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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Nick and Daniel,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>On a high level, Appendix G baseline is a virtual building configured as described in Appendix G and compliant with requirements of 90.1 applicable to this configuration. In order to comply with 90.1, major renovation projects are generally not required to retrofit envelope so that it meets the current requirements of ASHRAE 90.1, which explains provision of </span><span style='color:#1F497D'>G3.1.5.f</span><span style='color:#1F497D'> to use existing envelope in the baseline. However, when renovation involves change in space conditioning category, e.g. an old semiheated warehouse is converted into an office building, 90.1 requires that all systems including envelope are brought into compliance with the current provisions:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>4.1.1.5 Changes in Space Conditioning. </span></b><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Whenever<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>unconditioned </span></i><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>or <i>semiheated </i>spaces in a building are converted<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>to <i>conditioned spaces</i>, such <i>conditioned spaces </i>shall<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>be brought into compliance with all the applicable requirements<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>of this standard that would apply to the building envelope,<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>heating, ventilating, air-conditioning, service water<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>heating, power, lighting, and other systems and equipment of<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>the space as if the building were new.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>It looks like Daniel’s project is subject to this requirement. I don’t know what’s LEED policy on that, but a few modeling-based incentive programs that I am involved with do not allow using existing condition as envelope baseline for projects that involve changes in space conditioning. Otherwise they get incentive windfall for doing what they are required to do in order to meet energy code (in states where energy code is aligned with 90.1). For a LEED project, I would make sure that systems other than envelope (e.g. HVAC, lighting, etc.) are efficient enough to meet EAc1 target in case envelope baseline is questioned by LEED reviewers. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Maria<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><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"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Nick Caton<br><b>Sent:</b> Tuesday, February 07, 2012 10:36 AM<br><b>To:</b> Daniel Kaler; equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] 90.1 Baseline Envelope Interpretation<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Hey Daniel,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Hmm – I have never been called out one way or the other regarding existing envelopes under formal review so I can’t say with certainty… I’ll agree your situation seems tricky!<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>There’s a line within Table G3.1, section 5 baseline column, that also reads “Opaque assemblies used for <i>alterations</i> shall conform with Section 5.1.3.” “<i>Alterations”</i> is a vaguely written glossary term which could be read to apply to your wall upgrades as described.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>5.1.3 broadly says all requirements in section 5 for insulation, air leakage and fenestrations apply to the <i>alterations</i>. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Reading that together with G3.1.5.f, your baseline <i>alteration</i> walls should reflect the pre-existing building envelope in every regard, excepting any prescriptive/mandatory requirements of section 5 regarding insulation, air leakage and fenestrations… This assumes none of the 5.1.3 exceptions apply. This interpretation would permit things like WWR and infiltration rates to differ from the proposed envelope.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I would not advise going hog-wild with differing infiltration rates however. Garage doors may generally leak more than the proposed construction – but use and document conservative numbers that make sense for an “always closed” door (with weatherseal if applicable) per the mandatory infiltration requirements. If you assume the baseline doors are regularly opened by mechanics in the baseline, you’re straying from the “same occupants, same scheduling” theme repeated through the rest of Appendix G.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Hope those thoughts help!<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>~Nick<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'><img width=119 height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CCE588.662CB260" alt="cid:489575314@22072009-0ABB"></span><b><span style='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'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;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;color:#CC9900'>SENIOR ENGINEER<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>Smith & Boucher Engineers</span><span style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west valley parkway, suite 200<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe, ks 66061<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913.344.0036<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913.345.0617<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span style='font-size:10.0pt;color:blue'> </span></u><span style='color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><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"'> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> <a href="mailto:[mailto:equest-users-bounces@lists.onebuilding.org]">[mailto:equest-users-bounces@lists.onebuilding.org]</a> <b>On Behalf Of </b>Daniel Kaler<br><b>Sent:</b> Monday, February 06, 2012 4:40 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] 90.1 Baseline Envelope Interpretation<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-family:"Optima LT"'>Hi All,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>I am having trouble fully comprehending ASHRAE 90.1 Appendix G, referring to existing building envelopes. The building I am modeling was previously a maintenance shop with practically zero insulation. In addition to the basic building envelope, the southern facing exposure is essentially 4 large garage doors.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>The entire envelope was gutted and replaced with a brick/concrete wall and corresponding insulation. In addition to the envelope upgrade, the entire interior was remodeled to be utilized as an office building. Appendix G leads to me to believe that I should be modeling the building envelope as if the garage doors are still in place. i.e. the offices will have a garage door modeled as the wall type with a significant amount of infiltration. This seems counter-intuitive to me, but I want to verify that I am doing it correctly.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>Any input would be helpful, Thanks.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-family:"Optima LT";color:#1A2A6C'>Daniel Kaler<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Optima LT";color:#1A2A6C'>Energy Engineer, EIT<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:6.0pt;font-family:"Optima LT";color:#1A2A6C'><o:p> </o:p></span></b></p><div style='border:none;border-top:double #002060 2.25pt;padding:1.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:6.0pt;font-family:"Optima LT";color:#1A2A6C'><o:p> </o:p></span></b></p></div><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt;font-family:"Optima LT";color:#1A2A6C'>MEP ASSOCIATES<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:10.0pt;font-family:"Optima LT";color:black'>engineers | consultants | commissioning<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:8.0pt;font-family:"Optima LT";color:black'>MEP Associates, LLC | 2720 Arbor Court | Eau Claire, WI 54701<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:8.0pt;font-family:"Optima LT";color:black'>Phone: 715.832.5680 | Fax: 715.832.5668 |www.mepassociates.com</span><span style='font-size:8.0pt;font-family:"Optima LT"'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>