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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Ken,<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">Attached is thread from 9 months back where I reported being corrected to use actual envelope constructions for 3 consecutive projects (reviewed simultaneously),
and also to remove baseline rotations. <o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">My understanding since then hasn’t altered, though I’m uncertain whether this is spelled out anywhere explicitly with regard to LEED’s review policies: If your building’s footprint
isn’t changing by more than 50%, for modeling purposes at least the project is classified a “retrofit” rather than new construction, and so the guidance/requirements become to match pre-existing envelope constructions for the baseline model (and to not rotate),
in accordance with Table G3.1 language on the point. I haven’t run into a similar LEED review scenario since that time however – would be great to hear any others’ experiences that would reinforce (or refute) this understanding!</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The following CIR (for LEED for homes) evokes the same Table G3.1 language that I think was cited for my case:<o:p></o:p></span></p>
<p style="text-indent:.5in"><span style="font-family:"Calibri","sans-serif"">Made on: 08/03/2009 | LEED Interpretation</span>
<o:p></o:p></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri","sans-serif"">Prerequisite/Credit: EAc1: Optimize Energy Performance</span>
<br>
<span style="font-family:"Calibri","sans-serif"">Primary Rating System: Homesv2008</span>
<o:p></o:p></p>
<p style="text-indent:.5in"><span style="font-family:"Calibri","sans-serif"">Click here to view the full entry:
<a href="http://www.usgbc.org/leed-interpretations?keys=2673">http://www.usgbc.org/leed-interpretations?keys=2673</a></span>
<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Of related interest: LEED at one point made the interpretation of “if you touch it, model minimum baseline requirements instead of existing conditions,” but
subsequently retracted that interpretation and declared this incorrect. This is documented here:
<o:p></o:p></span></p>
<p style="text-indent:.5in"><span style="font-family:"Calibri","sans-serif"">Made on: 02/20/2009 | LEED Interpretation</span>
<o:p></o:p></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri","sans-serif"">Prerequisite/Credit: EAp2: Minimum Energy Performance</span>
<br>
<span style="font-family:"Calibri","sans-serif"">Primary Rating System: NCv2.2</span>
<o:p></o:p></p>
<p style="text-indent:.5in"><span style="font-family:"Calibri","sans-serif"">Click here to view the full entry:
<a href="http://www.usgbc.org/leed-interpretations?keys=5182">http://www.usgbc.org/leed-interpretations?keys=5182</a></span>
<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">I dug up these two CIR’s here– you may find a more directly applicable CIR if you’ve got the time to shuffle through the search results =):
<a href="http://www.usgbc.org/leed-interpretations">http://www.usgbc.org/leed-interpretations</a><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">Best regards,<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">~Nick<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"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><img border="0" width="119" height="37" id="Picture_x0020_1" src="cid:image001.jpg@01CF44DB.F19E6550" alt="cid:489575314@22072009-0ABB"></span><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Stylus BT","sans-serif";color:#2D4D5E">NICK CATON, P.E.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900">SENIOR ENGINEER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">Smith & Boucher Engineers</span><span style="font-size:7.5pt;color:#CC9900"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">25501 west valley parkway, suite 200<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">olathe, ks 66061<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">direct 913.344.0036<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">fax 913.345.0617<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style="font-size:10.0pt;color:blue">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue">
</span></u><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"><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>Ken Pilcher<br>
<b>Sent:</b> Thursday, March 20, 2014 11:32 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org; Ken Pilcher<br>
<b>Subject:</b> [Bldg-sim] Existing Envelope for LEED v3<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><em><span style="font-family:"Calibri","sans-serif"">Any help regarding the reuse of an existing building LEED simulation would be helpful. We are working on an existing building that was a warehouse and is now an office building. The existing
shell was un-insulated concrete block walls and an un-insulated metal roof with metal joists. Using the ASHRAE 90.1 guidelines for envelope allows the use of existing envelope, but in the climate zone at-hand our proposed envelope alone represents a 30% energy
cost savings. Our question is whether there is an exception or limitation to using existing the envelope if a building use is changed, ours is now an office.</span></em><span style="font-family:"Calibri","sans-serif""><br>
<br>
Thanks,<br>
<br>
Ken<o:p></o:p></span></p>
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