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BXUV.U437
Fire Resistance Ratings - ANSI/UL 263

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Fire Resistance Ratings - ANSI/UL 263


See General Information for Fire Resistance Ratings - ANSI/UL 263

Design No. U437

September 26, 2006

Nonbearing Wall Ratings — 1 or 2 Hr (See Item 5)

    1. Floor and Ceiling Runners — "J"-shaped runner, min 4 in. deep with unequal legs of 1 in. and 2 in., fabricated from 20 MSG galv steel. Runners positioned with short leg toward finished side of wall. Runners attached to structural supports with steel fasteners located not greater than 2 in. from ends and spaced no more than 24 in. OC.
    2. Vertical Runners — "J"-shaped runner, min 4 in. deep with unequal legs of 1 in. and 2 in., fabricated from 20 MSG galv steel. Vertical runners positioned at each end of the wall with short leg toward finished side of wall. Runners attached to structural supports with steel fasteners located not greater than 2 in. from ends and spaced no more than 24 in. OC.
    3. Steel Studs — "C-H" -shaped studs, min 4 in. deep, with 1-1/2 in. wide flanges, fabricated from 20 MSG galv steel. Installed horizontally, with the "C" section of the studs facing down, friction fitted in the vertical "J"-shaped runners resting upon 2 by 2 in. by 20 ga. steel angles which are fastened to the side "J"-shaped runners. Studs cut to lengths to allow a 3/8 to 1/2 in. gap at each end of the wall, and spaced vertically 24 in. or 600 mm OC. As an option, the studs may be screw attached to the side "J"-shaped runners. A total of four 1/2 in. long pan-head steel screws are to be installed, one at each end of the stud on each side of the wall.
    4. Gypsum Board* — 1 in. thick gypsum wallboard liner panels, supplied in nom 24 in. or 600 mm (for metric spacing) widths. Panels cut to lengths 1 in. less than the width of the wall. Once between the vertical "J"-shaped runners, the panels are centered to split equally at each end the 1 in. gap. Installed horizontally, with the long edges inserted in the "H" section of the "C-H"-shaped studs. The top edge of the liner panel shall be cut 1 in. less than opening height to allow installation past the 1 in. leg of J-runner. Free edge of panels attached to the long leg of the top and bottom "J" -runners with 1-5/8 in. long Type S or S-12 steel screws spaced no more than 12 in. OC. The width of the wall is limited to the length of the liner panels (no butt joints in the liner panels).

    CANADIAN GYPSUM COMPANY — Type SLX


    UNITED STATES GYPSUM CO — Type SLX


    USG MEXICO S A DE C V — Type SLX


    5. Gypsum Board* — 5/8 in. thick, 24 to 54 in. wide gypsum panels applied vertically in one (1-hr system) or two (2-hr system) layers. Vertical joints between panels need not be backed by framing. Vertical joints between layers staggered a minimum of 12 in. Horizontal joints centered over studs and staggered a minimum of 24 in. in adjacent courses and 24 in. between layers. 1-Hr System: Single layer attached to studs and vertical and horizontal "J"-shaped runners with 1 in. long Type S or S-12 steel screws spaced 8 in. OC. Joints covered with paper tape and joint compound. Exposed screw heads covered with joint compound. Joint tape and compound may be omitted when square edge panels are used. 2-Hr System: Base or inner layer attached to studs and vertical and horizontal "J"-shaped runners with 1 in. long Type S or S-12 steel screws spaced 12 in. OC. Outer or face layer attached to studs and vertical and horizontal "J"-shaped runners with 1-5/8 in. long Type S or S-12 steel screws spaced 8 in. OC. Outer layer joints covered with paper tape and joint compound. Exposed screw heads covered with joint compound. Joint tape and compound may be omitted when square edge panels are used.

    CANADIAN GYPSUM COMPANY — Type AR, IP-AR, IP-X1, SCX or WRX


    UNITED STATES GYPSUM CO — Type AR, IP-AR, IP-X1, SCX, WRX or FRX-G


    USG MEXICO S A DE C V — Type AR, IP-AR, IP-X1, SCX or WRX


    6. Batts and Blankets* — (Optional - Not shown) — Mineral wool or glass fiber batts partially or completely filling stud cavity. Any mineral wool or glass fiber batt material bearing the UL Classification Marking as to Surface Burning Characteristics and/or Fire Resistance.

    *Bearing the UL Classification Mark

Last Updated on 2006-09-26

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