General · G-WBH3K

Fire Resistance Details

Materials

Gypsum / Drywall Metal (misc.)Stainless Steel Steel

Elements

Columns

Connections

HSS Connection

About this detail

A structural steel column is wrapped in multiple layers of 1/2-inch or 5/8-inch gypsum board secured with screws spaced 8 inches on center and 1 inch from board edges. Steel covers fabricated from 0.024-inch minimum thickness No. 24 gauge uncoated, galvanized, or stainless steel are applied using snap-lock, Pittsburgh seam, or lap joints fastened with No. 8 by 1/2-inch sheet steel screws spaced 12 inches on center maximum. Corner beads consisting of No. 28 message galvanized steel with 1-1/4-inch legs are attached to the wallboard with screws spaced 12 inches on center. Screws used to attach outer layers of wallboard to the steel cover measure 1 inch long for 1/2-inch wallboard and 1-1/4 inches long for 3/4-inch wallboard. Sodium silicate solution is optionally used to adhere wallboard layers to the interior of the steel cover prior to assembly, and joint compound is applied over corner beads to a 1/16-inch thickness.

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

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