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HomeMy WebLinkAboutFile Documents.534 E Cooper Ave.0117.2018 (10).ACBKThis technical bulletin provides allowable loads for top-flange joist hangers installed on walls, either over wood structural panel sheathing or over gypsum board (drywall), such as in firewall applications. Factors that may affect the performance of a top-flange joist hanger installed on a wall covered with sheathing or drywall include the following: •Drywall or wood sheathing tends to crush more easily than solid wood headers as the hanger deflects downward. •The thickness of the drywall or sheathing brings the top-flange nails closer to the edge of the top plate, which can cause the top plate to split more easily. •Face nails located in or near the junction of the top plates have less load resistance and face nails installed through drywall have less load resistance than nails installed into a solid header. Testing was performed on several top-flange hangers installed on walls composed of 2x4 studs spaced at 16" o.c. and double top plates that were fastened together according to minimum code requirements. Table A provides the allowable loads for joist hangers installed on walls sheathed with plywood or oriented-strand board (OSB). Table B provides allowable loads for joist hangers installed on walls covered with drywall. Joist Hangers on Plywood or OSB-Sheathed Walls: To achieve maximum download capacities, the plywood or OSB must be installed flush with the top of the wall. Where the sheathing is dropped down by 3⁄4", maximum, reduced download capacities apply. In both cases, the joist may be installed either between studs or directly over the stud. Installation: • Use specified fasteners. • Plywood or OSB (5⁄8" max.) on the joist hanger side must be attached to the wall framing per code. • Stud-to-plate connectors may be required, as determined by the Designer. Table A — Allowable Loads for Installation on Walls with Wood Structural Sheathing Top-Flange Joist Hanger Installation on Wall with Sheathing Flush with Top of Wall /" max. Top-Flange Joist Hanger Installation on Wall with Sheathing Dropped Down 1. Loads may not be increased for short-term loading. 2. Loads are based on unmodified hangers. 3. Loads are for the hanger only; the Designer must evaluate the capacity of wall. 4. Sheathing refers to wood structural panel sheathing (OSB or plywood). 5. Uplift loads have been increased for wind or earthquake loading with no further increase allowed. Reduce where other loads govern. Model No. Fasteners (in.) Allowable Loads (lb.) Uplift (160) Sheathing Flush with Top of Wall Sheathing Dropped 3⁄4" Max. Top Face Joist Download Download DF/SP SPF/HF DF/SP SPF/HF DF/SP SPF/HF ITS (4) 0.148 x 3 (2) 0.148 x 3 —120 120 1,195 1,150 765 765 MIT (4) 0.148 x 3 (4) 0.148 x 3 (2) 0.148 x 1 1⁄2 215 185 2,180 1,665 1,280 1,280 HIT (4) 0.148 x 3 (6) 0.148 x 3 (2) 0.148 x 1 1⁄2 315 270 2,180 2,000 1,280 1,280 BA (6) 0.148 x 3 (8) 0.148 x 3 (2) 0.148 x 1 1⁄2 255 220 2,555 2,425 2,045 2,045 HB (6) 0.162 x 3 1⁄2 (16) 0.162 x 3 1⁄2 (10) 0.162 x 2 1⁄2 710 610 5,500 3,820 3,385 3,385 HWP (3) 0.162 x 3 1⁄2 (6) 0.162 x 3 1⁄2 (10) 0.148 x 1 1⁄2 710 610 3,775 3,665 2,290 2,290 © 2019 Simpson Strong-Tie Company Inc. T-C-TFWALL19 Top-Flange Joist Hangers Installed on Walls over Wood Structural Panel Sheathing or Drywall TECHNICAL BULLETIN 02/07/2019 (800) 999-5099 strongtie.com This technical bulletin is effective until June 30, 2021, and reflects information available as of January 1, 2019. This information is updated periodically and should not be relied upon after June 30, 2021; contact Simpson Strong-Tie for current information and limited warranty or see strongtie.com. © 2019 Simpson Strong-Tie Company Inc. • P.O. Box 10789, Pleasanton, CA 94588 T-C-TFWALL19 1/19 exp. 6/21 Joist Hangers on Walls Covered by Drywall: Drywall that is installed flush with the top of the wall, and joist hangers that are installed directly over a stud result in the highest download capacities (exception: the ITS and MIT do not require a stud directly below for maximum load). Reduced download capacities are provided for joist hangers installed between studs with drywall flush with top of the wall, and for conditions when the drywall is dropped down by up to 3⁄4". Uplift loads do not apply to hangers installed over drywall. Installation: • Use specified fasteners. • Drywall (5⁄8" maximum thickness) on the joist hanger side must be attached to the wall framing per code. • Top plates must be restrained from rotating off the studs. Floor joists on the opposite side of the wall, or a bearing wall on top of the top plates will restrain the top plates. Other means of restraint include: nailing structural sheathing to the plates and studs on the side of the wall opposite the joist hangers; installing Simpson Strong-Tie® stud-to-plate connectors (e.g., SSP, RSP4) on the side of the wall opposite the joist hangers; or another method as determined by the Designer. •For installation over two layers of 5⁄8" drywall, see DG or DU series hangers in current Wood Construction Connectors catalog. Table B — Allowable Loads for Installation on Walls With Drywall Top-plate restraint typical(SSP shown) /" drywall attached per code MIT installedbetween studs BA installeddirectly over studfor maximum load Drywall flush with top of wall for maximum load Top-Flange Joist Hanger Installation on Wall with Drywall Flush with Top of Wall (Drywall may be dropped up to 3⁄4" with reduced loads) Drywall Joist Top-flangehanger Stud Joist hanger may be installedover drywall when a gap no greater than /" exists between the top of the drywall and the top of the top plate Top plates /" max. 1. Loads may not be increased for short-term loading. 2. Loads are based on unmodified hangers. 3. Loads are for the hanger only; the Designer must evaluate the capacity of wall. Model No. Fasteners (in.)Allowable Loads (lb.) Drywall Flush with Top of Wall Drywall Dropped ¾" Max. Top Face Joist Between 2x Studs @ 16" o.c. (Max.)2x Stud Directly Below Hanger Between 2x Studs @ 16" o.c. (Max.) DF/SP SPF/HF DF/SP SPF/HF DF/SP SPF/HF ITS (4) 0.148 x 3 (2) 0.148 x 3 —835 680 835 680 670 545 MIT (4) 0.148 x 3 (4) 0.148 x 3 (2) 0.148 x 1 1⁄2 1,735 1,380 1,735 1,380 1,665 1,325 HIT (4) 0.148 x 3 (6) 0.148 x 3 (2) 0.148 x 1 1⁄2 1,735 1,380 2,070 1,555 1,665 1,325 BA (6) 0.148 x 3 (8) 0.148 x 3 (2) 0.148 x 1 1⁄2 1,735 1,380 2,365 1,835 1,665 1,325 HB (6) 0.162 x 3 1⁄2 (16) 0.162 x 3 1⁄2 (10) 0.162 x 2 1⁄2 1,735 1,380 2,725 2,725 1,665 1,325 HWP (3) 0.162 x 3 1⁄2 (6) 0.162 x 3 1⁄2 (10) 0.148 x 1 1⁄2 2,615 2,080 2,910 2,910 2,615 2,080 Top-Flange Joist Hangers Installed on Walls over Wood Structural Panel Sheathing or Drywall TECHNICAL BULLETIN 02/07/2019