3405 ROCKEFELLER AVE A, B, C 2025-04-17

require fire-rated construction. Details referencing listed and tested assemblies should be included in the drawings. The extend of all assemblies should be clearly indicated. 9. All air ducts penetrating the horizontal assembly are required to have radiation dampers. Note that the kitchen hood cannot have a damper and must vent directly through the wall. 10. Continuing with the previous comment, the basement laundry room serves more than one unit and is isolated appropriately for fire protection. However, the laundry requires ventilation ducting to travel to the building exterior. The path of the ducts needs to be shown. The ducts need to be located in rated enclosures or provided with radiation dampers. Note that radiation dampers cannot be used for dryer exhaust. See IBC Section 717. 11. All smoke detectors in each unit should be interconnected, hardwired, and provided with back-up battery power. 12. The A/3 unit requires a smoke/CO detector outside the bedroom door. The detector should be located close to the bedroom door but as far from the bathroom door as possible. 13. The A/1 and A/2 unit upper bedrooms should have the smoke/CO detector located directly outside the bedrooms, not on the other side of another door. The detectors should be located as far from the bathroom doors as possible. 14. The horizontal and vertical assemblies require sound rating per IBC Section 1206. 15. The wall and ceiling cavities are required to be insulated per WSEC Section R503.1.1. 16. The roof may require ventilation. Additional detailing should be provided as needed. 17. The window well system should be specified. Note that the well appears to span 14 feet. It is not clear that a prefabricated system is available that complies with the proposed design. Additional information should be provided for the performance requirements (e.g., maximum depth, etc.). A revised design (e.g., concrete retaining wall, etc.) may be required. The depth of the grade below the windows should also be specified; the grade should provide the minimum clearance per IBC Section 2304.12. 18. The landing at the bottom of the north stairway for Unit A/2 does not appear code compliant. It should be at least 3-feet long in the direction of travel. It is understood that the locations of walls are believed to be existing. This condition should be verified. If existing, it is recommended that this non- conforming condition be mitigated if possible. 19. The following should be addressed for the reconstruction of the west wall a. Calculations substantiating the design should be submitted for review. b. The beams and columns do not appear to be adequately reinforced per ACI 318-14. Notably, these elements to not include confining and shear reinforcement. The beams appear to potentially support overturning loads from the shear walls above. Overturning loads must be considered from wall segment ends regardless of whether the walls themselves are adequately designed and detailed for lateral loads. c. The out-of-plane performance of the retaining wall is not clear. The column elements do not appear adequate to span to the floor above and support the top of the wall (i.e., below the windows) against rotation. The wall should be redesigned as a gravity wall, or calculations substantiating the design of the columns to resist flexural out-of-plane loading concurrent with in-plane and axial forces should be submitted for review. d. The design of the footings appears to be incomplete, including but not limited to missing dimensions. 20. A schedule of special inspections is required per IBC Chapter 17. Review of your project will be performed in the order received once the required documentation has been submitted. Please let me know if you have questions. 2