5013 S 3RD AVE 2018-06-27 - Laserfiche WebLink

FII AND§MOKE PROTECTION FEATI_ • TABLE 721.1(2)-continued RATED FIRE-RESISTANCE PERIODS FOR VARIOUS WALLS AND PARTITIONS''°' h. See also Note b.The equivalent thickness shall be permitted to include the thickness of cement plaster or 1.5 times the thickness of gypsum plaster applied in acc ordance with the requirements of Chapter 25. i. Concrete walls shall be reinforced with horizontal and vertical temperature reinforcement as required by Chapter 19. j. Studs are welded truss wire studs with 0.18 inch(No.7 B.W.gage)flange wire and 0.18 inch(No.7 B.W.gage)truss wires. k.Nai Table metal studs consist of two channel studs spot welded back to back with a crimped web forming a nailing groove. 1. Wood structural panels shall be permitted to be installed between the fire protection and the wood studs on either the interior or exterior side of the wood frame assemblies in this table,provided the length of the fasteners used to attach the fire protection is increased by an amount at least equal to the thickness of the wood structural panel. I m.For studs with a slenderness ratio,l/d,greater than 33,the design stress shall be reduced to 78 percent of allowable F',.For studs with a slenderness ratio, l/d,not exceeding 33,the design stress shall be reduced to 78 percent of the adjusted stress F',calculated for studs having a slenderness ratio l/d of 33. n. For properties of cooler or wallboard nails,see ASTM C 514,ASTM C 547 or ASTM F 1667. o. Generic fire-resistance ratings(those not designated as PROPRIETARY*in the listing)in the GA 600 shall be accepted as if herein listed. p.NCNA TEK 5-8A shall be permitted for the design of fire walls. q. The design stress of studs shall be equal to a maximum of 100 percent of the allowable F',calculated in accordance with Section 2306. TABLE 721.1(3) MINIMUM PROTECTION FOR FLOOR AND ROOF SYSTEMSe'Q THICKNESS OF FLOOR OR MINIMUM THICKNESS OF ROOF SLAB CEILING FLOOR OR ROOF ITEM CEILING CONSTRUCTION (inches) (inches) CONSTRUCTION NUMBER 4 3 2 1 4 3 2 1 hours hours hours hour hours hours hours hour 1.Siliceous aggre- 1-1.1 7.0 6.2 5.0 3.5 - - - - gate concrete 2.Carbonate 2.1.16.6 5.7 4.6 3.2 - - - - aggregate concrete Slab(no ceiling required).Minimum cover over nonpre- stressed reinforcement shall not be less than 3.Sand-light- 3-1 1 3/4"b 5.4 4.6 3.8 2.7 - - - - weight concrete 4.Lightweight 4-1.1 5.1 4.4 3.6 2.5 - - - - concrete Slab with suspended ceiling of vermiculite gypsum plaster 5-1.1 over metal lath attached to 3/4'cold-rolled channels spaced 3 2 - - 1 3/4 - - 12"on center.Ceiling located 6"minimum below joists. 3/$"Type X gypsum wallboard'attached to 0.018 inch(No. 25 carbon sheet steel gage)by 7/8"deep by 25/$"hat-shaped galvanized steel channels with 1"-long No.6 screws.The channels are spaced 24"on center,span 35"and are sup- ported along their length at 35"intervals by 0.033"(No.21 5.Reinforced galvanized sheet gage)galvanized steel flat strap hangers concrete having formed edges that engage the lips of the channel. 5-2.1 The strap hangers are attached to the side of the concrete - - 21/2 - - - 5/8 - joists with 5/32"by 1'4"long power-driven fasteners.The wallboard is installed with the long dimension perpendicu- lar to the channels.All end joints occur on channels and supplementary channels are installed parallel to the main channels, 12"each side,at end joint occurrences.The fin- ished ceiling is located approximately 12"below the soffit of the floor slab. (continued) ....)" -5.-- 158 2012 INTERNATIONAL BUILDING CODE®