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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Actually, existing building envelopes are generally pretty poor
performers. Upgrading insulation levels usually makes up for any
small penalties associated with adding a few windows, especially if high
performance glazing is used in any windows that are replaced. I’ve
found it’s much easier to get EA Credit 1 point in existing buildings
than in new construction. One other simple way to get benefit in existing
buildings is by reducing infiltration rates by tightening up the
envelope. We generally try to do before and after blower door tests in
existing buildings and do an ECM to take credit for decreased infiltration.
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Morgan Heater, P.E.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>BEMP, LEED AP<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>morgan@ecotope.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>206-322-3753 ext 209<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Nick Caton<br>
<b>Sent:</b> Tuesday, October 11, 2011 3:18 PM<br>
<b>To:</b> James Hansen; Paul Riemer; Anne Juran;
bldg-sim@lists.onebuilding.org<br>
<b>Cc:</b> Gail Hampsmire<br>
<b>Subject:</b> Re: [Bldg-sim] LEED and existing envelopes<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>James, your logic and resulting conclusions appear spot on to
me, for what it’s worth =).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>NC buildings do seem to have an easier time being designed as a
fishbowl than existing buildings turning into one (speaking qualitatively
here). I could only speculate as to whether that’s by design or
accident on USGBC’s part. My guess is it’s an unintentional
result of NC baselines being necessarily more arbitrary-to-reality.
Perhaps this “difficulty-gap” between NC and EB modeling is
something the EA tag committee could or has already addressed? <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I think you can take your conclusions a step further and say
that the present LEED system holistically, through the energy modeling credits
and their relative importance in v3 onwards, is very much discouraging
allocating your project budget towards converting existing buildings envelopes
to glass walls, and conversely encouraging spending your dollars elsewhere to
net a “more green” energy result… In the “spec
office scenario” below with daylighting credits out of the picture, it
would appear LEED is giving a clear NO signal to any window/shading upgrade
that doesn’t provide a net energy benefit on its own. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Speaking outside of the confines of LEED, I won’t say this
is necessarily reasonable… I personally would work more productively in a
relatively inefficient office with a great view than a more efficient cave
– which would result in more quality building systems getting designed
for the world to enjoy ;). LEED by its nature has an inescapable
“social policy” side where value judgements are being made in spite
of what building design professionals and owners know/ think.
Constructively, perhaps the rules could be improved from “never
install glazing” to encourage “install glazing and do a quality job
of minimizing the negative energy impact.” That’s what
we’d do without such constraints. Then again, perhaps the powers-that-be
cannot accept that daylighting/views have an impact that is not measureable in
a utility bill… or perhaps those powers need to spend some extended time
in a cubicle farm? :-) <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Again, haven’t done a LEED-EB model myself, so I’m
only speaking from my “outside the LEED box” renovation modeling experience.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I also emphatically agree daylighting controls are not a panacea
to energies burned/lost with windows (and even if they were, they’re too
expensive to be treated that way responsibly), but should be budgeted and
considered as part of a cohesive & deliberate window/shading/space layout
strategy. The concept of “ideal WWR” becomes a very dynamic,
complex and climate/project-specific problem when daylighting controls are
involved… All the more reason to engage (and compensate) your
energy modelers early in design, though I know I’m preaching to the
choir!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>~Nick<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=119 height=37 id="_x0000_i1029"
src="cid:image001.jpg@01CC8901.2F505C30" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;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'>NICK CATON, P.E.<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'>SENIOR ENGINEER<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Smith & Boucher Engineers</span><span style='font-size:7.5pt;
color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>25501 west valley parkway, suite 200<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>olathe, ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>direct 913.344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>fax 913.345.0617<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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;font-family:"Calibri","sans-serif";color:blue'> </span></u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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"'> James Hansen
[mailto:JHANSEN@ghtltd.com] <br>
<b>Sent:</b> Tuesday, October 11, 2011 2:10 PM<br>
<b>To:</b> Nick Caton; Paul Riemer; Anne Juran; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Bldg-sim] LEED and existing envelopes<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Well wait a second - if I have a building with no windows, and I
go to one with say 40% glass, there is going to be a huge increase in energy
consumption, and we can't assume it will be offset by daylight harvesting as
that is an expensive thing for a spec office building developer (as an example)
to provide. And this particular building is not getting any of the daylight
and views credits because of shape. (so Paul, it is truly a net penalty to add
