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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Nathan,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Your conclusion is the same one I have
reached in the past in this situation – the existing building clause is
the overriding factor. For existing buildings I interpret that the intent is comparing
the proposed model to what would occur if you did not change anything about the
existing building. It does contradict some of the other provisions of Appendix
G, but many of those provisions seem designed to develop that arbitrary
baseline of what would be considered “minimally compliant” for
comparison when a rating authority uses Appendix G. It gets even fuzzier when
you have an addition and renovation together since then you have an existing
building baseline for the renovated part of the building and an Appendix G
baseline for the addition.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><strong><b><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Jeremy R. Poling, LEED AP</span></font></b></strong><font
size=1 color=navy face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:navy'><br>
</span></font><font size=2 color=navy face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:navy'>Senior Sustainability Analyst<br>
Strategic Services</span></font><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><i><font size=1 color=navy face=Arial><span
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<br>
</span></font><strong><b><font size=2 color="#c75b12" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#C75B12'>EPSTEIN</span></font></b></strong><font
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<st1:PostalCode w:st="on">60661-1259</st1:PostalCode></st1:place><br>
<br>
D (312) 429-8152<br>
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</span></font><font size=1 color=navy face=Arial><span style='font-size:8.0pt;
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<br>
</span></font><font size=2 color=navy face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:navy'>We are proud to announce that our collective
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</span></font><strong><b><font size=1 color=green face=Arial><span
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Nathan Miller<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, June 03, 2009
7:00 PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] Appendix G
Interpretation: Existing Building Envelope</span></font><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I’ve
run into one of those grey areas of the Appendix G language on a project. We
are looking at a major renovation project where the shell of the building will
be upgraded. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Clearly
the baseline building will be modeled with insulation U-values that correspond
to the existing conditions of the building rather than the insulation levels
prescribed by tables 5.5-1 to 5.5-8. I think this is pretty well established.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><br>
My question is about the quantity of glazing in each case. For this project we
will be punching new glazing into the existing façade as part of the
renovations. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=msolistparagraph style='margin-bottom:12.0pt;text-indent:-.25in;
mso-list:l0 level1 lfo2'><![if !supportLists]><font size=2 face=Symbol><span
style='font-size:11.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]>Table G3.1, Section 5 states that
“Vertical fenestration areas for new buildings <i><span style='font-style:
italic'>and alterations</span></i> shall equal that in the proposed design or
40% of gross above-grade wall area, whichever is smaller.” So if we add
new windows, it would seem that the baseline building should also have those
windows, but what should their U-value be? Same U-value as the other existing
windows? Lookup the value for new glazing?<o:p></o:p></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:11.0pt;font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]>Lower in that same section of
Table G3.1 it states: “Existing Buildings. 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.” To
me, this seems to say that you would go with the existing quantity of glazing,
and the proposed model would have more glazing than the baseline, even if the
proposed does not exceed the 40% cap.<o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>There
seems to be a little contradiction between the two requirements. My inclination
is that the existing building clause overrides the requirement that the same
amount of glazing be used in each model. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Have
any of you worked on a project where this came up? Any thoughts? It seems like
this could potentially be one of those hot topics of discussion. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Franklin Gothic Demi"><span
style='font-size:12.0pt;font-family:"Franklin Gothic Demi"'>Nathan Miller</span></font><font
face="Franklin Gothic Demi"><span style='font-family:"Franklin Gothic Demi"'>,
PE, LEED</span></font><font size=1 face="Franklin Gothic Demi"><span
style='font-size:8.0pt;font-family:"Franklin Gothic Demi";position:relative;
top:-2.0pt;mso-text-raise:2.0pt'>®</span></font><font
face="Franklin Gothic Demi"><span style='font-family:"Franklin Gothic Demi"'> AP<o:p></o:p></span></font></p>
<p class=MsoNormal><i><font size=2 face="Times New Roman"><span
style='font-size:10.0pt;font-family:"Times New Roman";font-style:italic'>Senior
Energy Engineer/Mechanical Engineer<o:p></o:p></span></font></i></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt;font-family:"Times New Roman"'>direct: 206.788.4577<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt;font-family:"Times New Roman"'>fax: 206.285.7111 <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:3.0pt'><font size=1 face=Arial><span
style='font-size:8.0pt;font-family:Arial'><a href="http://www.rushingco.com/">www.rushingco.com</a><o:p></o:p></span></font></p>
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