<p>I am not an expert in eQuest modelling, but are getting into it recently. As for Green Roofs, one must be able to consider various factors to determine effectively the overall energy savings provided by it. The most common way is assigning a R-Value.</p>
<p>Factors to consider:</p>
<ol>
<li>Not all soils are the same. Depending on their composition (refer to FLL standards), each soil will have a different R-Value per inch depth.</li>
<li>Soil depth.</li>
<li>Does the Green Roof system have an air/vapor layer within it?</li>
<li>Location of the Green Roof. Its not the same a Green Roof in Chicago versus one in San Juan, Puerto Rico. Rainfall and ET rates affect the soils moisture content, which in turn affect the R-Value. A wetter soil is much "better" at reducing temperatures than a dry soil.</li>
<li>Does the green roof have an irrigation system?</li>
<li>Enough of the soil: now lets move on to the vegetation.</li>
<li>Must consider type of vegetation. Itīs not the same to have an extensive grass cover versus having an intensive shrubs/trees cover.</li></ol>
<div>I believe there is model out there sponsored by the USGBC specifically for Green Roofs, but I cannot confirm that right now. Will try to find more info on that.</div>
<div> </div>
<div>Sincerely,</div>
<div> </div>
<div>Ing. Francisco Rodriguez-Ema, PE, MSCE</div>
<div>PR Green Design</div>
<div>San Juan, Puerto Rico</div>
<div>c. 787-455-1388</div>
<div> </div>
<div></div>
<div></div>
<div class="gmail_quote">On Tue, Oct 28, 2008 at 10:03 AM, Kevin Felt <span dir="ltr"><<a href="mailto:KevinFelt@magrann.com">KevinFelt@magrann.com</a>></span> wrote:<br>
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<p>Have any of you modeled a Green Roof?</p>
<p>If I put soil as my outermost layer, will eQuest think it is in earth contact?</p>
<p>Thanks</p>
<p> </p>
<p><span style="FONT-SIZE: 10pt; COLOR: blue">Kevin A. Felt</span></p>
<p><span style="FONT-SIZE: 16pt; COLOR: blue">Kevin A. Felt</span></p>
<p><span style="FONT-SIZE: 10pt; COLOR: blue">Senior Technical Analyst</span></p>
<p><span style="FONT-SIZE: 10pt; COLOR: blue">QA Designee</span></p>
<p><span style="FONT-SIZE: 10pt; COLOR: blue">MaGrann Associates</span></p>
<p><span style="FONT-SIZE: 10pt; COLOR: blue">856-722-9799</span></p>
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