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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Construction practices for each unique location/building
combination should take into account the items Robert mentions presuming
appropriate design. Wind profiles, building pressure control, stack effect,
building shape and so on should all be accounted for in design and then
appropriate practices should be followed.<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'>Without appropriate inspections during construction, building
leakage testing, and envelope commissioning ‘savings’ may be shown
in energy modeling but never achieved in the real world. My opinion is
that this is a contributor to why energy calculations do not match up to
reality now.<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'>Thanks,<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'>Andy <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:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Andy Hoover</span><span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Principal<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>The BEST Consultant, Inc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Office: 678-200-7648<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Fax:678-827-0574<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Cell: 678-793-1159<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:navy'><a
href="http://www.thebestconsultant.com">www.thebestconsultant.com</a></span><span
style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:gray'>This message may contain confidential and/or privileged
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<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>Robert
Gengelbach<br>
<b>Sent:</b> Wednesday, August 26, 2009 10:26 AM<br>
<b>To:</b> 'Jon Evans'; sheffer@energyopportunities.com; 'Paul Grahovac';
bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Air leakage, LEED, and Appendix G of ASHRAE 90.1<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>I agree with
Jon’s comments about specification of products as being a small portion
of how much infiltration a building will have, not only do construction
practices play a role but also wind profiles on the building, whether the
mechanical systems are controlling building pressure, whether the building is
tall enough to have a stack effect, building shape etc… Even in
performing a winter load calculation and a summer load calculation we usually
change the infiltration rates slightly because average winter wind speeds are
greater than summer wind speeds.<span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>If infiltration is
going to be accounted for as a savings in energy modeling, I would think that
building leakage testing (similar to duct leakage testing) and envelope
commissioning would need to become more prominent in our business. ASHRAE
has funded some studies on infiltration but the data I have seen has been for
residential construction.<span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><img border=0
width=268 height=80 id="Picture_x0020_1"
src="cid:image001.png@01CA2665.D5862090"
alt="cid:image003.png@01C9AB43.F0BEE290"><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>Robert Gengelbach,
PE, LEED<span style='font-size:8.0pt;position:relative;top:-3.0pt;mso-text-raise:
3.0pt'>®</span><span style='font-size:11.0pt'> </span>AP<b><span
style='font-family:"Cambria","serif";color:#1F497D'><o:p></o:p></span></b></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>Sustainable
Mechanical Design Associates, LLC<b><span style='font-family:"Cambria","serif";
color:#1F497D'><o:p></o:p></span></b></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>89 Monroe Center NW<span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>Suite 302<span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>Grand Rapids, MI
49503<span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>P: (616) 776-9009<span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>F: (616) 776-9010<span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>C: (616) 570-2329<span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><a
href="mailto:rgengelbach@sustainablemech.com"><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif"'>rgengelbach@sustainablemech.com</span></a><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p><span
style='text-decoration:none'> </span></o:p></span></u></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:18.0pt;font-family:Webdings'>P</span><span style='color:navy'>
</span>Please print only if necessary<span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
</div>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><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=section1 style='margin:0in;margin-bottom:.0001pt'><b>From:</b>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Jon Evans<br>
<b>Sent:</b> Tuesday, August 25, 2009 9:09 AM<br>
<b>To:</b> sheffer@energyopportunities.com; 'Paul Grahovac';
bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Air leakage, LEED, and Appendix G of ASHRAE 90.1<span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p>
</div>
</div>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>In my experience
modeling of infiltration has nothing to do with actual infiltration in a
constructed building. How much infiltration results in an actual building
is 99.9% construction and 0.1% design and specification. A well design
building to minimize infiltration, with poor attention to details during
construction and sloppy workmanship can end up having more infiltration than an
average design with a good construction team. <span style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>I have looked in
many plenums only to see daylight and cold-wintery air flowing into the
building, even on LEED projects.<span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>These issues make it
very difficult to justify infiltration savings in an energy model.<span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p>
<div>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><strong><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Jon
Evans, PE, LEED AP</span></strong><strong><span style='color:black'><o:p></o:p></span></strong></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;
font-style:normal'>Project Engineer | jevans@sustaineng.com</span></em><em><span
