1804 HEWITT AVE 2022-05-12 - Laserfiche WebLink

• • • NEW HEWITT/HODGES ASSOCIATES,LLC Page 71/— HODGES BUILDING—ELEVATOR HOISTWAY ALTERATION January 1 , f7 Review of Fire-Resistive Construction Provisions should at least conform to the FRR for the enclosure of the stairway serving the upper building levels. The penetrations of the existing basement stair wall should be protected in accordance with IFC Section 703.1. This provision prescribes openings be, "protected with approved methods capable of resisting the passage of smoke and fire."As this provision does not prescribe use of a tested or listed system, materials acceptable in IBC Section 718.3.1 for draftstopping may suffice,subject to approval of the Authority Having Jurisdiction (AHJ). CONCLUSION In accordance with the provisions of IBC Sections 3404.1 and 1027.1, new walls enclosing the basement stair must at least be constructed as 1-hour fire barriers. The existing configuration with a door separating the two levels should be maintained; the door should be minimum 60-minute rated. • Penetrations and holes in the wall of the stair enclosure should be protected in accordance with IFC Section 703.1 as required for an existing fire-resistance-rated wall assembly. Subject to approval by the AHJ, protection could range from simply filling the annular space around a penetrant with draftstopping material(e.g. mineral wool per IBC Section 718.3.1) to obtaining a formal engineering judgment from a firestopping manufacturer for each condition. Where no minimum FRR is required, protection achieving'a"cold smoke seal" should be sufficient. STAIR TO LEVEL 2 The stair from the main level up to Level 2 is being altered with the enlargement of the elevator hoistway. OBSERVATIONS While no door was present, this stair appears to have been originally designed with a door at Level 2. This stair is open to the main building lobby space. CONSIDERATION Provisions of IBC Section 1027.1 provides for exceptions to discharging directly to the exterior of the building. One exit serving the upper levels is an existing exterior fire escape, as permitted in accordance with IBC Section 3406.1.2. The subject interior stairway is the second exit from the upper building levels. Similar to the allowance in IBC Section 1027.1, one of these two exits (the interior stairway)discharges through the building, which anticipates separation between the stair enclosure and level of discharge. AEGIS Engineering,PLLC