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<title>RE: [Bldg-sim] LEED modeling requirements for existing buildings</title>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>What about the baseline envelope assemblies? As an example
I have an existing building where the windows are being replaced and insulation
is being sprayed on the outside of a built up roof. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In the same column of Table G3.1, requirement (b) states that “Opaque
assemblies used for <i>alterations</i> shall conform with 5.1.3” and
requirement (c) states that “The fenestration areas for envelope <i>alterations</i>
shall reflect the limitations on area, U-factor, and SHGC as described in 5.1.3.”<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>5.1.3 states that “Alterations to the building envelope
shall comply with the requirements of Section 5 for insulation, air leakage,
and fenestration <b>applicable to those specific portions of the building that
are being altered</b>.”<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>My interpretation is: because the windows and roof are being
altered, I have to use the appropriate U-factors and SHGC from the tables for
the baseline windows and roof. However, the walls are not being altered,
so I can use the existing construction for the baseline walls. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Does anybody have a different interpretation?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><i><span style='font-size:10.0pt;color:#1F497D'>Jay Keazer,
EI</span></i></b><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>Energy Engineer</span><span
style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>TME, Inc.</span><span
style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>2039 N Green
Acres Road</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>Fayetteville,
AR 72703</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;color:#1F497D'>ph
479.521.8634</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;color:#1F497D'>fax
479.521.1014<o:p></o:p></span></p>
<p class=MsoNormal><u><span style='font-size:7.5pt;color:blue'><a
href="mailto:email@tmecorp.com">jkeazer<span style='color:blue'>@tmecorp.com</span></a></span></u><u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></u></p>
<p class=MsoNormal><u><span style='font-size:7.5pt;color:blue'><a
href="http://www.tmecorp.com/"><span style='color:blue'>www.tmecorp.com</span></a><o:p></o:p></span></u></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Eric
O'Neill<br>
<b>Sent:</b> Thursday, August 14, 2008 3:16 PM<br>
<b>To:</b> Mark Sorensen; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Spam:Re: [Bldg-sim] LEED modeling requirements for existing
buildings<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Mark,</span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Under
ASHRAE 90.1 Appendix G, Table G3.1, Section 5, "Baseline Building
Performance" column, requirement (f) (take a breath…) it states that
"For existing building envelopes, the baseline building design shall
reflect existing conditions prior to any revisions that are part of the scope
of work being evaluated". So the rotation doesn't apply to you. Also, I
interpret that to mean the windows don't need to be redistributed either. Hope
that helps!</span><o:p></o:p></p>
<p><b><i><span style='font-family:"Garamond","serif";color:navy'>Eric O'Neill</span></i></b>
<br>
<span style='font-size:10.0pt;font-family:"Garamond","serif";color:gray'>Mechanical
Engineer</span> <br>
<span style='font-size:10.0pt;font-family:"Garamond","serif";color:gray'>Energy
Division - Michaels Engineering</span> <o:p></o:p></p>
<p><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>811
Monitor St. Ste 100</span> <br>
<span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>La
Crosse, WI 54603</span> <br>
<span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>v:
608-785-1900 x521</span> <br>
<span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>f:
608-784-2270</span> <br>
<span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>elo@michaelsengineering.com</span>
<br>
<a href="http://www.michaelsengineering.com"><span style='font-size:7.5pt;
font-family:"Arial","sans-serif"'>http://www.michaelsengineering.com</span></a>
<o:p></o:p></p>
<p><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Mark Sorensen [</span><a
href="mailto:DEnergyServices@comcast.net"><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>mailto:DEnergyServices@comcast.net</span></a><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>]<br>
<b>Sent:</b> Thursday, August 14, 2008 10:40 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] LEED modeling requirements for existing buildings<br>
</span><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>When modeling
an existing building, is required to calculate the proposed building window to
wall ratio and equally redistribute the glass area to the baseline building and
prepare models for the four rotation exposures? My take is that for a proposed
existing building, there is not an opportunity to position the building to the
most advantageous exposure and you could end up being penalized if the baseline
energy use is averaged for all rotations but I have not been able to find any
reference in LEED or ASHRAE to support this. I’m not sure what to think
about equal redistribution of the glass areas.</span> <o:p></o:p></p>
<p>Mark Sorensen <br>
Diversified Energy Services <br>
5890 E. Pontaluna Rd. <br>
Fruitport, MI 49415 <o:p></o:p></p>
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