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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Penn
State University (<a href="http://horticulture.psu.edu/cms/greenroofcenter/">http://horticulture.psu.edu/cms/greenroofcenter/</a>)
and Michigan State University (<a href="http://www.hrt.msu.edu/greenroof/">http://www.hrt.msu.edu/greenroof/</a>)
both have significant research programs on green roofs.&nbsp; I would recommend
looking at the results of the Penn State study on energy transfer in Green
Roofs (<a
href="http://etda.libraries.psu.edu/theses/approved/WorldWideFiles/ETD-4616/Thesis_Paulo_Tabares_revised.pdf">http://etda.libraries.psu.edu/theses/approved/WorldWideFiles/ETD-4616/Thesis_Paulo_Tabares_revised.pdf</a>).&nbsp;
In general, green roofs handle energy through the insulating effects of soil,
the cooling effects of evapotranspiration in the plants, and water flows within
the green roof assembly.&nbsp; This means that a calculated R-value will be
different depending on the amount of plant material participating in
evapotranspiration, the wetness of the soil, and whether the roof is intensive
or extensive.&nbsp; A straight R-value approach is very simplified and should
be used with the understanding that model results are much less likely to be
accurate.&nbsp; The Penn State study gives a review of published literature
showing extensive green roofs have R-values between 1.8 and 4.8 while intensive
green roofs have R-values between 5 and 20.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>In
general, the average R-value of soil is 0.25 per inch, so for a 12&#8221; soil
depth the R-value of the soil would be R-3 excluding assumptions on soil
wetness and evapotranspiration.&nbsp; We typically go conservative and just
model the R-value of the additional soil since you would need a TRNSYS or
MatLab model to take into account the other energy benefits of a green roof.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#C75B12'>JEREMY R. POLING, PE, LEED AP</span></b><span style='font-size:
10.0pt;font-family:"Arial","sans-serif"'><br>
</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:gray'>Associate Vice President,<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:gray'>Senior Sustainability Analyst<br>
Strategic Services<br>
<i>Site Solutions&nbsp;| Operations&nbsp;| Sustainability</i></span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
</span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#C75B12'>EPSTEIN</span></b><span style='font-size:10.0pt;font-family:
"Arial","sans-serif"'><br>
</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif"'><br>
</span><b><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:green'>Epstein is a firm believer in sustainability. We ask that you
please consider the environment before printing this e-mail.</span></i></b><span
style='font-size:8.0pt;font-family:"Arial","sans-serif";color:gray'><o:p></o:p></span></p>

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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>

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<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>Fareed Syed<br>
<b>Sent:</b> Friday, June 25, 2010 8:05 AM<br>
<b>To:</b> Jason Boehning; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Modeling a Green Roof<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Segoe UI","sans-serif";
color:#1F497D'>I heard from our director of sustainability to use R-5 for a
typical green roof. It was confirmed by few senior architects.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Segoe UI","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Segoe UI","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Segoe UI","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Segoe UI","sans-serif";
color:#1F497D'>Fareed<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Segoe UI","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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<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>Jason
Boehning<br>
<b>Sent:</b> Friday, June 25, 2010 8:46 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Modeling a Green Roof<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Howdy!
<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Has
anyone modeled a green roof? I have a standard roof with 12 inches of soil and
grass. I have been searching the web for thermal properties such as U values,
thermal absorptivity and so on. Are there any good references to find these
values or does anyone have tips to model a green roof? I appreciate your help.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoAutoSig>Jason Boehning, EIT<o:p></o:p></p>

<p class=MsoAutoSig>Mechanical Engineer<o:p></o:p></p>

<p class=MsoAutoSig><img border=0 width=207 height=72 id="_x0000_i1025"
src="cid:image001.gif@01CB1442.78B75930"><o:p></o:p></p>

<p class=MsoAutoSig>6161 Savoy, Suite 1212<o:p></o:p></p>

<p class=MsoNormal>Houston, Texas&nbsp; 77036<o:p></o:p></p>

<p class=MsoNormal>&nbsp;<o:p></o:p></p>

<p class=MsoNormal>&nbsp;v.&nbsp; 713.482.2322<o:p></o:p></p>

<p class=MsoNormal>&nbsp;f.&nbsp;&nbsp; 713.482.2314<o:p></o:p></p>

<p class=MsoNormal>&nbsp;e. <a href="mailto:Jason.Boehning@ricegardner.com"><span
style='color:windowtext'>Jason.Boehning@ricegardner.com</span></a><o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

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