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<title>RE: [Bldg-sim] LEED modeling requirements for existing buildings</title>
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<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>I asked the USGBC for an interpretation
(not an official CIR) on the need for rotating an existing building for
modeling purposes and the response was that the existing building does in fact
need to be rotated.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>This is their response (the &#8220;specified
analysis&#8221; refers to building rotation of an existing building):<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt;
font-family:Calibri'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt;
font-family:Calibri'>If the existing building being renovated is pursuing
LEED-NC rather than LEED-EB, then it would indeed be required to undergo the
specified analysis.&nbsp; This analysis is used to establish the baseline for
energy performance using the ASHRAE standard.&nbsp; LEED doesn&#8217;t have any
specific exemptions for existing buildings in this requirement, but if ASHRAE
has some kind of exemption, we will honor that.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt;
font-family:Calibri'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Regards,</span></font><font size=2
face=Calibri><span style='font-size:11.0pt;font-family:Calibri'><o:p></o:p></span></font></p>

<div>

<p><b><i><font size=2 color=navy face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:navy;font-weight:bold;font-style:italic'>Jeffrey G.
Ross-Bain, PE, LEED</span></font></i></b><font color=blue><span
style='color:blue'> <br>
</span></font><font size=1 color=blue face=Arial><span style='font-size:7.5pt;
font-family:Arial;color:blue'>Smith Dalia Architects</span></font><font
color=blue><span style='color:blue'> <br>
</span></font><font size=1 color=blue face=Arial><span style='font-size:7.5pt;
font-family:Arial;color:blue'>621 North Ave NE</span></font><font color=blue><span
style='color:blue'> <br>
</span></font><font size=1 color=blue face=Arial><span style='font-size:7.5pt;
font-family:Arial;color:blue'>Suite C-140</span></font><font color=blue><span
style='color:blue'> <br>
</span></font><font size=1 color=blue face=Arial><span style='font-size:7.5pt;
font-family:Arial;color:blue'>Atlanta, GA, 30308</span></font><font color=blue><span
style='color:blue'> <br>
</span></font><font size=1 color=blue face=Arial><span style='font-size:7.5pt;
font-family:Arial;color:blue'>404-892-2443</span></font><font color=blue><span
style='color:blue'> <br>
<a href="http://www.smithdalia.com"><font size=1 face=Tahoma><span
style='font-size:7.5pt;font-family:Tahoma'>www.smithdalia.com</span></font></a>
<o:p></o:p></span></font></p>

<p><font size=5 color=green face=Webdings><span lang=EN-GB style='font-size:
18.0pt;font-family:Webdings;color:green'>P</span></font><font color=black><span
lang=EN-GB style='color:black'> </span></font><font size=2 color=green
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:green'>Build Green...Save Time</span></font><o:p></o:p></p>

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face="Times New Roman"><span style='font-size:12.0pt'>

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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>Michael Tillou<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, August 21, 2008
9:15 AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'Jay Keazer'<br>
<b><span style='font-weight:bold'>Cc:</span></b> 'Eric O'Neill';
bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] Spam:Re:
LEED modeling requirements forexistingbuildings</span></font><o:p></o:p></p>

</div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Jay,</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>It is my understanding that that is the
correct interpretation.&nbsp; </span></font><o:p></o:p></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

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<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>However, I don't&nbsp;think Eric's
interpretation that the baseline rotation requirement does not&nbsp;apply to
existing buildings is correct.&nbsp;Let me explain why I disagree.&nbsp; </span></font><o:p></o:p></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

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<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Requirement f in Part 5 of Table 3.1
refers specifically to the <em><i><font face=Arial><span style='font-family:
Arial'>baseline building design</span></font></i></em> (note the italics which
signify that a phrase or word is defined in&nbsp;Section 3 of the Standard)
while Requirement a in Part 5 of Table 3.1 refers specifically to the <em><i><font
face=Arial><span style='font-family:Arial'>baseline building performance</span></font></i></em>
(again in italics).&nbsp; The <em><i><font face=Arial><span style='font-family:
Arial'>baseline building design</span></font></i></em> is not the same as
the&nbsp;<em><i><font face=Arial><span style='font-family:Arial'>baseline
building performance</span></font></i></em> and therefore Requirement f. cannot
supercede Requirement a in any case.&nbsp;&nbsp;</span></font><o:p></o:p></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

