FIRE-RESISTANCE DESIGN

Assembly Usage Disclaimer

BXUV - Fire Resistance Ratings - ANSI/UL 263 Certified for United States

BXUV7 - Fire Resistance Ratings - CAN/ULC-S101 Certified for Canada

See General Information for Fire-resistance Ratings - ANSI/UL 263 Certified for United States
Design Criteria and Allowable Variances

See General Information for Fire Resistance Ratings - CAN/ULC-S101 Certified for Canada
Design Criteria and Allowable Variances

Design No. M532

January 31, 2018

Restrained Assembly Ratings - 1 Hr.

Finish Rating - 52 Min.

This design was evaluated using a load design method other than the Limit States Design Method (e.g., Working Stress Design Method). For jurisdictions employing the Limit States Design Method, such as Canada, a load restriction factor shall be used — See Guide BXUV or BXUV7

* Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification (such as Canada), respectively.

    1. Flooring Systems — The flooring system shall consist of one of the following:

    System No. 1

    Finish Flooring — Min 23/32 in. thick plywood or oriented strand board (OSB) wood structural panels, min grade "C-D" or "Sheathing". Face grain of plywood or strength axis of panel to be perpendicular to joists with joints staggered. Panels secured to joist with 2-1/2 in. long smooth shank nails spaced 6 in. OC at the perimeter with one nail located 1-1/2 in. from each edge and 12 in, OC in the field with one nail located 4-3/4 in. from each edge.

    System No. 2

    Subflooring — Nom 19/32 in. thick wood structural panels installed perpendicular to the joists with end joints staggered. Plywood or panels secured to joists with construction adhesive and No. 6d ringed shank nails, spaced 12 in. OC along each joist. Staples having equal or greater withdrawal and lateral resistance strength may be substituted for the 6d nails.
    Vapor Barrier — (Optional) — Nom 0.010 in. thick commercial asphalt saturated felt.
    Finish Flooring — Floor Topping Mixture* — Min 3/4 in. thickness of floor topping mixture having a minimum compressive strength of 1800 psi. Refer to manufacturer's instructions accompanying the material for specific mix design.

    UNITED STATES GYPSUM CO — Types LRK, HSLRK, CSD


    USG MEXICO S A DE C V — Types LRK, HSLRK, CSD


    Floor Mat Materials* — (Optional) — Floor mat material loose laid over the subfloor. Refer to manufacturer's instructions regarding the minimum thickness of floor topping over each floor mat material.

    UNITED STATES GYPSUM CO — Types SAM, LEVELROCK® Brand Sound Reduction Board, LEVELROCK® Brand Floor Underlayment SRM-25


    System No. 3

    Structural Cement-Fiber Units* — Nom 3/4 in. thick, with long edges tongue and grooved. Long dimension of panels to be perpendicular to joists with end joints staggered a min of 2 ft and centered over the joists. Panels secured to joists with 1-5/8 in. long No. 8 self-drilling, self-countersinking steel screws spaced a max of 12 in. OC in the field with a screw located 1 in. and 2 in. from each edge, and 8 in. OC on the perimeter with a screw located 2 in. from each edge, located 1/2 in. from the side edges of the panel.

