2130 E 17th St - Plan - Laserfiche WebLink

Home Browse Search

ESR-1308 | Most Widely Accepted and Trusted Page 5 of 21 molding on two adjacent walls (attached walls). The center of the rivet must be 0.25 inch (6.35 mm) from the edge of the wall angle. See Figures 2 and 3. 4.5 Lighting Fixtures: Lighting fixtures must be installed in accordance with Section 13.5.6 of ASCE 7-16 and ASCE 7-10. Lighting fixtures may also be attached to the grid with clips complying with the ICC-ES Acceptance Criteria for Attachment Devices for Recessed Lighting Fixtures (Luminaires) in Suspended Ceiling Systems (AC184). The lighting fixtures may also be attached to the framing members with sheet metal screws having a minimum allowable shear strength of 314 lbf (1395 N) and minimum allowable tension strength of 137 lbf (609.6 N) for a No. 20/20 gage metal-to-metal connection. 4.6 Partitions: Partitions must be laterally supported as required by Section 13.5.8 of ASCE 7, as referenced by the applicable IBC Section 1613. 4.7 Two-hour Fire-resistance-rated Floor-ceiling Assembly: The floor-ceiling assembly described in Section 4.7 has a two-hour fire-resistance rating (refer to Figure 7 for details): 4.7.1 Structural Beams: The structural floor beams supporting the floor-ceiling assembly are minimum W8×15, or an equivalent-sized steel beam having a minimum weight-to-heated-perimeter ratio, W/D, of 0.54. In accordance with Section 704.3 of the 2015, 2012, and 2009 IBC, structural steel floor beams need not be individually fire-protected when the suspended ceiling forms the protective membrane for the fire-resistance-rated assembly. However, structural floor beams must be individually protected on all sides for the full length with materials having the required fire-resistance rating, when they support directly applied loads from a floor and roof or more than one floor, or where the required fire-resistance rating of such members is greater than two hours. 4.7.2 Floor Joists: Floor joists are minimum 10K1 steel bar joists, spaced a maximum of 24 inches (610 mm) on center. Each joist must be welded to end supports, and must have 1/2-inch-diameter (12.7 mm) steel bar bridging members welded to top and bottom chords of each joist at midspan. 4.7.3 Steel-floor Decking: The concrete deck is either supported by minimum No. 22 gage [0.0299 inch (0.759 mm)] galvanized steel deck panels with 119/32-inch- deep (32.5 mm) flutes spaced 6 inches (152 mm) on center, or is supported by minimum No. 20 gage [0.0359 inch (0.91 mm)] galvanized steel cellular panels having 3-inch-deep (76 mm) flutes. When a blend of fluted and cellular steel deck panels is used, the concrete topping thickness is measured from the top plane of the cellular deck panels. The steel deck panels must be welded to supports at 12 inches (305 mm) on center. Adjacent deck panels must be button-punched or welded together at 36 inches (914 mm) on center at side joints. Where fluted and cellular floor deck panels are installed end-to-end, galvanized steel angles must be tack-welded to the cellular floor deck panels in such a manner as to cover the cells. 4.7.4 Concrete Floor: The concrete floor must be a minimum of 21/2 inches (63.5 mm) thick, measured from the top of the metal deck panels, and normal-weight concrete with carbonate or siliceous aggregates. The concrete must have a minimum density of 150 ± 3 pcf (2400 ± 48 kg/m3), and a minimum compressive strength of 3,000 psi (20.7 MPa). The middle of the slab must be reinforced with 6×6–W1.4×W1.4 welded wire fabric. 4.7.5 Suspended Ceiling Members: 4.7.5.1 Main Runners: Main runners are either the 8300, 8301 or HD 8201. The main runners are 12 feet (3657.6 mm) long and spaced a maximum of 4 feet (1219.2 mm) on center. The design loads for main runners must be less than or equal to the capacities shown in Table 2. Vertical hangers, perimeter hangers, and lateral-force bracing for the main runners are installed in accordance with the code. The distance from the bottom side of the floor decking to the bottom side of the main runners is a minimum of 193/4 inches (502 mm). 4.7.5.2 Cross Runners: Cross runners are either the XL 8200 series (Prelude Plus Fire Guard) or XL 8300 series (Prelude Fire Guard). Main runners must be located within 1/32 inch (0.79 mm) of the required center distances, and this tolerance must be noncumulative beyond 12 feet (3657.6 mm). Intersecting runners must be installed to form a right angle to the supporting members. The design loads for cross runners must be less than or equal to the capacities shown in Table 3. A cross runner that supports another cross member must have a minimum uniformly distributed load capacity of 12 pounds per linear foot (175 N/m). 4.7.5.3 Hanger Wire: The suspended ceiling is supported by No. 12 SWG [0.105 inch (2.7 mm) in diameter] galvanized steel wire that is attached to the concrete slab through the steel floor units, before concrete placement, or attached to hanger clips. The hanger clips are minimum 0.045-inch-thick (1.14 mm), 2-inch-wide (51 mm), 31/2-inch- long (90 mm), galvanized steel clips that are hooked at one end, for attachment over the male leg of steel floor units, and spaced as required for hanger wire attachment. Hanger wires are spaced a maximum of 48 inches (1219 mm) on center or must be located at every other main runner/cross-tee intersection, whichever dimension is less along main runners. Hanger wire must be located at all four corners of light fixtures, at mid-span of cross tees next to 4- and 5-foot-long (1219 and 1524 mm) light fixtures and air duct outlets, and next to each main runner splice. Additional hanger wires are required at the mid-span of those cross tees running parallel and nearest to the walls and those near the end of cut cross tees longer than 2 feet (610 mm) that abut walls. 4.7.6 Acoustical Material: Acoustical lay-in ceiling panels used with the suspended ceiling system are the nominal panel sizes and types shown in Table 1. Panels are nominally 5/ 8 inch (15.9 mm) or 3/4 inch (19.1 mm) thick. Border panels are supported at walls by 24 MSG painted steel channels, 1 inch (25 mm) deep, with a 2-inch (23.8 mm) bottom flange. Optional support method consists of BERC-2 clip at wall attached to 15/16 inch × 15/16 inch No. 24 MSG painted steel channels. 4.7.7 Hold-down Clips: Hold-down clips, produced from No. 24 gage spring steel, must be used for ceiling panels weighing less than one pound per square foot. When the ceiling is composed of nominally 24-by-24-inch (610 by 610 mm), 24-by-36-inch (610 by 914 mm), or 30-by-30-inch (762 by 762 mm) lay-in panels, one clip is placed over bulbs of cross tees near cross tee midpoints. When the ceiling is composed of 20-by-60 inch (508 by 1524mm), 36-by- 36-inch (914 by 914 mm), 24-by-48-inch (610 by 1219 mm), 2130 E 17th St - 10111279406/07/23