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straps-ties-general-notes

General Notes for Straps and Ties

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<h1>Straps and Ties General Notes</h1>
<p>
  These general notes are provided to ensure proper installation of Simpson
  Strong-Tie straps and ties.
</p>
<ol type="a">
  <li>
    The (160) loads have been increased for wind or earthquake loading, with no
    further increase allowed. Reduce where other loads govern.
  </li>
  <li>
    When installing strap over 5/8" maximum wood structural panel sheathing, use
    2 1/2"-long nails minimum.
  </li>
  <li>
    SD screws are Simpson Strong-Tie® Strong-Drive® SD Connector screws. See
    <a
      href="/products/connectors/wood-construction-connectors/technical-notes/fastener-types-and-sizes"
      >Fastener Types and Sizes Specified for
      <span>Simpson Strong-Tie</span> Connectors</a
    >.
  </li>
  <li>
    For straight straps in tension, use half of the fasteners in each member
    being connected to achieve the listed loads.
  </li>
  <li>Tension loads apply for uplift when installed vertically.</li>
  <li>Field-bending straps is not recommended unless otherwise noted.</li>
  <li>
    If wood splitting is a concern, consider spacing the nails at every other
    location.
  </li>
  <li>
    The cut length of coil strap shall be equal to twice the “end length” noted
    in the tables plus the clear-span dimension.
  </li>
  <li>
    Straps 16 ga. and heavier can be fillet welded to structural steel members.
    The designer shall specify the weld size and length. Welding and
    specification shall be in compliance with the current American Welding
    Society ANSI/AWS D1.3, Structural Welding Code – Sheet Steel.
  </li>
</ol>
<div class="row">
  <div class="col-md-6">
    <h4>
      Load Adjustment Factors for Optional Fasteners Used with Straight Straps
    </h4>
    <img
      alt="Load Adjustment Factors for Optional Fasteners Used with Straight Straps"
      src="https://embed.widencdn.net/img/ssttoolbox/prdfqjzpyc/800px@2x/C-C-2021-p266a.png9.png"
    />
    <ol>
      <li>
        Allowable load adjustment factors shown in the table are applicable to
        all straight straps throughout this catalog, except as noted in the
        footnotes below.
      </li>
      <li>
        Some products have been tested specifically with alternative fasteners
        and have allowable load adjustment factors or reduced capacities
        published on the specific product page. Values published on the product
        page may be used in lieu of using this table.
      </li>
      <li>
        For straps installed over 5/8" maximum wood structural panel sheathing,
        use a 2 1/2"-long fastener minimum.
      </li>
      <li>
        This table does not apply to straps made of steel thicker than 10 ga.
      </li>
      <li>
        Where noted, use 0.80 for 10 ga., 11 ga., and 12 ga. products when using
        SPF lumber.
      </li>
      <li>
        Where noted, use 0.92 for 10 ga., 11 ga., and 12 ga. products when using
        SPF lumber.
      </li>
    </ol>
  </div>
  
  <div class="col-md-6">
    <img
      alt="Coil Straps Installation"
      src="https://embed.widencdn.net/img/ssttoolbox/bjzdcj6jnv/400px@2x/C_Straps_InstIll_Ill_Instld_FloorToFloorStrap-Misinstall_C0.png"
    />
    <p>
      When installing floor-to-floor straps, wood shrinkage and compression that
      occurs during construction may cause the straps to bow out if both ends of
      the strap are nailed during initial installation.
    </p>
    <p>
      To prevent this, filling all fastener holes in the strap (including the
      rim joist area) will limit the bowing. Alternatively, fill the holes in
      the top of the strap before the roof is installed and then filling the
      bottom half of the strap after will also help reduce bowing.
    </p>
  </div>
  