    UNITED STATES GYPSUM CO — Types STRUCTO-CRETE, USGSP


    2. Structural Wood Members — Min 9-1/2 in. deep "I" shaped wood joists spaced at a max of 24 in. OC. Joists shall conform to ICC-ES ESR-1153 Report. Joist top and bottom chords minimum 1-1/4 in. deep by 1-3/4 in. wide and constructed of either Microllam laminated veneer lumber (LVL) or TimberStrand laminated strand lumber (LSL). Webs constructed of minimum 3/8 in. thick Performance Plus OSB, PS2, Exposure 1. Installation shall be in accordance with manufacturers published literature.
    3. Resilient Channels — Resilient channels formed of 25 MSG galv steel, installed perpendicular to the joists spaced max 16 in. OC. when the insulation is draped over the resilient channels and gypsum board ceiling membrane. Resilient channels installed perpendicular to the joists spaced max 16 in. OC when the insulation is secured to the subfloor or to the wood joists with 0.90 in. diam galv steel wires, suspended above the ceiling membrane. Channels secured to each joist with 1-5/8 in. long Type S steel screws. Channel splices located beneath joists and overlapped 4 in. Two channels, spaced 6 in. OC, oriented opposite each gypsum board end joint as shown in end joint detail. Additional channels shall extend min 6 in. beyond each side edge of board.
    3A. Alternate Steel Framing Members — (Not Shown) — As an alternate to Item 3, main runners, cross tees, cross channels and wall angle as listed below.
      a. Main Runners — Nom 10 or 12 ft long, 15/16 in. or 1-1/2 in. wide face, spaced 4 ft. OC. Main runners suspended by min 12 SWG galv steel hanger wires spaced 48 in. OC. Hanger wires to be located adjacent to main runner/cross tee intersections. Hanger wires wrapped and twist-tied on 16d nails driven in to side of joists at least 5 in. above the bottom face.
      b. Cross Tees — Nom 4 ft long, 1-1/2 in. wide face, installed perpendicular to the main runners, spaced 16 in. OC. Additional cross tees or cross channels used at 8 in. from each side of butted gypsum panel end joints. The cross tees or cross channels may be riveted or screw attached to the wall angle or channel to facilitate the ceiling installation.
      c. Cross Channels — Nom 4 or 12 ft long, installed perpendicular to main runners, spaced 16 in. OC. When Batts and Blankets (Item 4) are used, cross channels spaced 16 in. OC.
      d. Wall Angle or Channel — Painted or galv steel angle with 1 in. legs or channel with 1 in. legs, 1-9/16 in. deep attached to walls at perimeter of ceiling with fasteners 16 in. OC. To support steel framing member ends and for screw-attachment of the gypsum panels.

      CGC INC — Type DGL or RX


      USG INTERIORS LLC — Type DGL or RX


    3B. Steel Framing Members* — (Optional, Not Shown) — As an alternate to Item 3 — Furring channels and Steel Framing Members as described below:
      a. Furring Channels — Formed of No. 25 ga galv steel, 2-3/8 in. wide by 7/8 in. deep, installed perpendicular to the joists spaced max 16 in. OC when the insulation is draped over the furring channels and gypsum board ceiling membrane. Furring channels installed perpendicular to the joists spaced max 16 in. OC when the insulation is secured to the subfloor or to the wood joists with 0.9 in. diam galv steel wires, suspended above the ceiling membrane. Channels secured to joist as described in Item b. Ends of adjoining channels overlapped 6 in. and tied together with double strand of No. 18 SWG galv steel wire near each end of overlap. Two channels, spaced 6 in. OC, oriented opposite each gypsum board end joint as shown in end joint detail. Additional channels shall extend min 6 in. beyond each side edge of board.
      b. Steel Framing Members* — Used to attach furring channels (Item a) to joists (Item 2). Clips spaced 48 in. OC and secured to the bottom chord to alternating joists with one No. 8 x 2-1/2 in. coarse drywall screw through center grommet. Furring channels are friction fitted into clips. Adjoining channels are overlapped as described in Item a. Additional clips required to hold furring channel that supports the gypsum board butt joints.