style='font-style:normal'><o:p></o:p></span></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;
font-style:normal'><o:p> </o:p></span></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><img border=0
width=185 height=69 id="_x0000_i1025" src="cid:image002.jpg@01CA2665.D5862090"><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;
font-style:normal'><o:p></o:p></span></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;
font-style:normal'><o:p> </o:p></span></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;
font-style:normal'>431 Charmany Drive, Suite 102 | Madison, Wisconsin 53719<o:p></o:p></span></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;
font-style:normal'>608.231.9664 ext. 13 | Fax: 608.231.9665<o:p></o:p></span></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";font-style:normal'><a
href="http://www.sustaineng.com/"><span style='color:black'>www.sustaineng.com</span></a></span></em><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy;font-style:
normal'><o:p></o:p></span></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy;font-style:
normal'><o:p> </o:p></span></em></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><em><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>2009 Dane
County Small Business Award Recipient</span></em><span class=MsoHyperlink><i><span
style='color:gray'><o:p></o:p></span></i></span></p>
</div>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p>
<div>
<div class=section1 align=center style='margin:0in;margin-bottom:.0001pt;
text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><b>From:</b> Marcus
Sheffer [mailto:sheffer@energyopportunities.com] <br>
<b>Sent:</b> Monday, August 24, 2009 8:22 AM<br>
<b>To:</b> 'Paul Grahovac'; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Air leakage, LEED, and Appendix G of ASHRAE 90.1<o:p></o:p></p>
</div>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>As I understand it
the issue is that the 90.1 Standard does not establish a base line condition
for air leakage so no savings can be claimed. I certainly agree that the
savings are real and should be counted. I know that the Appendix G
committee has this issue on their extensive “to do” list.<span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>Marcus Sheffer,
Chair – USGBC EA TAG<span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>7group<span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><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=section1 style='margin:0in;margin-bottom:.0001pt'><b>From:</b>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Paul
Grahovac<br>
<b>Sent:</b> Wednesday, August 19, 2009 7:00 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Air leakage, LEED, and Appendix G of ASHRAE 90.1<span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p>
</div>
</div>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>The National
Institute of Standards and Technology (NIST) did an extensive study documenting
a greater than 40% natural gas savings and a greater than 25% electricity
savings across the nation for building energy consumption if buildings were
uniformly constructed with air barrier systems installed. They evaluated
116 existing buildings and computer modeled several different building
types. The purpose of their study was to provide information to ASHRAE
concerning whether it would be desirable to add an air barrier requirement to
ASHRAE 90.1.<span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>As a result,
I’ve always thought that Appendix G to ASHRAE 90.1 allows you to change
the air leakage rate off the default and onto a rate corresponding to an air
barrier installation, so that you could claim LEED points for the corresponding
energy savings. However, an architect at a presentation I did said you
could not do that under the LEED and ASHRAE requirements. (I know the
models will do it, because I’ve done it on the TRANE model and obtained
results that support the NIST findings.)<span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>I see in Appendix G
that: “G3.1.2.5. <b>Ventilation</b>. Minimum <i>outdoor air</i>
ventilation rates shall be the same for the <i>proposed</i> and <i>baseline
building designs</i>.” However, I searched the document for
“outdoor air ventilation” and the phrase occurs only in the context
of mechanical systems that are designed to intentionally bring air into the
building. If this section is the basis for concluding that air leakage
barriers should be left out of the modeling, then I have trouble understanding
why.<span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt;text-autospace:none'>Appendix
G says that all components of the building are to be modeled as designed.
That would preclude modeling as if an air barrier system did not exist in the
design. It says the baseline building model is to have steel-framed
above-grade walls, and it is silent about the design building, but the
User’s Manual says that if the design building walls are block or cast
concrete, then “the mass is credited in the building performance rating
method.” Likewise, if the walls are wood stud instead of steel,
then the Manual says credit is given for the superior energy performance of
wood frame versus steel frame. The User’s Manual states that
it: “Offers information on the intent and application of Standard
90.1.” Given these examples in the Manual based on existing thermal
mass energy-saving data and wood-versus-steel stud energy data, it is difficult
to conclude that a wall that is constructed with materials meeting the air
leakage limits and installation requirements of the Air Barrier Association of
America and determined to produce significant energy savings by the NIST study
based on those same limits and requirements should be modeled as if it leaked
air like a building without an air barrier. <o:p></o:p></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>Please let me know
what you think, and if you know of any reason why it is not proper to change
the air leakage rate through the building envelope in the design model to show
the benefit of air barriers.<span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'>Thanks,<span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt;text-autospace:none'>Paul
Grahovac, LEED AP<span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p></o:p></span></p>
<p class=section1 style='margin:0in;margin-bottom:.0001pt;text-autospace:none'>R-GUARD
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