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"urn:schemas-microsoft-com:" xmlns:st = ""><HEAD><TITLE>RE: [Bldg-sim] LEED modeling requirements for existing buildings</TITLE>
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<DIV dir=ltr align=left><SPAN class=156023512-21082008><FONT face=Arial
color=#0000ff size=2>Jay,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156023512-21082008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=156023512-21082008><FONT face=Arial
color=#0000ff size=2>It is my understanding that that is the correct
interpretation. </FONT></SPAN></DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff
size=2>However, I don't think Eric's interpretation that the baseline
rotation requirement does not apply to existing buildings is
correct. Let me explain why I disagree. </FONT></SPAN></DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff
size=2>Requirement f in Part 5 of Table 3.1 refers specifically to the
<EM>baseline building design</EM> (note the italics which signify that a phrase
or word is defined in Section 3 of the Standard) while Requirement a in
Part 5 of Table 3.1 refers specifically to the <EM>baseline building
performance</EM> (again in italics). The <EM>baseline building design</EM>
is not the same as the <EM>baseline building performance</EM> and therefore
Requirement f. cannot supercede Requirement a in any
case. </FONT></SPAN></DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff size=2>One
last comment about the equal window distribution. ASHRAE
90.1-2004 Addendum a removes the equal distribution requirement for windows in
the baseline. If you're working on a LEED project I suggest you consider
adopting Addendum a to avoid this requirement. USGBC has allowed the use
of ASHRAE 90.1-2004 addenda. If you do decide to adopt Addendum a remember
that USGBC requires that you incorporate all the changes included in
the Addenddum. 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.</FONT></SPAN></DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=156023512-21082008></SPAN><SPAN class=156023512-21082008><FONT
face=Arial color=#0000ff size=2>regards,</FONT></SPAN></DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff
size=2>Mike</FONT></SPAN></DIV>
<DIV><SPAN class=156023512-21082008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=156023512-21082008>
<DIV align=left><FONT face="Arial Black" size=2>Michael Tillou, PE,
LEED</FONT></DIV>
<DIV align=left><FONT face="Arial Black" size=2>Tillou Engineering,
LLC</FONT></DIV>
<DIV align=left><FONT face="Arial Black" size=1>Williamstown, MA
01267</FONT></DIV>
<DIV align=left><FONT face="Arial Black" size=1>P:
413-458-9870</FONT> <FONT face="Arial Black" size=1>C:
413-652-1087</FONT></DIV></SPAN></DIV>
<DIV dir=ltr align=left><BR></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Jay
Keazer<BR><B>Sent:</B> Tuesday, August 19, 2008 10:42 AM<BR><B>To:</B> Eric
O'Neill; Mark Sorensen; bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> Re:
[Bldg-sim] Spam:Re: LEED modeling requirements for
existingbuildings<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Does
anybody have a different interpretation?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Thanks!<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><B><I><SPAN style="FONT-SIZE: 10pt; 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: 10pt; COLOR: #1f497d">Energy
Engineer</SPAN><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #1f497d">TME,
Inc.</SPAN><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; 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: 10pt; 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; COLOR: #1f497d; FONT-FAMILY: 'Arial','sans-serif'"> <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: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><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: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">Mark,</SPAN>
<BR><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">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="COLOR: navy; FONT-FAMILY: 'Garamond','serif'">Eric
O'Neill</SPAN></I></B> <BR><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: 'Garamond','serif'">Mechanical
Engineer</SPAN> <BR><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: 'Garamond','serif'">Energy
Division - Michaels Engineering</SPAN> <o:p></o:p></P>
<P><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: 'Arial','sans-serif'">811
Monitor St. Ste 100</SPAN> <BR><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: 'Arial','sans-serif'">La
Crosse, WI 54603</SPAN> <BR><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: 'Arial','sans-serif'">v:
608-785-1900 x521</SPAN> <BR><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: 'Arial','sans-serif'">f:
608-784-2270</SPAN> <BR><SPAN
style="FONT-SIZE: 7.5pt; COLOR: gray; FONT-FAMILY: 'Arial','sans-serif'">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: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> Mark Sorensen
[</SPAN><A href="mailto:DEnergyServices@comcast.net"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">mailto:DEnergyServices@comcast.net</SPAN></A><SPAN
style="FONT-SIZE: 10pt; 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: 10pt; 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></DIV></BODY></HTML>