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two-story-stacked

Design and installation information to guide the use of our Strong-Wall® high-strength wood shearwalls in back-to-back installations on concrete foundations.

Strong-Wall High-Strength Wood Shearwalls — Back-to-Back Installations

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Explore our dealer locator application to find an official dealer of Simpson Strong-Tie products near you in the United States and Canada.

Dealer Locator

<h1>Steel Strong-Wall&reg; Two-Story Stacked-On Concrete Foundations</h1>
  <div class="row">
    <div class="col-md-7">
      <p> Simpson Strong-Tie&reg; offers a complete stacked-wall solution for two-story applications. This Steel Strong-Wall Shearwall option combines simplified installation with superior performance. 
      </p>
      <ul>
        <li>Some of the highest loads in the industry and design procedures that account for <a href="/products/lateral-systems/strong-wall-shearwalls/technical-notes/cumulative-overturning">cumulative overturning</a></li>
        <li>Complete concrete-anchorage designs for two-story applications (foundation design by designer) </li>
        <li>No bearing plates to install, walls can now be placed flush against a corner</li>
        <li>Uses the same anchor bolt template as single-story installation</li>
        <li>Compression loads transferred by nut/rod &mdash; reducing wood crushing under load</li>
      </ul>
      <p><strong>Material:</strong> Vertical Panel&mdash;10 gauge<br>
      <strong>Finish:</strong> Vertical Panel&mdash;Galvanized Top and Base Plates&mdash;Simpson Strong-Tie gray paint </p>
      <p><strong>Codes:</strong> ICC-ES ESR-1679: <br>
        City of LA Building Code Supplement; <br>
        State of Florida FL5113 </p>
      <h3 class="h4">Top Wall:</h3>
      <img alt="Drawing: Top Wall" src="https://embed.widencdn.net/svg/ssttoolbox/vyemihccl2/C-L-SW21-56a.svg">
      <h3 class="h4">Bottom Wall:</h3>
      <img alt="Drawing: Bottom Wall" src="https://embed.widencdn.net/svg/ssttoolbox/jdo2cbpdiv/C-L-SW21-56b.svg">
      <p>Suggested Example Specification: SSW18x8 over SSW18x10-STK</p>
      <h2>Two-Story Stacked-Wall Connection Kit</h2>
      <img alt="Table: Two-Story Stacked-Wall Connection Kit" src="https://embed.widencdn.net/img/ssttoolbox/wygliqf7gr/500px@2x/C-L-SW21-56d.png">
      <ol>
        <li>Two heavy hex nuts included with each wall</li>
      </ol>
    </div>
    
    <div class="col-md-5">
      <div class="img-panel"> <img alt="Drawing: Two-Story Stacked Installation" src="https://embed.widencdn.net/svg/ssttoolbox/mzamcydxoy/C-L-SW21-56e.svg">
        <div class="image__caption"	><strong>Two-Story Stacked Installation</strong> <br>
        </div>
      </div>
    </div>
     