windows, especially since we're talking about at least 2 or 3 EAc1 pts).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There is only a 4% savings delta in the point thresholds for new
buildings vs existing buildings (3 pts under CS is 8% for existing buildings
and 12% for new buildings).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I can almost guarantee that if I am comparing a baseline <b><u>existing</u></b>
building with </span><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:red'>no</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> glass to a proposed building with 40% glass, it will show
substantially worse savings than if I was comparing a baseline <b><u>new</u></b>
building with </span><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:red'>40%</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> glass to a proposed building with 40% glass. And by
substantially, I mean more than 4% worse.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>With that in mind, I would actually BENEFIT from treating the
baseline building as a new building. That doesn't seem right ?? <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>But I appreciate everyone's input. I guess I've just
"snuck" 3 or 4 existing building projects thru the system.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-James<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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"'> Nick Caton
[mailto:ncaton@smithboucher.com] <br>
<b>Sent:</b> Tuesday, October 11, 2011 2:54 PM<br>
<b>To:</b> Paul Riemer; James Hansen; Anne Juran;
bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Bldg-sim] LEED and existing envelopes<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I’ve
never done a core & shell model, so take this opinion with a grain of
salt (it’s only my opinion):</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>This
reviewer’s interpretation seems to make a lot of sense to me. Have
the baseline represent the actual existing building, and have the proposed
match the actual design. To my understanding, the only reason we make
them match 1:1 for new construction is there isn’t a better means (like
when you have an existing building) to define a baseline that would treat
evenhandedly all building types/climates/circumstances, so we have them match
to at least ensure level playing field.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Put
another way, and in response to James’ query, I think if adding windows
(nice or not) cause the energy bills to go up in an existing building, then
that should be reflected in the energy model. Simultaneously,
if you are interested to add daylighting “in moderation,” and locate/orient
glazing & shading devices in a fashion that lowers the annual bills, then
that should also be reflected in the energy model. </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>It’s
important to remember not all exterior glazing is bad from an energy
perspective, particularly when daylighting controls for the building interior
lighting are added into the mix. WWR is one area where “engineers
and architects” (or “energy and aesthetics,” if that better
describes your design team) do not need to be on opposite ends of the table!</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>~Nick</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img border=0 width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CC8901.2F505C30" alt="cid:489575314@22072009-0ABB"></span><o:p></o:p></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'> </span></b><o:p></o:p></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, P.E.</span></b><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'>SENIOR ENGINEER</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Smith & Boucher Engineers</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>25501 west valley parkway, suite 200</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>olathe, ks 66061</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>direct 913.344.0036</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>fax 913.345.0617</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>www.smithboucher.com</span><u><span style='font-size:10.0pt;
font-family:"Calibri","sans-serif";color:blue'> </span></u><o:p></o:p></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Paul Riemer<br>
<b>Sent:</b> Tuesday, October 11, 2011 1:46 PM<br>
<b>To:</b> 'James Hansen'; Anne Juran; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] LEED and existing envelopes</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I also agree with the reviewer. The existing envelope
condition stipulation is a double edged sword. Do you truly think
it is a net penalty on your LEED application to add windows? Other LEED
points reward daylight and views, and the thermal energy impacts of the windows
are hopefully offset by electric lighting savings. </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal style='text-autospace:none'><b><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:#5F574F'>Paul Riemer, PE, LEED AP BD+C</span></b><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><b><span style='font-family:"Verdana","sans-serif";
color:#C00000'>DUNHAM</span></b><o:p></o:p></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>James
Hansen<br>
<b>Sent:</b> Tuesday, October 11, 2011 1:31 PM<br>
<b>To:</b> Anne Juran; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] LEED and existing envelopes</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks
for the responses Anne and Bill. But this seems ridiculous, and goes
against everything I've done to date.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>So
if we have an existing building with no windows, and we want to reuse the
building structure/skin (which LEED strongly encourages), we get penalized for
wanting some daylight in the building? <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I
think all of the references to the "baseline building envelope shall
represent existing conditions" is intended to demonstrate that you can use
existing window and wall coefficients, NOT that you can't add windows.
