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. G558

January 31, 2018

Restrained Assembly Rating — 1 Hr

Unrestrained Assembly Rating — 1 Hr

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.

    Joist Weight Allowable Strength Factored Resistance
    Ma Va Vah Mr Vr Vrh
    (plf) (k-ft) (kip) (kip) (k-ft) (kip) (kip)
    12-i-2 4.53 4.33 1.48 1.03 6.87 2.25 1.57
    12-i-3 5.61 5.68 2.31 1.62 9.02 3.51 2.46
    12-i-4 6.94 7.18 3.61 2.53 11.4 5.48 3.84
    14-i-2 4.90 5.17 1.48 1.03 8.20 2.25 1.57
    14-i-3 6.07 6.80 2.31 1.62 10.8 3.51 2.46
    14-i-4 7.52 8.65 3.61 2.53 13.7 5.48 3.84
    16-i-2 5.27 6.01 1.48 1.03 9.53 2.25 1.57
    16-i-3 6.53 7.92 2.31 1.62 12.6 3.51 2.46
    16-i-4 8.09 10.1 3.61 2.53 16.0 5.48 3.84

    Notation

    Ma - flexural resistance in accordance with Allowable Stress Design

    Va - shear resistance in accordance with Allowable Stress Design at gross section (solid web)

    Vah - shear resistance in accordance with Allowable Stress Design at net section (hole location)

    Mr - flexural resistance in accordance with Load and Resistance Factor Design

    Vr - shear resistance in accordance with Load and Resistance Factor Design at gross section (solid web)

    Vrh - shear resistance in accordance with Load and Resistance Factor Design at net section (hole location)

    1. Structural Cement-Fiber Units* — Subfloor of minimum 3/4 in thick tongue-and-groove cement-fiber board. Long edges of board to be perpendicular to joists with ends staggered and centered over structural steel members. The board is to be fastened to the steel joists with #8 self drilling, self tapping cement board screws 1-5/8 in. long. Screws shall be spaced 1/2 in. from end joints and 8 in. OC along the end joints, and 1 and 2 in. from side joints and 12 in. OC in the field of each sheet.

    UNITED STATES GYPSUM CO — Types STRUCTO-CRETE, USGSP


    2. Structural Steel Members* — "TotalJoist™"- Minimum 12 in. deep, 18 ga, spaced maximum 24 in. OC. Web stiffeners screwed to both ends of joists using 6 hex head, self drilling, self tapping #12 steel screws 1.0 in long and to steel C-shaped assembly tracks (rim joists) using 3 hex-head, self drilling, self tapping #12 steel screws 1.0 in. long. Effects of loads for the "TotalJoist™"shall not exceed those calculated on the basis of the joist section properties as shown in the table above. Refer to the joist manufacturer's installation instructions for detailed design information.

    ISPAN SYSTEMS LP — "TotalJoist™"


    3. Bridging* — "TotalJoist™" snap-on bridging, 1-7/8 in. by 5/8 in. by minimum 20 GA. bridging attached to bottom chords on each joist and located 8 ft - 0 in. apart or at mid-point of joist for shorter spans. Bridging attached to chords of each joist using 1-No.12-14, 3/4 in. long, self-drilling screw.
    Optional Bridging* — "TotalJoist™" Bridging, 1-7/8 in. by 5/8 in. by minimum 20 GA. Bridging installed perpendicular to joists through web holes and located 8ft- 0 in. apart or at mid-point of joist for shorter spans. Bridging attached to flange of web hole in each joist using 1 hex head, self-drilling, self-tapping #10 screw, 3/4 in. long. Alternatively, bridging may be attached to joists using minimum 3/4 in. by 3/4 in. by 20 GA. clip angle. Clip angle fastened to joist web and to bridging using 1 hex head, self-drilling, self-tapping #10 screw, 3/4 in. long.

    ISPAN SYSTEMS LP — "TotalJoist™" Snap-On Bridging, "TotalJoist™" Bridging.


    4. Blocking* — "TotalJoist™" Blocking, 18 GA. Blocking attached to every fifth bridging location between joists using 2-No.12-14, 1 in. long, self-drilling screws
    4A. Alternative Blocking (not shown) — "TotalJoist™" cut to fit the space between the two adjacent joists and attached to joists with 16 ga. 6 in. by 3 in. Angle connected to blocking and joist with 2-#12-14, 1 in. long. self-drilling screws on each leg of the angle.

    ISPAN SYSTEMS LP — "TotalJoist™" Blocking


    5. Batts and Blankets — Glass fiber insulation, min 3-1/2 in. thick, min 0.6 lb/cu ft density, bearing the UL Classification Marking for Surface Burning Characteristics and having a flame spread value of 25 or less and a smoke developed value of 50 or less. Insulation fitted in the concealed space, draped over the resilient channels and gypsum board ceiling membrane.
    6. Resilient Channels — Minimum 26 GA galvanized steel. Channels shall be spaced maximum 12 in. apart and attached to the bottom flange of each joist with one 1/2 in. long wafer head self-drilling, self-tapping #8 steel screw. At locations where gypsum board end joints occur, additional resilient channels shall be installed to provide screw attachments for the gypsum board ends. These additional channels shall be positioned so that the distance from the end of the board to the centre of the first channel is 3 in. and from the board end to the centre of the next channel is 12 in.
    6A. Steel Framing Members* — (Optional, Not Shown) — As an alternate to Item 6 — Furring channels and Steel Framing Members as described below:
      a. Furring channels — Formed of No. 25 MSG galv steel, 2-3/8 in. wide by 7/8 in. deep, spaced 12 in. OC, perpendicular to joists. Channel 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. Additional channels shall be positioned so that the distance from the end of the board to the center of the first channel is 3 in. and from the board end to the center of the next channel is 12 in.
      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 of joists with min 1-5/8 in. long No. 8 self-drilling, self-tapping, bugle, flat or hex head screw through the center grommet. Furring channels are friction fitted into clips. Additional clips required to hold furring channel that supports the gypsum board butt joints.

      PLITEQ INC — Type Genie Clip


    6B. Alternate Steel Framing Members* — (Optional, Not Shown) — As an alternate to Items 6 to 6A, 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, spaced 12 in. OC, perpendicular to joists. 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 steel 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 7.

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


    7. Gypsum Board* — Nominal 5/8 in. thick, 48 in. wide gypsum board installed with long dimension perpendicular to resilient/furring channels. Gypsum board shall be attached to resilient/furring channels using 1 in. long Type S drywall screws, spaced 8 in. OC in the field of each board. At the side joints, screws shall be located 1-1/2 in. and 4 in. from the board edge. At the end joints, screws shall be located 3 in. and 12 in. from the board end. When Steel Framing Members (Item 6A or 6B) 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.

    CGC INC — Type C


    UNITED STATES GYPSUM CO — Type C, ULIX


    USG MEXICO S A DE C V — Type C


    8. Joint System — (Not shown) Paper tape embedded in joint compound over joints and covered with 2 layers of compound with edges feathered out. Wallboard screw heads covered with 2 layers of compound.

    * 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.G558 G558 BXUV 730408054 DESIGN Active 20180131 20180131 730408054 100560153 100560153 100560153 100238497 114328003 846414005 730408054 287840003

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