by modern codes. Technical Restoring the presence of a door in the existing doorways on Levels 2 through 5 to the residential corridor at the top landing of each flight of stairs should be consistent with IBC Section 3401.2, to maintain existing devices or safeguards in accordance with the code edition under which it was installed. Such new doors should be self-or automatic-closing and swing into the stair in the direction of egress travel. Minimum 60-minute FRR opening protection with S-labels should be provided per IBC Sections 716.5.3, 716.5.5 and Table 716.5. This arrangement should address the following IBC provisions, reference section(s)shown in parenthesis: A. Atrium smoke control not applicable (404.5) B. 1-hour FRR construction (602.4.6, 713.4 and 716.5) C. Corridor open to a single floor(712.1.8) D. Door swings in direction of egress travel (1008.1.2) E. Limited corridor dead-end length (1018.4) F. Corridor continuity(1018.6) G. Units provided with access to two exits (1021.2) H. Elevator opens into corridor(1022.4) I. Elevator not within stairway enclosure (3002.7) Maintaining a 1-hour fire barrier with this stair element is consistent with the level of protection prescribed in the IBC for maintenance of a 1-hour horizontal assembly. AEGIS Engineering, PLLC