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<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>
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<p class="MsoNormal"><span style="color:#1F497D"><img width="119" height="37" id="Picture_x0020_1" src="cid:image001.jpg@01CCE572.0AD4EA60" 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.</span></b><b><span style="font-size:12.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E"><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>
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<p class="MsoNormal"><span style="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""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Daniel Kaler<br>
<b>Sent:</b> Monday, February 06, 2012 4:40 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] 90.1 Baseline Envelope Interpretation<o:p></o:p></span></p>
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<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>
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<p class="MsoNormal"><b><span style="font-size:6.0pt;font-family:"Optima LT";color:#1A2A6C"><o:p> </o:p></span></b></p>
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<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>
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