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<p class="MsoNormal"><span style="color:#1F497D">Hi Tim,<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">Your LEED reviewer is spot on: refer to Appendix A7/7.1 in 90.1. The “fallback” ASHRAE values provided for various constructions/elements (incl. doors) are there as a means of last resort. If you can determine
the correct value, you should use it.<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">One can only speculate at what inputs you used (or didn’t use) to arrive at a given U-value for your doors… sounds like you didn’t reference the actual product/specification and should adjust to match as appropriate.<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">The online tool you found is in a sense already built into eQuest, and as such is probably a more time-efficient way to determine, define, & document construction thermal properties (i.e. in one step). Choose
to define your constructions in layers, and you’ll find there’s a library of materials similar to that online tool.<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 can be multiple right answers, but your attic sounds like an unconditioned space of its own, which in turn should be defined with exterior surfaces (walls/roofs), and the spaces immediately below should
have interior surfaces to match the insulated ceiling construction.<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">If you find yourself mostly “stuck” on the specifics/fundamentals of defining the constructions thermally, you might more time-efficiently engage your favorite MEP designer/consultant ;).<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">Best of luck!<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>
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<p class="MsoNormal"><span style="color:#1F497D"><img width="119" height="37" id="Picture_x0020_1" src="cid:image001.jpg@01CD86A2.4F08E7A0" 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>tim<br>
<b>Sent:</b> Thursday, August 30, 2012 10:41 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] u-values<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I let my eQuest model generate U-values (see LV-I report – page 2 of attached pdf)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The U-values don’t seem to make any sense. The LV-I report says a door has a U-value of 2.080.<o:p></o:p></p>
<p class="MsoNormal">I looked up hollow metal insulated doors on the internet and found one that has a value of 0.16.<o:p></o:p></p>
<p class="MsoNormal">Why is there such a difference?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I know how to change u-values in detailed edit mode, but wonder what experience others have had with determining what U-values should be used.<o:p></o:p></p>
<p class="MsoNormal">I used an online calculator to find the u-value for a wall like mine (also attached).<o:p></o:p></p>
<p class="MsoNormal">Having trouble figuring out how to determine/ enter u-value for a roof assembly that is a trussed attic with insulation above ceiling as well as others.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I also realize ASHRAE has basic u-values listed, but my leed reviewer commented saying ASHRAE U-values should be used only if the actual U-values are unknown. I assume this means if the makeup of a wall or assembly cannot be determined.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for your help in advance!<o:p></o:p></p>
<p class="MsoNormal">Timothy W. Hill<o:p></o:p></p>
<p class="MsoNormal"><a href="mailto:tim.JRGA@fuse.net">tim.JRGA@fuse.net</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">John R. Grier, Architect<o:p></o:p></p>
<p class="MsoNormal">11309 Deerfield Road<o:p></o:p></p>
<p class="MsoNormal">Cincinnati, Ohio 45242<o:p></o:p></p>
<p class="MsoNormal">(513)489-3690<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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