  </div>
  
  <div class="row">
    <div class="col-md-12">
      <h2>Two-Story Stacked Wall Product Data - Bottom Walls</h2>
      <table class="table-responsive-sm">
        <thead>
          <tr>
            <th rowspan="2">Model No.</th>
            <th rowspan="2">W (in.)</th>
            <th rowspan="2">H (in.)</th>
            <th rowspan="2">T (in.)</th>
            <th colspan="2">Anchor Bolts</th>
            <th rowspan="2">Number of Screws in Top of Wall</th>
          </tr>
          <tr>
            <th>Qty.</th>
            <th>Dia. (in.)</th>
          </tr>
        </thead>
        <tr>
          <td width="14%">SSW15x8-STK</td>
          <td width="14%">15</td>
          <td width="14%">93 1/4</td>
          <td width="14%">3 1/2</td>
          <td width="14%">2</td>
          <td width="14%">1</td>
          <td width="14%">6</td>
        </tr>
        <tr>
          <td>SSW18x8-STK</td>
          <td>18</td>
          <td>93 1/4</td>
          <td>3 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>9</td>
        </tr>
        <tr>
          <td>SSW21x8-STK</td>
          <td>21</td>
          <td>93 1/4</td>
          <td>3 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>12</td>
        </tr>
        <tr>
          <td>SSW24x8-STK</td>
          <td>24</td>
          <td>93 1/4</td>
          <td>3 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>14</td>
        </tr>
        <tr>
          <td class="primary">SSW15x9-STK</td>
          <td class="primary">15</td>
          <td class="primary">105 1/4</td>
          <td class="primary">3 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">6</td>
        </tr>
        <tr>
          <td class="primary">SSW18x9-STK</td>
          <td class="primary">18</td>
          <td class="primary">105 1/4</td>
          <td class="primary">3 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">9</td>
        </tr>
        <tr>
          <td class="primary">SSW21x9-STK</td>
          <td class="primary">21</td>
          <td class="primary">105 1/4</td>
          <td class="primary">3 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">12</td>
        </tr>
        <tr>
          <td class="primary">SSW24x9-STK</td>
          <td class="primary">24</td>
          <td class="primary">105 1/4</td>
          <td class="primary">3 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">14</td>
        </tr>
        <tr>
          <td>SSW15x10-STK</td>
          <td>15</td>
          <td>117 1/4</td>
          <td>3 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>6</td>
        </tr>
        <tr>
          <td>SSW18x10-STK</td>
          <td>18</td>
          <td>117 1/4</td>
          <td>3 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>9</td>
        </tr>
        <tr>
          <td>SSW21x10-STK</td>
          <td>21</td>
          <td>117 1/4</td>
          <td>3 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>12</td>
        </tr>
        <tr>
          <td>SSW24x10-STK</td>
          <td>24</td>
          <td>117 1/4</td>
          <td>3 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>14</td>
        </tr>
        <tr>
          <td class="primary">SSW15x11-STK</td>
          <td class="primary">15</td>
          <td class="primary">129 1/4</td>
          <td class="primary">5 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">6</td>
        </tr>
        <tr>
          <td class="primary">SSW18x11-STK</td>
          <td class="primary">18</td>
          <td class="primary">129 1/4</td>
          <td class="primary">5 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">9</td>
        </tr>
        <tr>
          <td class="primary">SSW21x11-STK</td>
          <td class="primary">21</td>
          <td class="primary">129 1/4</td>
          <td class="primary">5 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">12</td>
        </tr>
        <tr>
          <td class="primary">SSW24x11-STK</td>
          <td class="primary">24</td>
          <td class="primary">129 1/4</td>
          <td class="primary">5 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">14</td>
        </tr>
        <tr>
          <td>SSW15x12-STK</td>
          <td>15</td>
          <td>141 1/4</td>
          <td>5 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>6</td>
        </tr>
        <tr>
          <td>SSW18x12-STK</td>
          <td>18</td>
          <td>141 1/4</td>
          <td>5 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>9</td>
        </tr>
        <tr>
          <td>SSW21x12-STK</td>
          <td>21</td>
          <td>141 1/4</td>
          <td>5 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>12</td>
        </tr>
        <tr>
          <td>SSW24x12-STK</td>
          <td>24</td>
          <td>141 1/4</td>
          <td>5 1/2</td>
          <td>2</td>
          <td>1</td>
          <td>14</td>
        </tr>
        <tr>
          <td class="primary">SSW18x13-STK</td>
          <td class="primary">18</td>
          <td class="primary">153 1/4</td>
          <td class="primary">5 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">9</td>
        </tr>
        <tr>
          <td class="primary">SSW21x13-STK</td>
          <td class="primary">21</td>
          <td class="primary">153 1/4</td>
          <td class="primary">5 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">12</td>
        </tr>
        <tr>
          <td class="primary">SSW24x13-STK</td>
          <td class="primary">24</td>
          <td class="primary">153 1/4</td>
          <td class="primary">5 1/2</td>
          <td class="primary">2</td>
          <td class="primary">1</td>
          <td class="primary">14</td>
        </tr>
      </table>
      <ol>
        <li> See <a href="/products/strongwall/steel-strongwall/standard.asp#data">Standard Application on Concrete Foundations</a> for product data on top walls.</li>
      </ol>
    </div>
     
  </div>
  
  
  <div class="row">
    <div class="col-md-6">
      <h3 class="h4">Installation Notes</h3>
      <ul>
        <li>Do not cut the Steel Strong-Wall or enlarge existing holes,
          doing so will compromise the performance of the wall.</li>
        <li>Do not use an impact wrench to tighten nuts on the
          anchor bolts. </li>
        <li>For additional shim thickness, <a href="/search?v=%3Arelevance%3AdrawingFileType%3APDF&tab=drawing&keywordFilter=ssw2">see detail 5/SSW2 and 9/SSW2</a>.</li>
      </ul>
    </div>
    
    <div class="col-md-6">
      <h2>Shear-Transfer Plate Fasteners</h2>
      <img alt="Table: Shear-Transfer Plate Fasteners" src="https://embed.widencdn.net/img/ssttoolbox/zqtnivlhql/500px@2x/C-L-SW21-57a.png"></div>
     
  </div>
  
  <div class="row">
    <div class="col-md-12"> <img alt="Drawing: Two-Story Stacked Installation" src="https://embed.widencdn.net/svg/ssttoolbox/lbhiagdezx/C-L-SW21-57b.svg"> </div>
     
    
  </div>

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