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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Do any of you know the reasoning behind why the 2006 edition
of the International Energy Conservation Code (IECC) removed the requirement
for insulation for unheated slabs for some climate zones? I have done a few
energy models recently with slab insulation as a potential energy saving
measure. The numbers were very small, which was expected, but what surprised me
was that the savings were negative. Adding insulation to the slab actually <u>increased</u>
annual energy usage (very slightly). Cooling was unaffected, but fan energy was
slightly higher during the heating season. My quick search for research reports
or other insights to explain this came up empty. Do any of you have any
thoughts? Are the results so insignificant that the differences I am seeing in
the calculations could just be considered “noise”?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>_____________________</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><ns0:PersonName w:insAuthor="Keith Swartz"
w:insDate="2009-01-22T14:34:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2009-01-22T14:34:00Z">Keith Swartz</ns0:PersonName>, P.E., LEED
AP<br>
Energy Engineer / Senior Project Manager<br>
<ns0:PlaceName w:insAuthor="Keith Swartz" w:insDate="2009-01-22T14:34:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2009-01-22T14:34:00Z"><st1:PlaceName
w:st="on">Energy</st1:PlaceName></ns0:PlaceName> <ns0:PlaceType
w:insAuthor="Keith Swartz" w:insDate="2009-01-22T14:34:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2009-01-22T14:34:00Z"><st1:PlaceType
w:st="on">Center</st1:PlaceType></ns0:PlaceType> of <ns0:place
w:insAuthor="Keith Swartz" w:insDate="2009-01-22T14:34:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2009-01-22T14:34:00Z"><ns0:State
w:insAuthor="Keith Swartz" w:insDate="2009-01-22T14:34:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2009-01-22T14:34:00Z"><st1:State
w:st="on"><st1:place w:st="on">Wisconsin</st1:place></st1:State><br>
</ns0:State></ns0:place><ns0:Street w:insAuthor="Keith Swartz"
w:insDate="2009-01-22T14:34:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2009-01-22T14:34:00Z"><ns0:address w:insAuthor="Keith Swartz"
w:insDate="2009-01-22T14:34:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2009-01-22T14:34:00Z"><st1:Street w:st="on"><st1:address w:st="on">455
Science Drive, Suite 200</st1:address></st1:Street><br>
</ns0:address></ns0:Street><ns0:place w:insAuthor="Keith Swartz"
w:insDate="2009-01-22T14:34:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2009-01-22T14:34:00Z"><ns0:City w:insAuthor="Keith Swartz"
w:insDate="2009-01-22T14:34:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2009-01-22T14:34:00Z"><st1:place w:st="on"><st1:City w:st="on">Madison</st1:City></ns0:City></st1:place>,
<ns0:State w:insAuthor="Keith Swartz" w:insDate="2009-01-22T14:34:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2009-01-22T14:34:00Z"><st1:State
w:st="on">WI</st1:State></ns0:State> <ns0:PostalCode w:insAuthor="Keith Swartz"
w:insDate="2009-01-22T14:34:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2009-01-22T14:34:00Z"><st1:PostalCode w:st="on">53711</st1:PostalCode><br>
</ns0:PostalCode></ns0:place>Phone: 608.238.8276 x123<br>
Fax: 608.238.0523<br>
Email: <a href="mailto:kswartz@ecw.org">kswartz@ecw.org</a><br>
Web: <a href="http://www.ecw.org" title="http://www.ecw.org/">www.ecw.org</a><br>
<br>
<b><span style='font-weight:bold'><ns0:place w:insAuthor="Keith Swartz"
w:insDate="2009-01-22T14:34:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2009-01-22T14:34:00Z"><ns0:PlaceName w:insAuthor="Keith Swartz"
w:insDate="2009-01-22T14:34:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2009-01-22T14:34:00Z">Energy</ns0:PlaceName> <ns0:PlaceType
w:insAuthor="Keith Swartz" w:insDate="2009-01-22T14:34:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2009-01-22T14:34:00Z">Center</ns0:PlaceType>
<ns0:PlaceType w:insAuthor="Keith Swartz" w:insDate="2009-01-22T14:34:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2009-01-22T14:34:00Z">University<br>
</ns0:PlaceType></ns0:place></span></b><i><span style='font-style:italic'>Your
gateway to sustainable design training and online education programs.<br>
</span></i></span></font><a href="http://www.ecw.org/university/"
title="http://www.ecw.org/university/"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><span
title="http://www.ecw.org/university/">www.ecw.org/university/</span></span></font></a><o:p></o:p></p>
</div>
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12.0pt'><o:p> </o:p></span></font></p>
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