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BXUV.U419 - Fire Resistance Ratings - ANSI/UL 263 Page 6 of 9 installed on each side of the studs with 1 in. long Type 5 coated steel screws spaced 8 in. OC starting 4 in. from the edge of the board at the vertical edges and 12 in. OC starting 6 in. from the edge of the board at the center of each board. Gypsum boards are to be secured to the top and bottom track with screws spaced 8 in. OC starting 4 in. from the board edge. Fasteners shall not penetrate through both the stud and the treck at the same time. All horizontal joints are to be backed as outlined under section VI of Volume 1 in the Fire Resistive Directory. CANADIAN GYPSUM COMPANY — Type SCX. UNITED STATES GYPSUM CO — Type SCX. USG MEXICO S A DE C V— Type SCX. SD. Gypsum Board* —(As an alternate to Item 5) — 5/8 in. thick, 48 in wide, applied vertically or horizontally Secured as described in Item 6. For use with Items i and 2 only UNI7ED STATES GYPSUM CO — Type USGX. SE. Gypsum Board* —(Not Shown) -(As an alternate to Item 5 when used as the base layer on one or both sides of wall when 1/2 in. or 5/8 in thick products are specified, For direct attachment only to steel studs Item 2B, not to be used with Item 3). Nominal 5/8 in. thick lead backed gypsum panels with beveled, square or tapered edges, applied vertically. Vertical joints centered over studs and staggered min 1 stud cavity on opposite sides of studs. Wallboard secured to studs with 1-1/4 in. long Type S-12 (or No. 6 by 1-1/4 in long bugle head fine driller) steel screws spaced 8 in OC at perimeter and 12 in OC in the field. NEW ENGLAND LEAD BURNING CO INC, DBA NELCO — Nelco SF. Gypsum Board* —(As an alternate to Item 5) — For use with Items 1G and 2F and limited to 1 Hour Rating only, Gypsum panels with beveled, square or tapered edges, applied vertically, and fastened to the steel studs with 1 in long Type S screws spaced 8 in. OC along vertical and bottom edges and 12 in OC in the field. Vertical joints centered over studs and staggered one stud cavity on opposite sides of studs. Steel stud depth shall be a minimum 3-5/8 in. UNITED STATES GYPSUM CO — 5/8 in. thick Type SCX. SG. Gypsum Board* —(As an alternate to Item 5) — For use with Items SG and 2F only, Gypsum panels with beveled, square or tapered edges, applied vertically or horizontally, as specified in the table below and fastened to the steel studs as described in Item 6. Vertical joints centered over studs and staggered one stud cavity on opposite sides of studs. Vertical joints in adjacent layers (multilayer systems) staggered one stud cavity. Horizontal joints need not be backed by steel framing. Horizontal edge joints and horizontal butt joints on opposite sides of studs need not be staggered. Horizontal edge joints and horizontal butt joints in adjacent layers (multilayer systems) staggered a min of 12 in. The thickness and number of layers for the 2 hr, 3 hr and 4 hr ratings are as follows. Gypsum Board Protection on Each Side of Wall Min Stud No. of Layers Min Thkns of Rating, Depth, in. & Thickness Insulation Hr Item 2F of Panel (Item 4) 2 1-5/8 2 layers, 1/2 in. thick Optional 2 1-5/8 2 layers, 5/8 in. thick Optional 3 1-5/8 3 layers, 1/2 in. thick Optional 3 1-S/8 3 layers, 5/8 in thick Optional 4 1-5/8 4 layers, 5/8 in thick Optional 4 1-5/8 4 layers, 1/2 in thick Optional CANADIAN GYPSUM COMPANY — 1/2 in. thick Type C, IP-X2 or IPC-AR;, 5/8 in. thick Type AR, C, IP-AR, IP-X1, IP-X2, IPC-AR, SCX, SHX, or; 3/4 in thick Types IP-X3 or ULTRACODE UNITED STATES GYPSUM CO — 1/2 in. thick Type C, IP-X2, IPC-AR or; 5/8 in. thick Type SCX, SHX, IP-X1, AR, C, , FRX- G, IP-AR, IP-X2, IPC-AR , 3/4 in. thick Types IP-X3 or ULTRACODE http://database.ul.com/cgi-bin/XYV/template/LISEXT/1 FRAME/showpage.html?name=BX... 4/6/2011