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<p class=MsoNormal>I’ve run into one of those grey areas of the Appendix
G language on a project. We are looking at a major renovation project where the
shell of the building will be upgraded. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Clearly the baseline building will be modeled with
insulation U-values that correspond to the existing conditions of the building
rather than the insulation levels prescribed by tables 5.5-1 to 5.5-8. I think
this is pretty well established.<o:p></o:p></p>
<p class=MsoNormal><br>
My question is about the quantity of glazing in each case. For this project we
will be punching new glazing into the existing façade as part of the
renovations. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Table G3.1, Section 5 states that “Vertical
fenestration areas for new buildings <i>and alterations</i> shall equal that in
the proposed design or 40% of gross above-grade wall area, whichever is
smaller.” So if we add new windows, it would seem that the baseline
building should also have those windows, but what should their U-value be? Same
U-value as the other existing windows? Lookup the value for new glazing?<br>
<br>
<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Lower in that same section of Table G3.1 it
states: “Existing Buildings. For existing building envelopes, the
baseline building design shall reflect existing conditions prior to any
revisions that are part of the scope of work being evaluated.” To me,
this seems to say that you would go with the existing quantity of glazing, and
the proposed model would have more glazing than the baseline, even if the
proposed does not exceed the 40% cap.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>There seems to be a little contradiction between the two
requirements. My inclination is that the existing building clause overrides the
requirement that the same amount of glazing be used in each model. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Have any of you worked on a project where this came up? Any
thoughts? It seems like this could potentially be one of those hot topics of
discussion. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Franklin Gothic Demi","sans-serif"'>Nathan
Miller</span><span style='font-family:"Franklin Gothic Demi","sans-serif"'>,
PE, LEED</span><span style='font-size:8.0pt;font-family:"Franklin Gothic Demi","sans-serif";
position:relative;top:-2.0pt;mso-text-raise:2.0pt'>®</span><span
style='font-family:"Franklin Gothic Demi","sans-serif"'> AP<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Senior
Energy Engineer/Mechanical Engineer<o:p></o:p></span></i></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>direct:
206.788.4577<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>fax:
206.285.7111 <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:3.0pt'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'><a href="http://www.rushingco.com/"><span
style='color:blue'>www.rushingco.com</span></a><o:p></o:p></span></p>
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