But what do I know...<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Does
anyone know for sure?<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>GHT
Limited<br>
James Hansen, P.E., LEED AP</b><br>
Senior Associate<br>
1010 N. Glebe Road, Suite 200<br>
Arlington, VA 22201-4749<br>
703-243-1200 (office)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>703-338-5754
(cell)<br>
703-276-1376 (fax)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><a
href="http://www.ghtltd.com/">www.ghtltd.com</a><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>From:</b>
Anne Juran [mailto:juran@summerconsultants.com] <br>
<b>Sent:</b> Tuesday, October 11, 2011 2:02 PM<br>
<b>To:</b> James Hansen; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Bldg-sim] LEED and existing envelopes<o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I
find existing envelopes always tricky because the information is not delivered
in the clearest manner. However, I think in this case the reviewer is
correct, based on 90.1 Table G3.1.5 item f under “Baseline Building
Performance” and page G-17 of the User’s Manual. Also, in
item c they explicitly state that it applies to new buildings and additions,
but do not list existing (other than the little blip about alterations and
5.1.3.)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>From:</b>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>James
Hansen<br>
<b>Sent:</b> Tuesday, October 11, 2011 10:23 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] LEED and existing envelopes<o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I
know this has been covered before, but I just received the following comment
from a GBCI reviewer for a v3 Core and Shell project I'm working on. The
project is basically an existing 5-story warehouse with almost no
windows. Part of the renovation is adding windows. The comment is
as follows:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Table
1.4.1B indicates that the window-to-gross-wall ratio is identical in both
cases; however it is unclear whether any fenestration was added or removed as
part of the renovation. The baseline ratio must reflect the ratio as it existed
prior to the renovation and the proposed ratio must reflect the ratio as it
exists after the renovation. Revise the Baseline and/or Proposed cases as
necessary so that the window-to-gross-wall ratio is accurately modeled and
provide a revised prerequisite form and updated energy model output summaries
as necessary. <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I
didn't think that this was the case - I thought that if you had an existing
building, any EXISTING-TO-REMAIN windows would show up as the existing window
type, but any NEW windows in the proposed alteration would be matched in the
baseline model and comply with the Table 5.5 requirements. Meaning the
WWR remained the 1:1 as long as it was < 40% glass.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I
think this is just a matter of educating the reviewer on our building, but I
wanted to make sure that there hadn't been a shift in how GBCI reviews existing
buildings.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks!<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>GHT
Limited<br>
James Hansen, P.E., LEED AP</b><br>
Senior Associate<br>
1010 N. Glebe Road, Suite 200<br>
Arlington, VA 22201-4749<br>
703-243-1200 (office)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>703-338-5754
(cell)<br>
703-276-1376 (fax)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><a
href="http://www.ghtltd.com/">www.ghtltd.com</a><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>The
information contained in this communication is confidential, may be privileged,
and is intended only for the use of the addressee. It is the property of
GHT Limited. Unauthorized use, disclosure or copying of this
communication or any part thereof is strictly prohibited and may be
unlawful. If you have received this communication in error, please notify
me immediately by return e-mail or by e-mail to <a href="mailto:ght@ghtltd.com">ght@ghtltd.com</a>,
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may be privileged, and is intended only for the use of the addressee. It
is the property of GHT Limited. Unauthorized use, disclosure or copying
of this communication or any part thereof is strictly prohibited and may be
unlawful. If you have received this communication in error, please notify
me immediately by return e-mail or by e-mail to </span><span style='font-size:
10.0pt;color:black'><a href="mailto:ght@ghtltd.com"><span style='font-family:
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10.0pt;font-family:"Arial","sans-serif";color:black'>, and destroy this
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style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:blue'>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>The information contained in this communication is confidential,
may be privileged, and is intended only for the use of the addressee. It
is the property of GHT Limited. Unauthorized use, disclosure or copying
of this communication or any part thereof is strictly prohibited and may be
unlawful. If you have received this communication in error, please notify
me immediately by return e-mail or by e-mail to </span><span style='font-size:
10.0pt;color:black'><a href="mailto:ght@ghtltd.com"><span style='font-family:
"Arial","sans-serif"'>ght@ghtltd.com</span></a></span><span style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:black'>, and destroy this
communication and all copies thereof, including all attachments. Thank
you.</span><span style='font-size:10.0pt;color:blue'><o:p></o:p></span></p>
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