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<p>Carefully remove loose surface materials. Place a layer of
landscape fabric on the ground to prevent fines from moving
downwards, and on top of that a layer of tensar grid (plastic
geomesh) [ <a
href="https://www.tensarcorp.com/Systems-and-Products/Tensar-Triax-geogrid">https://www.tensarcorp.com/Systems-and-Products/Tensar-Triax-geogrid</a>].
Add rock crush of a suitable size on top and build road bed up
from that. Allow light compaction of loose rock to settle it down.
The geogrid spreads loads and prevents compaction thus allow for
root growth to continue. It also helps to distribute any loads
that roots may later create under the road surface. <br>
</p>
<pre class="moz-signature" cols="72">On Behalf of Dunster and Associates Environmental Consultants Ltd.
Dr. Julian A Dunster R.P.F., R.P.P.., M.C.I.P., ISA Certified Arborist,
ASCA Registered Consulting Arborist # 378,
ISA Tree Risk Assessment Qualified
Honourary Life Member ISA + PNWISA
North American distributor for Rinntech
<a class="moz-txt-link-abbreviated" href="http://www.dunster.ca">www.dunster.ca</a>
<a class="moz-txt-link-abbreviated" href="http://www.treelaw.info">www.treelaw.info</a>
<a class="moz-txt-link-abbreviated" href="http://www.rinntech.info">www.rinntech.info</a>
</pre>
<div class="moz-cite-prefix">On Fri/7/10/2020 8:15 AM, Astrid
Nielsen via CANUFNET wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAGa420SwdYfGzM8cXvZa8isxWtCMQVc5uAXzBYvsydUiJX4oBw@mail.gmail.com">
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<div dir="ltr">Hello Canufnet members,
<div><br>
</div>
<div>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. </div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Thank you,</div>
<div><br>
</div>
<div>Astrid</div>
<div><span style="font-family:verdana,sans-serif"><br>
</span></div>
<div><span style="font-family:verdana,sans-serif">______________________________________</span>
<div>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
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<div dir="ltr"><font
face="verdana,
sans-serif"><span
style="font-size:small"><b>Astrid
Nielsen, </b></span></font><span
style="font-family:verdana,sans-serif">MFC</span></div>
<div><font face="verdana,
sans-serif"><span
style="font-size:small">Ontario
Registered
Professional
Forester</span></font></div>
<div dir="ltr"><font
face="verdana,
sans-serif"><font
size="2">ISA
Certified</font><span
style="font-size:small"> Arborist®</span></font></div>
<div><font face="verdana,
sans-serif"><span
style="font-size:small">ISA
Tree Risk Assessment
Qualified</span></font></div>
<div dir="ltr"><font
face="verdana,
sans-serif"><span
style="font-size:small"><br>
</span></font></div>
<div><a
href="mailto:astrid.nielsen@dendronforestry.ca"
style="font-family:verdana,sans-serif;font-size:12.8px" target="_blank"
moz-do-not-send="true">astrid.nielsen@dendronforestry.ca</a><br>
</div>
<div dir="ltr">
<div>
<div><font
face="verdana,
sans-serif">+1.613.805.WOOD
(9663)</font></div>
</div>
<div><font
face="verdana,
sans-serif"><br>
</font></div>
<div><font
face="verdana,
sans-serif"><a
href="http://www.dendronforestry.ca"
target="_blank"
moz-do-not-send="true">www.dendronforestry</a></font> </div>
</div>
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