Ill give it a try<span></span><br><br>On Saturday, October 12, 2013, John Salmen wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-CA" link="blue" vlink="purple">
<div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I think the roof chips have to be thought of as just roof cover initially not a growing medium. Moss could be established. If the roof is partly intensive this could work well as the chips will compost over time and can be encouraged to do so which then supplements the nutrient needs for the soil mix for the intensive plants. In terms of landscaping maintenance it is similar to on the ground – a woodchip path has to be scraped back occasionally and renewed. The bottom layer is the composted soil material which saves bringing in organic material.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">You can play with depths – 3” will compost quicker and support more life than 6”. I don’t think weight will be an issue as you pretty well have to design for a certain depth of saturated soils no matter what.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u> <u></u></span></p><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:<a href="javascript:_e({}, 'cvml', 'greenbuilding-bounces@lists.bioenergylists.org');" target="_blank">greenbuilding-bounces@lists.bioenergylists.org</a>] <b>On Behalf Of </b>Gennaro Brooks-Church - Eco Brooklyn<br>
<b>Sent:</b> October-12-13 8:18 AM<br><b>To:</b> Green Building<br><b>Subject:</b> Re: [Greenbuilding] Growing Media Embodied Energy<u></u><u></u></span></p></div><p><u></u> <u></u></p><p>That is a good idea. I've actually been meaning to look into Black Locust chips given that woods ability to not rot under ground. My current project is semi intensive so my reservation is what will happen to the weight over time. The wood will decompose and shrink in depth, requiring the addition of more. Each time you do that the weight increases. Is that a valid concern?<u></u><u></u></p>
<div><p><u></u> <u></u></p></div><div><p>As an extensive sedum or moss cover then wood chips is a no brainer. <br><br>On Saturday, October 12, 2013, John Salmen wrote:<u></u><u></u></p><div><div><p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I would seriously look at using ground up wood waste / wood chips. They can hold their structure for years achieving a number of green roof goals without the green initially. The end product is soil so you can look at it as a green roof in process or simply an urban composting area. Wood chips have been used in biofilters and support a diversity of life. </span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><u></u><u></u></p><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p><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:<a>greenbuilding-bounces@lists.bioenergylists.org</a>] <b>On Behalf Of </b>Gennaro Brooks-Church - Eco Brooklyn<br>
<b>Sent:</b> October-12-13 4:40 AM<br><b>To:</b> Green Building<br><b>Subject:</b> Re: [Greenbuilding] Growing Media Embodied Energy</span><u></u><u></u></p></div><p> <u></u><u></u></p><p>That's very helpful. Thanks John. I agree with your list of priorities. I would add quality of life, for all biota, especially in the city. <u></u><u></u></p>
<div><p>I'm really struggling to find a lower embodied energy light aggregate here in NYC. <u></u><u></u></p></div><div><p>It's turning out to be as easy as my other quest- to find a greener option to sheet rock. <br>
<br>On Friday, October 11, 2013, John Salmen wrote:<u></u><u></u></p><div><div><p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">The ESCSI (lightweight aggregate institute put out numbers in 2012). For manufactured materials like expanded shale or other lightweight aggregates the number is same for all - 2.16MBtu/ton or 1.34 mbtu/cubic yard. Carbon dioxide is 350.5 lbs/ton 218lbs/cy.</span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><u></u><u></u></p><p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Sand is about 20,000 Btu per ton and Crushed stone about 30,000 Btu/ton. </span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><u></u><u></u></p><p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Those numbers don’t get it to your building site though.</span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><u></u><u></u></p><p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I’m doing another green roof now (extensive type) and I’ve switched from varied sedum type mix to just a moss roof (they typically turn into a moss roof anyway and its a more desirable material in my mind). Soil mix is simpler and can be limited to local sandy soils or cement sands (different particle sizes) with some aggregate – limited organics. Less saturated weight. </span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><u></u><u></u></p><p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">For me the main points of a green roof are </span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">-</span><span style="font-size:7.0pt"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">To substitute a natural bulk material (soils primarily) for a manufactured sacrificial material (roofing that can withstand the elements</span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">-</span><span style="font-size:7.0pt"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">To reduce concentrated peak water flows (preventing erosion, etc.)</span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">-</span><span style="font-size:7.0pt"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""></span></p>
</div></div></div></div></div></div></div></div></blockquote><br><br>-- <br>Gennaro Brooks-Church, Director<br>Eco Brooklyn<br>347-244-3016<br>22 2nd St, BK NY 11231<br>Sent from Mobile<br>