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<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>One last comment about the&nbsp;equal
window distribution.&nbsp;&nbsp;ASHRAE&nbsp; 90.1-2004 Addendum a removes the
equal distribution requirement for windows in the baseline.&nbsp; If you're
working on a LEED project I suggest you consider adopting Addendum a to avoid
this requirement.&nbsp; USGBC has allowed the use of ASHRAE 90.1-2004
addenda.&nbsp; If you do decide to adopt Addendum a remember that USGBC
requires that you&nbsp;incorporate&nbsp;all the changes included in the
Addenddum.&nbsp; Addendum a has a total of eight changes to Appendix G, most
important of which are the changes to the calculation of the baseline HVAC
system types.</span></font><o:p></o:p></p>

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<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

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<div>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>regards,</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

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<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Mike</span></font><o:p></o:p></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

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<p class=MsoNormal><font size=2 face="Arial Black"><span style='font-size:10.0pt;
font-family:"Arial Black"'>Michael Tillou, PE, LEED</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=2 face="Arial Black"><span style='font-size:10.0pt;
font-family:"Arial Black"'>Tillou Engineering, LLC</span></font><o:p></o:p></p>

<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=1
  face="Arial Black"><span style='font-size:7.5pt;font-family:"Arial Black"'>Williamstown</span></font></st1:City><font
 size=1 face="Arial Black"><span style='font-size:7.5pt;font-family:"Arial Black"'>,
 <st1:State w:st="on">MA</st1:State> <st1:PostalCode w:st="on">01267</st1:PostalCode></span></font></st1:place><o:p></o:p></p>

<p class=MsoNormal><font size=1 face="Arial Black"><span style='font-size:7.5pt;
font-family:"Arial Black"'>P: 413-458-9870</span></font>&nbsp;<font size=1
face="Arial Black"><span style='font-size:7.5pt;font-family:"Arial Black"'>C: 413-652-1087</span></font><o:p></o:p></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

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face="Times New Roman"><span style='font-size:12.0pt'>

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<p class=MsoNormal style='margin-bottom:12.0pt'><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>Jay Keazer<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, August 19, 2008
10:42 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Eric O'Neill; Mark Sorensen;
bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] Spam:Re:
LEED modeling requirements for existingbuildings</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>What about the
baseline envelope assemblies? &nbsp;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.&nbsp; &nbsp;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>In the same column
of Table G3.1, requirement (b) states that &#8220;Opaque assemblies used for <i><span
style='font-style:italic'>alterations</span></i> shall conform with 5.1.3&#8221;
and requirement (c) states that &#8220;The fenestration areas for envelope <i><span
style='font-style:italic'>alterations</span></i> shall reflect the limitations
on area, U-factor, and SHGC as described in 5.1.3.&#8221;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>5.1.3 states that &#8220;Alterations
to the building envelope shall comply with the requirements of Section 5 for
insulation, air leakage, and fenestration <b><span style='font-weight:bold'>applicable
to those specific portions of the building that are being altered</span></b>.&#8221;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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.&nbsp; However, the walls are not being altered, so I can use the existing
construction for the baseline walls.&nbsp; <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Does anybody have a
different interpretation?<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Thanks!<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><b><i><font size=2 color="#1f497d" face="Times New Roman"><span
style='font-size:10.0pt;color:#1F497D;font-weight:bold;font-style:italic'>Jay
Keazer,&nbsp; EI</span></font></i></b><font color="#1f497d"><span
style='color:#1F497D'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face="Times New Roman"><span
style='font-size:10.0pt;color:#1F497D'>Energy Engineer</span></font><font
color="#1f497d"><span style='color:#1F497D'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face="Times New Roman"><span
style='font-size:10.0pt;color:#1F497D'>TME, Inc.</span></font><font
color="#1f497d"><span style='color:#1F497D'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face="Times New Roman"><span
style='font-size:10.0pt;color:#1F497D'>2039 N Green <st1:Street w:st="on"><st1:address
 w:st="on">Acres Road</st1:address></st1:Street></span></font><font
color="#1f497d"><span style='color:#1F497D'><o:p></o:p></span></font></p>

<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=2
  color="#1f497d" face="Times New Roman"><span style='font-size:10.0pt;
  color:#1F497D'>Fayetteville</span></font></st1:City><font size=2
 color="#1f497d"><span style='font-size:10.0pt;color:#1F497D'>, <st1:State
 w:st="on">AR</st1:State>&nbsp; <st1:PostalCode w:st="on">72703</st1:PostalCode></span></font></st1:place><font
color="#1f497d"><span style='color:#1F497D'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=1 color="#1f497d" face=Arial><span
style='font-size:7.5pt;font-family:Arial;color:#1F497D'>&nbsp;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=1 color="#1f497d" face="Times New Roman"><span
style='font-size:7.5pt;color:#1F497D'>ph&nbsp;&nbsp; 479.521.8634</span></font><font
color="#1f497d"><span style='color:#1F497D'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=1 color="#1f497d" face="Times New Roman"><span
style='font-size:7.5pt;color:#1F497D'>fax&nbsp; 479.521.1014<o:p></o:p></span></font></p>