</div>

<div class="notice">
  <div class="icon icon-info"></div>
  <div class="notice__content">
    <strong>Not Sure How Much Coil Strap You Need?</strong> Simpson Strong-Tie
    has a web-based app, the
    <a
      href="https://www2.strongtie.com/webapps/CoilStrapCalculator/DesignCalculator.aspx"
      >Coil Strap Length Calculator</a
    >, which can help you quickly determine the cut length of each strap and the
    total amount of coil strap needed for each application on a project.
  </div>
</div>
<h2>Considerations for Hurricane Tie Selection</h2>
<ol>
  <li>What is the uplift load?</li>
  <li>What is the parallel-to-plate load?</li>
  <li>What is the perpendicular-to-plate load?</li>
  <li>
    What is the species of wood used for the rafter and the top plates? (Select
    the load table based on the lowest performing species of wood.)
  </li>
  <li>
    Will the hurricane tie be nailed into both top plates or the upper top plate
    only?
  </li>
  <li>
    What load or loads will the hurricane tie be taking?
    <ul class="no-style">
      <li>
        <p>
          <strong>Simultaneous Loads</strong><br />
          When a connector is loaded simultaneously in more than one direction,
          the allowable load must be evaluated as option 1 or 2.
        </p>
        <p>
          <strong>Option 1: Unity Equation</strong><br />
          For all connectors use the following equation:<br />
          Design Uplift / Allowable Uplift + Design Lateral Parallel to Plate /
          Allowable Lateral Parallel to Plate + Design Lateral Perpendicular to
          Plate / Allowable Lateral Perpendicular to Plate &lt; 1.0.
        </p>
        <p>
          The three terms in the unity equation are due to the possible
          directions that exist to generate force on a connector. The number of
          terms that must be considered for simultaneous loading is at the sole
          discretion of the designer and is dependent on their method of
          calculating wind forces and the utilization of the connector within
          the structural system.
        </p>
        <p>
          <strong>Option 2: 75% Rule</strong><br />
          As an alternative, certain roof-to-wall connectors (reference embedded
          truss anchors, pp. 254–255, seismic and hurricane ties, pp. 276–279,
          and twist straps, p. 283
          <a href="/resources/literature/wood-construction-connectors-catalog"
            >of the Wood Construction Connectors Catalog</a
          >) can be evaluated using the following: The design load in each
          direction shall not exceed the published allowable load in that
          direction multiplied by 0.75.
        </p>
      </li>
    </ul>
  </li>
  <li>
    Select hurricane tie based on performance, application, installed cost and
    ease of installation.
  </li>
</ol>
<hr />
<h5>
  Some hurricane ties and twist straps can be installedin pairs to achieve a
  higher load. Both connectors shallbe the same model. Refer to the
  <a href="/resources/literature/high-wind-product-guide"
    >High Wind–Resistant Construction Application Guide</a
  >.
</h5>
<div class="row">
  <div class="col-md-4 col-sm-6 col-xs-6">
    <div class="image">
      <img
        alt="H5 Topview"
        src="https://embed.widencdn.net/img/ssttoolbox/unbih6uz64/400px@2x/C_H25A_InstIll_Ill_Instld_HurricaneTie-Diagonal-PlanView_CY.png"
      />
      <div class="image__caption">
        Install diagonally across from each other for minimum
        <span>2x truss</span>.
      </div>
    </div>
  </div>
  
  <div class="col-md-4 col-sm-6 col-xs-6">
    <div class="image">
      <img
        alt="H25A Topview"
        src="https://embed.widencdn.net/img/ssttoolbox/vns4h4mxs7/400px@2x/C_H25A_InstIll_Ill_Instld_HurricaneTie-SameSide-PlanView_CY.png"
      />
      <div class="image__caption">
        Products can be on the same side of the wall provided they are
        configured as shown.
      </div>
    </div>
  </div>
</div>

<h5>Avoid a Misinstallation</h5>
<div class="row">
  <div class="col-md-4 col-sm-6 col-xs-6">
    <div class="image">
      <img
        alt="H25A Misinstallation"
        src="https://embed.widencdn.net/img/ssttoolbox/kzkrfsm7im/400px@2x/H25A_Misinstall_in.png"
      />
      <div class="image__caption">
        Do not make new holes or overdrive nails.
      </div>
    </div>
  </div>
  
  <div class="col-md-4 col-sm-6 col-xs-6">
    <div class="image">
      <img
        alt="H5 Misinstallation"
        src="https://embed.widencdn.net/img/ssttoolbox/aj3ih9yeqr/400px@2x/C_H25A_InstDtl_Ill_Instld_HurricaneTie-SameSide-MissInstall-PlanView_CY.png"
      />
      <div class="image__caption">
        Nailing into both sides of a single 2x truss may cause the wood to
        split.
      </div>
    </div>
  </div>
  
</div>