<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">The problem with the rubber sidewalk installation is it’s still not permeable. Yes, there’s flexibility but there’s no air or moisture being introduced into the substrate and you will get roots growing in the interface between the rubber sidewalk and the compacted substrate, resulting in a reduced bootable soil volume and probably damage to the driveway over the longterm.<div class=""><br class=""></div><div class="">The idea is to do an installation so that you have roots growing where they belong - within the substrate. To eliminate organic matter from the structural soil means that you are compromising the tree on behalf of the driveway when, in fact, you should be aiming for equilibrium so the tree can get what it needs, it’s structural roots can be sustained and the driveway can function.</div><div class=""><br class=""></div><div class="">Naomi Zürcher<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Jul 14, 2020, at 9:22 AM, Charlotte Young via CANUFNET <<a href="mailto:canufnet@list.web.net" class="">canufnet@list.web.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 15px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">And, soft sidewalks have the additional benefit that they’re much easier on people’s feet and knees that all the concrete we walk on! Talk to any physiotherapist and they’ll tell you that all the even, flat surfaces we walk on are really bad for our feet. Uneven surfaces, like we find in nature, are much better as we use more foot muscles and the feet more in more directions. Nature always knows!<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">Charlotte Young<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">~~~~~<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">Get quarterly tip sheets on how to build strong organizations and work collaboratively for greater effect. Sign up here:<span class="Apple-converted-space"> </span><a href="http://envision-synergy.net/subscribe/" style="color: purple; text-decoration: underline;" class=""><span style="color: rgb(5, 99, 193);" class="">http://envision-synergy.net/subscribe/</span></a><o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">~~~~~<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">Charlotte Young, Ph.D., Facilitator~Graphic Recorder~Evaluator<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">envision SYNERGY ~ environmental vision together<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">Catalyzing collaboration for a healthy planet – across sectors, silos and skill sets<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">120 Dewhurst Blvd. Toronto ON M4J 3J6<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class=""><a href="http://envision-synergy.net/" style="color: purple; text-decoration: underline;" class="">envision-synergy.net</a><span class="Apple-converted-space"> </span>~<span class="Apple-converted-space"> </span><a href="http://pictureyourthoughts.com/" style="color: purple; text-decoration: underline;" class="">pictureyourthoughts.com</a><o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">416-778-4713;<span class="Apple-converted-space"> </span><a href="mailto:charlotte@envision-synergy.net" style="color: purple; text-decoration: underline;" class=""><span style="color: rgb(5, 99, 193);" class="">charlotte@envision-synergy.net</span></a><o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">~~~~~<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div class=""><div style="border-style: solid none none; border-top-width: 1pt; border-top-color: rgb(225, 225, 225); padding: 3pt 0cm 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span lang="EN-US" class="">From:</span></b><span lang="EN-US" class=""><span class="Apple-converted-space"> </span>CANUFNET [<a href="mailto:canufnet-bounces@list.web.net" style="color: purple; text-decoration: underline;" class="">mailto:canufnet-bounces@list.web.net</a>]<span class="Apple-converted-space"> </span><b class="">On Behalf Of<span class="Apple-converted-space"> </span></b>Ian Wilson via CANUFNET<br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>July 13, 2020 5:17 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>'Canadian Urban Forest Network' <<a href="mailto:canufnet@list.web.net" style="color: purple; text-decoration: underline;" class="">canufnet@list.web.net</a>><br class=""><b class="">Cc:</b><span class="Apple-converted-space"> </span>Ian Wilson <<a href="mailto:IWilson@kelowna.ca" style="color: purple; text-decoration: underline;" class="">IWilson@kelowna.ca</a>><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [CANUFNET] Constructing Driveways within Critical Root Zones<o:p class=""></o:p></span></div></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class="">Not a driveway example but I have an example of construction of a new sidewalk across a critical root zone.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class="">Approx. 12 years ago we installed the “Rubber Sidewalks” product in Kelowna, BC. There was a new sidewalk being installed next to a boulevard of mature green ash trees. There was no existing sidewalk, just lawn. We got the construction crew to only remove minimal turf and organics from the surface and avoid cutting any roots. The grade was built up (and tied in to an older concrete sidewalk with gentle ramps). The large rubber panels were placed over a bed of sand. The sidewalk is still looking good today and the trees are healthy. There has been a bit of mild bending of the rubber panels due to roots but no tripping issues, and small snow plows drive across the surface in winter.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class="">If we did this over again, I think I would have used a coarse structural gravel underneath the rubber sidewalk (no fines). Basically a structural soil but no added compost – to help discourage root growth directly under the panels.