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<p>This might be useful. In this paper, the cavity wall was tested on stud wall and
<span style="text-decoration: underline;">not on masonry walls</span>. Benefit of applying the cavity wall strategy resulted in adjusting the outside heat gain/loss film coefficient by convection from the surface while reduced the solar absorptance acted as
a shading element to the existing wall. A 5.8% saving in cooling load in a hot-arid climate of Tucson Arizona was achieved.</p>
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<p>To get an equivalent effective R-Value, sometimes you may run the simulation again, increasing the R-value of the existing wall until you achieve the 5.8% reduction in cooling (not sure if it works in all cases?)
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" color="#000000" face="Calibri, sans-serif"><b>From:</b> Bldg-sim <bldg-sim-bounces@lists.onebuilding.org> on behalf of Michael Hsueh <mhsueh@integralgroup.com><br>
<b>Sent:</b> Friday, March 4, 2016 2:23 PM<br>
<b>To:</b> Keith Swartz; Jones, Christopher; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Vented cavity behind brick or precast panels and effective R-value</font>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">John Straube has a white paper floating out there specifically about the reduction of insulation R-value as a function of air circulation in cavities. I’d go
check out the BSC website (or RDH, which they’re a part of now) to see if it’s available (or email them to point you to that publication).</span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#7F7F7F" lang="EN-CA">Michael Hsueh
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<b>Integral Group </b>| </span><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#7F7F7F">T 510.663.2070 ext 2041 | D 510.457.0141</span><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#7F7F7F" lang="EN-CA"></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#7F7F7F"><a href="http://www.integralgroup.com/"><span style="color:#7F7F7F">integralgroup.com</span></a> |</span><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#7F7F7F">
</span><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"><a href="mailto:mhsueh@integralgroup.com" target="_blank"><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#7F7F7F">mhsueh@integralgroup.com</span></a></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> Bldg-sim [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Keith Swartz<br>
<b>Sent:</b> Friday, March 04, 2016 1:16 PM<br>
<b>To:</b> Jones, Christopher <Christopher.r.Jones@wspgroup.com>; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Vented cavity behind brick or precast panels and effective R-value</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial",sans-serif">Christopher,</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial",sans-serif">The ASHRAE Handbook has a section about thermal resistance of air spaces. See the 2013 Fundamentals Handbook starting on p. 26.12. Is that what you are looking for?</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:black">Keith Swartz, PE
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</span><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:black">Senior Energy Engineer</span></p>
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<p class="MsoNormal" style="line-height:110%"><span style="font-size:10.0pt; line-height:110%; font-family:"Arial",sans-serif; color:black">608.210.7123 seventhwave.org</span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> Jones, Christopher [<a href="mailto:Christopher.r.Jones@wspgroup.com">mailto:Christopher.r.Jones@wspgroup.com</a>]
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<b>Sent:</b> Friday, March 04, 2016 12:52 PM<br>
<b>To:</b> <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> [Bldg-sim] Vented cavity behind brick or precast panels and effective R-value</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#1F497D">Is anyone aware of any analyses of the effective insulation properties of brick or precast veneer with a vented air space? I assume the air in that cavity is
moving slowly but it isn’t completely still therefore you can’t include all of the insulative properties of those two layers on the outside of a wall?</span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#1C467A">Christopher Jones,</span></b><b><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#1F497D">
</span></b><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#1F497D">P.Eng.<i>
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