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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I would echo this. <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'>In urban settings I would say the priority for using a green roof is for storm water retention (seattle has offered major incentives for this). It has the goal of reducing the need for enlarging existing systems. Storm water systems are designed for the first surge (5 minute flow). If that can be held even briefly it can downsize a system. Gravel alone could accomplish this and most designs are based on the substrate (can’t rely on gardening).<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'>For heat islands both gravel and light coloured membrane can also help this without vegetation but they won’t sequester co2. Even the most minimal green roof (extensive type with sedum) can sequester the equivalent of about 2 vehicles c02 emissions per kilometer per square meter of sedum plantings (msu). Not much mileage if your going to base your vehicle usage on your green roof – but like everything it adds up.<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'>Protecting roofing was a big design incentive for me as roofs are basically bad design and environmental hogs because they have to endure the elements directly. Soil (with or without plants) is an ideal protection. The end result though is minimal cost and material wise as with a green roof due the amount of material needed to reliably provide both long term water and root protection and the potential work involved in restoration for leakage.<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'>So I would venture that the primary motivation for a green roof is simply to maintain as much surface area of the earth as possible as vegetative matter (though many would argue that the urban population already supplies that in excess).<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 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Greenbuilding [mailto:greenbuilding-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>David Wentling<br><b>Sent:</b> January-25-13 8:14 AM<br><b>To:</b> Beatrice Dohrn; Green Building<br><b>Subject:</b> Re: [Greenbuilding] Green Roof under deck<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>Green roof are for storm water control, reducing heat islands, aesthetics, and protect roofing materials from UV exposure. Side benefit is reducing the temperature gradient across the roof which effects indoor comfort. Lets be clear, we do not construct green roofs for keeping buildings cooler. There are more cost efficient ways to do that.<o:p></o:p></span></p><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Arial","sans-serif";color:black'>David Wentling<br>ConservFirst.com<o:p></o:p></span></p></div><div><div><div><div class=MsoNormal align=center style='text-align:center;background:white'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><hr size=1 width="100%" align=center></span></div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> Beatrice Dohrn <<a href="mailto:beatricedohrn@yahoo.com">beatricedohrn@yahoo.com</a>></span><span style='color:black'><o:p></o:p></span></p></div><div id=yiv453468586><div><div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'>Isn't the main point of a green roof to keep the house underneath cool? So if the deck were of an opaque material with that 2' airspace wouldn't the deck the roof cool -- obviating the need for the vegetation? <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></div><p class=MsoNormal style='background:white'><b><span style='font-family:"Arial","sans-serif";color:black'>From:</span></b><span style='font-family:"Arial","sans-serif";color:black'> Gennaro Brooks-Church - Eco Brooklyn <<a href="mailto:info@ecobrooklyn.com">info@ecobrooklyn.com</a>><o:p></o:p></span></p><div><div><p class=MsoNormal style='background:white'><span style='color:black'><br>I just salveged some tempered glass. I have a client who wants me to<br>build a 3" green roof on his brownstone plus a deck that sits 2' above<br>the roof.<br>I suggested a glass deck and green roof under it.<br>He is concerned the vegetation under the glass deck will not survive<br>since it will bake in the summer.<br>Are there any experienced landscapers on this list who can offer their<br>experience? <o:p></o:p></span></p></div></div></div></div></div></div></div></div></div></body></html>