      PLITEQ INC — Type Genie Clip


    3C. Alternate Steel Framing Members* — (Optional, Not Shown) — As an alternate to Items 3 to 3B, furring channels and Steel Framing Members as described below.
      a. Furring Channels — Formed of No. 25 MSG galv steel. 2-9/16 in. or 2-23/32 in. wide by 7/8 in. deep, installed perpendicular to the joists spaced max 16 in. OC when the insulation is draped over the furring channels and gypsum board ceiling membrane. Furring channels installed perpendicular to the joists spaced max 16 in. OC when the insulation is secured to the subfloor or to the wood joists with 0.9 in. diam galv steel wires, suspended above the ceiling membrane. Channels secured to joists as described in Item b. Ends of adjoining channels overlapped 6 in. and tied together with double strand of No. 18 SWG galv steel wire near each end of overlap.
      b. Steel Framing Members* — Used to attach furring channels (Item a) to the wood joists (Item 2). Clips spaced a max of 48 in. OC. RSIC-1 and RSIC-1 (2.75) clips secured to alternating joists with No. 8 x 2-1/2 in. coarse drywall screw through the center grommet. Furring channels are friction fitted into clips. RSIC-1 clips for use with 2-9/16 in. wide furring channels. RSIC-1 (2.75) clips for use with 2-23/32 in. wide furring channels. Adjoining channels are overlapped as described in Item a. As an alternate, ends of adjoining channels may be overlapped 6 in. and secured together with two self-tapping No. 6 framing screws, min. 7/16 in. long at the midpoint of the overlap, with one screw on each flange of the channel. Additional clips required to hold furring channel that supports the wallboard butt joints, as described in Item 5.

      PAC INTERNATIONAL L L C — Types RSIC-1 or RSIC-1 (2.75)


    4. Batts and Blankets* — (Optional) Any thickness of mineral wool or glass fiber insulation, secured to the subfloor with staples, fitted in the concealed space, draped over the resilient channels and gypsum board ceiling membrane. If the insulation is secured to the subfloor or to the wood joists with 0.90 in. diam galv steel wires, suspended above the ceiling membrane, the resilient channels spaced max 16 in. OC. When the insulation is draped over the resilient channels and gypsum board ceiling membrane, the resilient channels spaced max 16 in. OC. Any mineral wool or glass fiber insulation bearing the UL Classification Marking for Surface Burning Characteristics having a flame spread index of 25 or less and a smoke developed index of 50 or less may be used.

      See Batts and Blankets (BKNV) category in the Building Materials Directory for names of manufacturers.

    5. Gypsum Board* — Two layers of 5/8 in. thick by 4 ft wide gypsum panels, installed perpendicular to resilient/furring channels. The base layer of panels screw-attached to the resilient/furring channels with 1 in. long Type S screws spaced 8 in. OC with the last two screws located 1 and 4 in from long edge of the board. The face layer screw-attached to the resilient/furring channels with 1-5/8 in. Type S screws spaced as the base layer. When Steel Framing Members (Item 3A) are used, gypsum board installed with long dimension perpendicular to cross tees. The base layer of panels fastened to cross tees with 1 in. long Type S screws spaced 8 in. OC at the butt joints and 16 in. OC in the field of the panel. The face layer screw-attached to the cross tees with 1-5/8 in. Type S screws spaced 8 in. OC and 1-1/2 in. Type G screws spaced 8 in. OC at the butt joints located mid-span between cross tees. Screws along sides and ends of panels spaced 3/8 to 1/2 in. from panel edge. End joints of panels shall be staggered with spacing between joints on adjacent panels not less than 4 ft OC. When Steel Framing Members (Item 3B or 3C) are used, the butt joints in the gypsum board shall be supported by two furring channels. The two furring channels shall be spaced approximately 3-1/2 in. OC, and be attached to underside of the joist with one RSIC-1, RSIC-1 (2.75) or Genie clip at each end of the channel.

    UNITED STATES GYPSUM CO — Type ULIX


    6. Finishing System — (Not Shown) — Vinyl, dry or premixed joint compound, applied in two coats to joints and screw-heads. Nom 2 in. wide paper tape embedded in first layer of compound over all joints. As an alternate, nom 3/32 in. thick veneer plaster may be applied to the entire surface of gypsum board.

    * Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification (such as Canada), respectively.

Last Updated on 2018-01-31
BXUV.M532 M532 BXUV 730408054 DESIGN Active 20180131 20180131 730408054 287840005 730408054 730408054 846414005 100575661 100238497 114328003 730408054

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