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class="">Ian Wilson<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class="">City of Kelowna<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class=""><o:p class=""> </o:p></span></div><div class=""><div style="border-style: solid none none; border-top-width: 1pt; border-top-color: rgb(225, 225, 225); padding: 3pt 0cm 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span lang="EN-US" class="">From:</span></b><span lang="EN-US" class=""><span class="Apple-converted-space"> </span>CANUFNET <<a href="mailto:canufnet-bounces@list.web.net" style="color: purple; text-decoration: underline;" class="">canufnet-bounces@list.web.net</a>><span class="Apple-converted-space"> </span><b class="">On Behalf Of<span class="Apple-converted-space"> </span></b>Mark Carroll via CANUFNET<br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>July 13, 2020 12:04 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>Canadian Urban Forest Network <<a href="mailto:canufnet@list.web.net" style="color: purple; text-decoration: underline;" class="">canufnet@list.web.net</a>><br class=""><b class="">Cc:</b><span class="Apple-converted-space"> </span>Mark Carroll <<a href="mailto:environment1st@rogers.com" style="color: purple; text-decoration: underline;" class="">environment1st@rogers.com</a>><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [CANUFNET] Constructing Driveways within Critical Root Zones<o:p class=""></o:p></span></div></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="border: 1pt solid rgb(156, 101, 0); padding: 2pt;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 13pt; background-color: rgb(160, 0, 0);" class=""><b class=""><span style="color: white;" class="">CAUTION:</span></b><span style="color: white;" class=""><span class="Apple-converted-space"> </span>External email - Check before you click!<o:p class=""></o:p></span></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div class=""><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 11pt; font-family: Calibri, sans-serif;">I don't have an example of a driveway being elevated, but there are examples in the City of Toronto where the house was built this way. The addition was built on stilts to preserve the roots. A full concrete pad was elevated and the addition was built on top. It is not uncommon for this to be done. England has made some good practices for preserving their trees. They have actually built basements under the roots of trees. There are engineered peers that can be drilled down to the 2.5 to 3 meter depth that will support the needs of a carrying load to build a driveway and keep the root zones intact.<o:p class=""></o:p></p><div id="ymail_android_signature" class=""><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 11pt; font-family: Calibri, sans-serif;">Mark Carroll<br class="">ISA Certified Arborist, Qualified Arborist Tech<br class="">All around nice guy<br class="">Taking our environment first<br class="">Thanks for connecting...<o:p class=""></o:p></p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><blockquote style="margin: 5pt 0cm 15pt;" class="" type="cite"><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: Arial, sans-serif; color: rgb(109, 0, 246);" class="">On Fri., 10 Jul. 2020 at 11:26 a.m., Astrid Nielsen via CANUFNET<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: Arial, sans-serif; color: rgb(109, 0, 246);" class=""><<a href="mailto:canufnet@list.web.net" style="color: purple; text-decoration: underline;" class="">canufnet@list.web.net</a>> wrote:<o:p class=""></o:p></span></div></div></div><div style="border-style: none none none solid; border-left-width: 1pt; border-left-color: rgb(109, 0, 246); padding: 0cm 0cm 0cm 15pt; margin-top: 7.5pt;" class=""><div id="yiv0561002500" class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Hello Canufnet members,<span class="Apple-converted-space"> </span><o:p class=""></o:p></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">I have a client that is building two homes on an infill lot where there is a very large (106 cm), healthy silver maple. He is very willing to explore different options for working around the tree that would cause minimum disruption to the roots. <o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Does anyone have examples of building driveways within the critical root zones of large trees that have managed to prevent significant root damage and tree decline? Specifically, he is considering a type of elevated driveway that would not require the severing of roots or significant soil compaction, and dissipate the pressure through posts. Although the posts would cause some root damage, it would be significantly less than excavation for a standard driveway. If anyone has examples of this type of engineering, I would be grateful if you could share it with me.<o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Thank you,<o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Astrid<o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: Verdana, sans-serif;" class="">______________________________________</span><o:p class=""></o:p></div><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="font-size: 12pt; font-family: Verdana, sans-serif;" class="">Astrid Nielsen, </span></b><span style="font-family: Verdana, sans-serif;" class="">MFC</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Verdana, sans-serif;" class="">Ontario Registered Professional Forester</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Verdana, sans-serif;" class="">ISA Certified</span><span style="font-size: 12pt; font-family: Verdana, sans-serif;" class=""> Arborist®</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Verdana, sans-serif;" class="">ISA Tree Risk Assessment Qualified</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><a href="mailto:astrid.nielsen@dendronforestry.ca" target="_blank" style="color: purple; text-decoration: underline;" class=""><span style="font-size: 9.5pt; font-family: Verdana, sans-serif;" class="">astrid.nielsen@dendronforestry.ca</span></a><o:p class=""></o:p></div></div><div class=""><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: Verdana, sans-serif;" class="">+1.613.805.WOOD (9663)</span><o:p class=""></o:p></div></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: Verdana, sans-serif;" class=""><a href="http://www.dendronforestry.ca/" target="_blank" style="color: purple; text-decoration: underline;" class="">www.dendronforestry</a></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></blockquote></div></div></div></blockquote></div><br class=""></div></body></html>