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<h1>Bases and Caps General Notes</h1>

<ol type="a">
  <li>
	Uplift and lateral loads have been increased for earthquake or wind loading
	with no further increase allowed. Reduce where other loads govern.
  </li>
  <li>
  	Downloads are based on full bearing of the post on the post base and post
cap. Downloads may not be increased for short-term loading, and shall be
reduced where limited by the post allowable load. See
	<a
	  href="/products/connectors/wood-construction-connectors/technical-notes/post-capacities"
	  >common post allowable loads</a
	>.
  </li>
  <li>
	For post bases with 1" standoffs, full bearing on concrete is required.
	Standoffs shall bear on top of concrete and not be embedded into wet
	concrete. A higher download may be achieved by solidly packing grout in the
	1" standoff area before installation of the post. Allowable download shall
	be based on the capacity of the post, grout or concrete according to the
	code. (Figure 1)
  </li>
  <li>The designer is responsible for concrete design.</li>
  <li>
  	For post-installed bases, the designer must specify anchor bolt type, length
and embedment. Titen HD®, Stainless-Steel Titen HD and SET-3G™ are
some of the retrofit anchor options. For more information, refer to our
<a href="/resources/literature/anchoring-systems-catalog"
	  ><em>Anchoring, Fastening, Restoration and Strengthening Systems for
Concrete and Masonry</em> catalog</a>.
  </li>
  <li>
  	Except for the MPBZ moment post base, post bases do not provide adequate
resistance to prevent members from rotating about the base and are therefore
not recommended for non-top-supported installations (such as fences, patio
covers, pergolas or unbraced carports). The top of the post must be restrained
from moving horizontally by some other means, e.g., by tying the roof into
a supporting structure or by adding knee bracing between the posts and
beams. (Figure 2) Alternatively, <a href="/standoffpostbases_castinplacepostbases/mpb_base/p/mpbz"
	  >see the MPBZ</a> for a post
base that provides moment resistance for columns or posts. (Figure 3)
  </li>
  <li>
	For post bases that do not attach to all four sides of the post, the post
	may be wider than the base and overhang the base in one direction (e.g., a
	6x8 post on an ABU66Z) as long as the bearing area provided by the base is
	sufficient for the post.
  </li>
  <li>
  	For applications involving the use of a post base to support a wood
beam, refer to the 
	<a href="/retrofitpostbases_postbases/abu_base/p/abu"
	  >ABU Adjustable and Standoff Post Bases product page &mdash; (Figure 4)</a
	>.
  </li>
  <li>
  	Structural composite lumber columns have sides that show either the
wide face or the edges of the lumber strands/veneers. Allowable loads
for caps and bases reflect installation into the wide face. <a href="/search?v=T-C-SCLCLM%3Arelevance&tab=literature">See technical
bulletin T-C-SCLCLM at strongtie.com</a> for load reductions due to
narrow face installations. Some products require installation of fasteners
into the wide face only.
  </li>
  <li>
	Unless otherwise noted, allowable downloads for post caps are based on the
	assumption that the wood post is at least as wide as the supported beam. For
	applications where this condition is not met (e.g., a 6x10 beam supported by
	4x4 post), the designer must evaluate the download capacity.
  </li>
  <li>
	Allowable lateral loads for post caps can only be achieved if one of the
	members, the post or beam, is supported laterally by other means. (Figure 2)
	For applications involving lateral load transfer from the beam to the
	column, the column must be designed to receive the load without rotating
	about its base (e.g., cantilevered out of the ground, diagonally braced, or
	connected at the base with a moment-resisting connector like the MPBZ post
	base).
  </li>
  <li>
	Post cap allowable loads are for a continuous beam. Unless otherwise noted,
	the beam may be spliced at the centerline of the post, and the maximum
	allowable download for each spliced beam is one half of the cap&rsquo;s
	tabulated allowable download. For CC, CCQ and CCOS caps, the download for
	each spliced beam shall also not exceed 2x the download of the other spliced
	beam. Eccentricity induced in the post by spliced beams must be evaluated by
	the designer. Tabulated uplift and lateral loads do not apply to spliced
	beam conditions. When spliced beams must be connected together to transfer
	design tension loads (lateral loads parallel to the beams), the connection
	must be by means other than the post cap.
  </li>
  <li>
	Post caps may be installed inverted for post-to-beam applications. The
	designer is responsible for evaluating the beam to ensure it is capable of
	receiving all loads applied by the post. (Figure 5)
  </li>
</ol>

<div class="row">
  <div class="col-md-4">
	<div class="image">
	  <img
		alt='Post Base with 1" Standoff'
		src="https://ssttoolbox.widen.net/content/dzahppyfop/png/CBSQ44_in.png" height="400"
	  />
	  <div class="image__caption">
		Figure 1 &mdash; Post Base with 1" Standoff
	  </div>
	</div>
	
  </div>
  <div class="col-md-4">
	<div class="image">
	  <img
		alt="Figure 2 &mdash; Typical LCE&trade; Post Cap Installation with KBS1Z Knee Bracing"
		src="https://ssttoolbox.widen.net/content/f7qzaacgel/png/KBS1Z_in_step01.png" height="400"
	  />
	  <div class="image__caption">
		Figure 2 &mdash; Typical LCE&trade; Post Cap Installation with KBS1Z Knee Bracing
	  </div>
	</div>
	
  </div>
  <div class="col-md-4">
	<div class="image">
	  <img
		alt="Figure 3 &mdash; Non-Top-Supported Post with MPBZ Moment Post Base"
		src="http://embed.widencdn.net/img/ssttoolbox/6q1sani4mb/x350px/C_MPBZ_InstIll_Ill_Instld_DesignExample-2_CY.png" height="400"
	  />
	  <div class="image__caption">
		Figure 3 &mdash; Non-Top-Supported Post with MPBZ Moment Post Base
	  </div>
	</div>
	
  </div>
</div>
<div class="row">
  <div class="col-md-4 col-md-offset-2">
	<div class="image">
	  <img
		alt="Figure 4 &mdash; ABU with Beam Installation"
		src="https://ssttoolbox.widen.net/content/vwxtqrrqjc/png/C_ABU66Z_InstIll_Ill_Instld_Beam_CY_C-C-2024-figure4.png" height="400"
	  />
	  <div class="image__caption">
		Figure 4 &mdash; ABU with Beam Installation
	  </div>
	</div>
	
  </div>
  <div class="col-md-4">
	<div class="image">
	  <img
		alt="Figure 5 &mdash; Typical (Inverted) CCQ44SDS2.5 Post-to-Beam Installation"
		src="http://embed.widencdn.net/img/ssttoolbox/sysy0fput6/x350px/C_CCQ44-SDS25_InstIll_Ill_Instld_Post-to-Beam_C0.png" height="400"
	  />
	  <div class="image__caption">
		Figure 5 &mdash; Typical (Inverted) CCQ44SDS2.5 Post-to-Beam
		Installation
	  </div>
	</div>
	
  </div>

   
	
  </div>
</div>

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