<p class=MsoNormal><u><font size=1 color=blue face="Times New Roman"><span
style='font-size:7.5pt;color:blue'><a href="mailto:email@tmecorp.com">jkeazer@tmecorp.com</a></span></font></u><u><font
size=2 color="#1f497d" face=Calibri><span style='font-size:11.0pt;font-family:
Calibri;color:#1F497D'><o:p></o:p></span></font></u></p>

<p class=MsoNormal><u><font size=1 color=blue face="Times New Roman"><span
style='font-size:7.5pt;color:blue'><a href="http://www.tmecorp.com/">www.tmecorp.com</a><o:p></o:p></span></font></u></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>

<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>Eric O'Neill<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, August 14, 2008
3:16 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Mark Sorensen;
bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Spam:Re: [Bldg-sim] LEED
modeling requirements for existing buildings<o:p></o:p></span></font></p>

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</div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p><font size=2 color=blue face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:blue'>Mark,</span></font> <br>
<font size=2 color=blue face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:blue'>Under ASHRAE 90.1 Appendix G, Table G3.1, Section 5,
&quot;Baseline Building Performance&quot; column, requirement (f) (take a
breath&#8230;) it states that &quot;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&quot;. 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></font><o:p></o:p></p>

<p><b><i><font size=3 color=navy face=Garamond><span style='font-size:12.0pt;
font-family:Garamond;color:navy;font-weight:bold;font-style:italic'>Eric
O'Neill</span></font></i></b> <br>
<font size=2 color=gray face=Garamond><span style='font-size:10.0pt;font-family:
Garamond;color:gray'>Mechanical Engineer</span></font> <br>
<font size=2 color=gray face=Garamond><span style='font-size:10.0pt;font-family:
Garamond;color:gray'>Energy Division - Michaels Engineering</span></font> <o:p></o:p></p>

<p><st1:address w:st="on"><st1:Street w:st="on"><font size=1 color=gray
  face=Arial><span style='font-size:7.5pt;font-family:Arial;color:gray'>811
  Monitor St. Ste 100</span></font></st1:Street> <br>
<st1:City w:st="on"><font size=1 color=gray face=Arial><span style='font-size:
  7.5pt;font-family:Arial;color:gray'>La Crosse</span></font></st1:City><font
 size=1 color=gray face=Arial><span style='font-size:7.5pt;font-family:Arial;
 color:gray'>, <st1:State w:st="on">WI</st1:State> <st1:PostalCode w:st="on">54603</st1:PostalCode></span></font></st1:address>
<br>
<font size=1 color=gray face=Arial><span style='font-size:7.5pt;font-family:
Arial;color:gray'>v: 608-785-1900 x521</span></font> <br>
<font size=1 color=gray face=Arial><span style='font-size:7.5pt;font-family:
Arial;color:gray'>f: 608-784-2270</span></font> <br>
<font size=1 color=gray face=Arial><span style='font-size:7.5pt;font-family:
Arial;color:gray'>elo@michaelsengineering.com</span></font> <br>
<a href="http://www.michaelsengineering.com"><font size=1 face=Arial><span
style='font-size:7.5pt;font-family:Arial'>http://www.michaelsengineering.com</span></font></a>
<o:p></o:p></p>

<p><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'> Mark Sorensen [</span></font><a
href="mailto:DEnergyServices@comcast.net"><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>mailto:DEnergyServices@comcast.net</span></font></a><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>]<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, August 14, 2008
10:40 AM<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] LEED modeling
requirements for existing buildings<br>
</span></font><br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>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&#8217;m not
sure what to think about equal redistribution of the glass areas.</span></font>
<o:p></o:p></p>

<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Mark
Sorensen <br>
Diversified Energy Services <br>
<st1:Street w:st="on"><st1:address w:st="on">5890 E. Pontaluna Rd.</st1:address></st1:Street>
<br>
<st1:place w:st="on"><st1:City w:st="on">Fruitport</st1:City>, <st1:State
 w:st="on">MI</st1:State> <st1:PostalCode w:st="on">49415</st1:PostalCode></st1:place>
<o:p></o:p></span></font></p>

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