Text on the drawing
1 2 3 A A A A Fire Resistance Ratings - ANSI/UL 263 Design No. X526 April 22, 2009 Ratings — 1, 2, 3 and 4 Hr. 1. Steel Column — Min sizes of W shape and tubular steel columns in the AISC Steel Construction Manual as shown under Item 2. 2. Gypsum Board — Any 5/8 in. thick or 1/2 in. thick wallboard bearing the Underwriters Laboratories Inc. Fire Resistance Classification Marking. Min total thicknesses of layers in inches for the various ratings and min column sizes are as follows: W Shape Columns Min Column Size Rating Hr Total Thkns of Dsg Outside Flange Web Layers of Dimensions Thkns Thkns Area Wallboard In. In. In. In. In.² 1 2 3 4 W4x13 4-1/8x4 0.345 0.280 3.82 1 1-1/2 2-1/4 — W6x15.5 6x6 0.269 0.235 4.56 1 1-1/2 2-1/4 3-1/8 W10x49 10x10 0.558 0.340 14.4 1/2 1-1/8 1-7/8 2-1/2 Tubular Shape Columns Rating Hr Total Thkns of Min Column Size Layers of Wallboard In. Dsg Outside Dimensions Thkns Area In. In. In.² 1 2 3 4 TS4X4X0.188 4X4 0.188 2.74 1 1-3/4 2-5/8 - TS8X8X0.250 8X8 0.250 7.48 5/8 1-1/2 2-1/2 - Applied in layers as shown in above illustration. Each layer held together with paper masking adhesive tape during erection to allow placement of succeeding layers. For column ratings of 2 hr or less, one layer of wallboard may be applied to the outer surface of steel cover. Boards applied vertically, without horizontal joints, attached to cover with screws located 1 in. from the board edge and 8 in. OC. See Gypsum Board (CKNX) category for names of manufacturers. 2A. Gypsum Board* — As an alternate to Item 2, 3/4 in. thick applied as described in Item 2. CANADIAN GYPSUM COMPANY — Type IP-X3 or ULTRACODE UNITED STATES GYPSUM CO — Type IP-X3 or ULTRACODE USG MEXICO S A DE C V — Type IP-X3 or ULTRACODE 3. Steel Covers — For seamed joints — 0.024 in. min thickness (No. 24 MSG) uncoated, galv or stainless steel, for column ratings of 3 hr or less. For 4 hr ratings, only stainless steel cover to be used. Covers consist of two L-shaped sections with Snap-Lock or Pittsburgh sheet steel joints. Width to be determined on the basis of protection thickness and column size. Length of sections to provide 1/8 in. clearance per lineal foot of column length between cover and any restraint. For lapped joints — (Max ratings 2 hr) — No. 22 MSG (0.027 in. thick) uncoated or galv steel. Fasteners used at laps to be No. 8 by 1/2 in. steel sheet metal screws spaced a max of 12 in. O.C. Other details to be the same as those stated for seamed joints as shown above. 4. Corner Bead — For columns with outer layer of wallboard attached to outside surface of metal cover, No. 28 MSG galv steel, 1-1/4 in. legs corner beads attached to wallboard with screws spaced 12 in. O.C. 5. Screws — For columns with outer layer of wallboard attached to outside surface of metal cover, self- drilling Phillips bugle head, 1 in. long screws for 1/2 or 5/8 in. thick wallboard (1-1/4 in. long screws for 3/4 in. thick wallboard) are used to attach wallboard to steel cover, and corner bead to wallboard. 6. Sodium Silicate Solution — (Not shown, optional) — Used to adhere one layer of wallboard to inside of steel cover prior to assembly. 7. Finishing System — (Not shown) — Joint compound applied over corner beads to a thickness of 1/16in. *Bearing the UL Classification Mark 1 2 3 3 2 5 4 5 2 3 1/4" 1/2" 1/4" 3/8" PITTSBURG SEAM LAP SNAP-LOCK 3/4" NO. 8 x 1/2 SHEET STEEL SCREWS SPACED 12" O.C. MAX LAP JOINT 3/4" NO. 8 x 1/2 SHEET STEEL SCREWS SPACED 12" O.C. MAX SCALE: 6" = 1'-0" A2 FIRE RESISTANCE DETAILS
Members view this detail in full resolution, download the CAD files (SVG, PDF), and open any detail in the built-in CAD editor to edit and export DXF or DWG.
Sign in to subscribe