<html><body bgcolor="#FFFFFF"><div>This is an important point to clarify. While the baseline WWR is a percentage of total wall area, the amount of glass on each exposure is to be proportional to the amount with which each exposure in the proposed case is glazed.</div><div> <br><br><div>----------------------------</div><div>Arpan Bakshi</div><div>YRG sustainability</div><div>Direct 646.704.2880</div><div><br></div><div>Sent from my iPhone </div></div><div><br>On Feb 8, 2011, at 7:29 PM, James Newman <<a href="mailto:James.Newman@me-engineers.com">James.Newman@me-engineers.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><div class="WordSection1"><p class="MsoNormal"><span style="color:#1F497D">Correct, so if your proving prescriptive compliance you can use below grade walls, while if your proving compliance through performance modeling then you can only usie above grade walls per ASHRAE 90.1 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">The question that I still have is should the whole building be averaged for fenestration percentage or should each face have its own percentage?<o:p></o:p></span></p><p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p><div><p class="MsoNormal"><b><span style="color:#87C139">James M. Newman, EIT, LEED AP<o:p></o:p></span></b></p><p class="MsoNormal"><span style="font-size:10.0pt;color:#48494A">project engineer / energy analyst<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.0pt;color:#87C139"><o:p> </o:p></span></p></div><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""> Dana Troy [mailto:DTroy@glumac.com] <br><b>Sent:</b> Tuesday, February 08, 2011 5:09 PM<br><b>To:</b> James Newman<br><b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org"><a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a></a><br><b>Subject:</b> RE: [Equest-users] Fenestration and Window to Wall Ratio<o:p></o:p></span></p></div></div><p class="MsoNormal"><o:p> </o:p></p><p class="MsoPlainText">90.1 <u>Appendix G</u> states: "Vertical fenestration areas for new buildings and additions shall equal that in the proposed design or 40% of gross above-grade wall area, whichever is smaller."<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">If you are using 90.1 as your State's code, then you can include the below-grade wall area. If you are <u>modeling</u> using Appendix G, then you cannot include the below grade wall area in your calculations.<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">-Dana<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">Dana Troy<o:p></o:p></p><p class="MsoPlainText">Senior Energy Analyst<o:p></o:p></p><p class="MsoPlainText">GLUMAC | 503.227.5280<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">-----Original Message-----<br>From: James Newman [mailto:James.Newman@me-engineers.com] <br>Sent: Tuesday, February 08, 2011 3:29 PM<br>To: Sunayana Jain<br>Cc: <a href="mailto:equest-users@lists.onebuilding.org"><a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a></a><br>Subject: Re: [Equest-users] Fenestration and Window to Wall Ratio<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">This paragraph comes directly out of the ASHRAE 90.1-2007 User Manual:<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">"Window-Wall Ratio: The window-wall ratio is the ratio of vertical fenestration area to gross exterior wall area. The fenestration area is the rough opening, i.e., it includes the frame, sash, and other nonglazed window components. The gross exterior wall is measured horizontally from the exterior surface; it is measured vertically from the top of the floor to the bottom of the roof. The gross exterior wall area includes below-grade as well as above-grade walls. It is necessary to calculate the window-wall ratio with all compliance options, since this information is need with the prescriptive option, the trade-off option, and the energy cost budget method."<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">James M. Newman, EIT, LEED AP<o:p></o:p></p><p class="MsoPlainText">project engineer / energy analyst<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">-----Original Message-----<o:p></o:p></p><p class="MsoPlainText">From: Sunayana Jain [mailto:sunayana_jain@neo.tamu.edu] <o:p></o:p></p><p class="MsoPlainText">Sent: Tuesday, February 08, 2011 4:20 PM<o:p></o:p></p><p class="MsoPlainText">To: James Newman<o:p></o:p></p><p class="MsoPlainText">Cc: <a href="mailto:equest-users@lists.onebuilding.org"><a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a></a><o:p></o:p></p><p class="MsoPlainText">Subject: Re: [Equest-users] Fenestration and Window to Wall Ratio<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">Hi James,<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">As per my understanding, window wall ratio is considered for above grade walls only for each orientation of building (not floor to floor).<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">Thanks,<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">Sunayana Jain<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">LEED AP, EIT<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">Energy Engineering Specialist<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">----- Original Message -----<o:p></o:p></p><p class="MsoPlainText">From: "James Newman" <<a href="mailto:James.Newman@me-engineers.com">James.Newman@me-engineers.com</a>><o:p></o:p></p><p class="MsoPlainText">To: <a href="mailto:equest-users@lists.onebuilding.org"><a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a></a><o:p></o:p></p><p class="MsoPlainText">Sent: Tuesday, February 8, 2011 5:29:50 PM GMT -05:00 US/Canada Eastern<o:p></o:p></p><p class="MsoPlainText">Subject: [Equest-users] Fenestration and Window to Wall Ratio<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">When calculating the window to wall ratio for your baseline building, should you calculate this percentage as <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"> <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">· an entire building? <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">· each building elevation? <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">· every floor elevation? <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"> <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">Has anyone had an interpretation on this issue? I was reading through the 90.1 User manual and discovered that both above grade walls and below grade walls should be considered for the wall to wall ratio which leads me to believe the calculation should be done as a whole building percentage. Just curious if someone knows the correct answer. <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"> <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">Thanks, <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"> <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">James M. Newman, EIT, LEED AP <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">project engineer / energy analyst <o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"> <o:p></o:p></p><p class="MsoPlainText">_______________________________________________<o:p></o:p></p><p class="MsoPlainText">Equest-users mailing list<o:p></o:p></p><p class="MsoPlainText"><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><o:p></o:p></p><p class="MsoPlainText">To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG"><a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a></a><o:p></o:p></p><p class="MsoPlainText">_______________________________________________<o:p></o:p></p><p class="MsoPlainText">Equest-users mailing list<o:p></o:p></p><p class="MsoPlainText"><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><o:p></o:p></p><p class="MsoPlainText">To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG"><a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a></a><o:p></o:p></p></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Equest-users mailing list</span><br><span><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a></span><br><span>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG"><a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a></a></span><br></div></blockquote></body></html>