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l I � <br /> . BXLTV.L502 - Fire Resistance i atings -ANSWL 263 Page 7 of 9 <br /> : � , <br /> � USG INTERIORS INC—Type DGL or RX. <br /> • I <br /> ; i <br /> � 6D. Steel Framing Members (Not Shown)* As an alternate to Items 6, 6A, 6B and <br /> 6C, furring channels and Steel Framing Members as described below: <br />� a. Furring Channlels Formed of No. 25 MSG galv steel. 2-3/8 in. wide by 7/8 in. <br /> deep, spaced 24 m: OC perpendicular to joists. Channels secured to joists as <br /> described in Item b. Ends of adjoining channels overlapped 6 in. and tied together <br /> with double strand�of No. 18 SWG galv steel wire near each end of overlap. <br /> � <br /> b. Steel Framing Members*used to attach furring channels (Item a)to joists (Item <br /> 5). Clips spaced 48 in. OC., and secured to altemating joists with No. 8 x 2-1/2 in. <br /> , coarse drywall screw through the center grommet. Furring channels are friction fitted <br /> ' into clips. Adjoining channels are overlapped as described in Item a. Additional clips <br /> �' required to hold fiirring channel that supports the wallboard butt joints, as described <br /> � in Item 7. � <br /> , <br /> PAC INTERNATIONAL INC—Type RSIC-1. <br /> � 7. Gypsum Board* 1/2 in. thick, 4 ft wide. When resilient channels (Item 6) are <br /> used,wallboard iristalled with long dimension perpendicular to furring channels and <br /> , side joints of sheei located between joists. <br /> � Wallboard screws are driven through channel spaced 12 in. OC. End joints of <br /> ,' wallboard similarly fastened to additional pieces of furring channel which are <br /> attached to joists and extend 6 in.beyond each end of joint. • ' <br /> � <br /> i <br /> When Steel Framing Members* (Item 6A , 6B, 6C) are used, wallboard installed <br /> with long dimensi�on perpendicular.to cross tees with side joints centered along main <br /> runners and end joints centered along cross tees. Fastened to cross tees with 1 in. long <br /> wallboard screws�spaced 12 in: OC in the field and 8 in OC along end joints. <br /> ,Fastened adjacent wallboard sheets held to the end joint furring channel by means of <br /> �; one wallboard screw on each side of the end joints. All edge screws located 3/8 to <br /> 1/2-in. min distance from edges of wallboard sheets to main runners with 1 in, long <br /> wallboard screws ispaced 16 in. OC,midway between cross tees. Screws along sides <br /> and ends of board's spaced 1/2 in. from board edge. End joints of the sheets shall be <br /> , staggered with spi cing between joints on adjacent boards not less than 4 ft OC. <br /> When Steel Framing Members* (Item 6D) are used, sheets installed with long <br /> dimension perpendicular to furring channels and side joints of sheet located beneath <br /> joists. Wallboard�screws are driven through channel spaced 12 in. OC in the field. <br /> Wallboard butt joints shall be staggered min. 2 ft. within the assembly, and occur <br /> , between the main�furring channels. At the wallboard butt joints, each end of the <br /> ;- � gypsum board shall be supported by a single length of furring channel equal to the <br /> width of the wallboard plus 6 in. on each end. The furring channels shall be spaced <br /> � approximately 3-1/2 in. OC, and be attached to the joist with one RSIC-1 clip at each <br /> � end of the channel. Screw spacing along the butt joint to attach the wallboard to the <br /> furring channels i hall be 8 in. OC. <br />� i <br /> http://database.ul.com/cgi-bin/XYV/template/LISEXT/1 FRAME/showpage.html?name=BXU... 4/19/02 <br />