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<p class=MsoNormal><span style='color:#1F497D'>I’d agree – I’ve always taken
the 40% WWR mark in context to mean the gross above-grade building surfaces
(minus the roof/skylights of course). Pretty simple.<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 90.1 intended to assign a prescriptive
maximum WWR per face, it would say so. Further, rather than a single value I
would expect to see a chart showing different maximum ratios for each orientation,
and also broken out either by “solar zone” (using a solar map), or perhaps more
simply by latitude. <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'><br>
PS: I realize Joe’s example is just that, an example, but if you’re ever
modeling a 100% glass orientation, it’s worth nothing that any spandrel glass
constructions that don’t transmit light aren’t “vertical fenestrations” as
defined in the definitions, and so wouldn’t count towards the WWR ratio check/calcs.<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:image002.jpg@01CBC83A.77BBDD10"
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<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
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<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</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'>PROJECT ENGINEER<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>Smith &
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color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west
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<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
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<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
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<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
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<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>Fleming,
Joe<br>
<b>Sent:</b> Tuesday, February 08, 2011 6:41 PM<br>
<b>To:</b> James Newman; Dana Troy<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<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=MsoNormal><span style='color:#1F497D'>The whole building is the way I
have always read it. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>So you can have an all glass
North wall (100%) and then 10% glass for E,W,&S and have a total
window-wall ratio of 32.5%. But if you have a North wall with 100%
glass and an E,W,&S wall with 40% glass, you now have to prorate each
exposure down. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>--> (1+0.4+0.4+0.4) / 4 =
55% which is greater than 40%. So, multiply each exposure by
0.4/0.55, and your new window-wall ratios would be N=72.7%, E,W,&S = 29.1%.<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'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span style='color:#1F497D'>Joe Fleming<o:p></o:p></span></b></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#333333'>E.I., LEED
AP BD+C, BEMP<o:p></o:p></span></i></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#333333'>Mechanical
Engineer II<o:p></o:p></span></i></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='color:#006363'>TLC Engineering for
Architecture<br>
</span></b><b><span style='font-size:10.0pt;color:#006363'>Your 2030 Challenge
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<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>800 Fairway
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<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>Deerfield
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<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
</div>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0>
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<td valign=bottom style='padding:0in 0in 0in 0in'>
<p class=MsoNormal align=right style='text-align:right'><span
style='font-size:9.0pt;color:#333333'>phone: </span><span
style='font-size:9.0pt;color:#555555'><o:p></o:p></span></p>
</td>
<td valign=bottom style='padding:0in 0in 0in 0in'>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>954-418-9096<o:p></o:p></span></p>
</td>
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</td>
<td valign=bottom style='padding:0in 0in 0in 0in'>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>954-418-9296<o:p></o:p></span></p>
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<p class=MsoNormal align=right style='text-align:right'><span
style='font-size:9.0pt;color:#333333'>direct: </span><span
style='font-size:9.0pt;color:#555555'><o:p></o:p></span></p>
</td>
<td valign=bottom style='padding:0in 0in 0in 0in'>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>954-418-4591<o:p></o:p></span></p>
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<td valign=bottom style='padding:0in 0in 0in 0in'>
<p class=MsoNormal align=right style='text-align:right'><span
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</td>
<td valign=bottom style='padding:0in 0in 0in 0in'>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><a
href="http://www.tlc-engineers.com/">www.tlc-engineers.com</a><o:p></o:p></span></p>
</td>
</tr>
</table>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><a href="http://www.tlc-engineers.com/"><span
style='text-decoration:none'><img border=0 width=700 height=49 id="_x0000_i1025"
src="cid:image003.gif@01CBC83A.77BBDD10"
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style='color:#1F497D'><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>James
Newman<br>
<b>Sent:</b> Tuesday, February 08, 2011 7:29 PM<br>
<b>To:</b> Dana Troy<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<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=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> equest-users@lists.onebuilding.org<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: equest-users@lists.onebuilding.org<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: equest-users@lists.onebuilding.org<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"
<James.Newman@me-engineers.com><o:p></o:p></p>
<p class=MsoPlainText>To: equest-users@lists.onebuilding.org<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>
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