[CANUFNET] Constructing Driveways within Critical Root Zones RE: CANUFNET Digest, Vol 184, Issue 14
Mike James
mjames at deeproot.com
Tue Jul 14 10:48:12 EDT 2020
Hi Astrid,
We have done a similar project with a mature tree and new sidewalk installations.
No reason it should not also work for a driveway.
Hydrovac out the root zone on the driveway side to a depth of 6-700mm.
Leave any large or support roots but take out the smaller roots.
Compact a 100mm base of gravel and install a Silva Cell. (SC1X - 424mm height).
Assemble the Silva Cells around the roots that were left intact...build them into the Silva Cells.
Fill the Silva Cell with soil, put on the deck and backfill around the perimeter with washed rock.
A geotextile goes over the deck and you can build your driveway on top of the Silva Cells.
They meet vehicle loading standards.
Now you have a "breakout zone" of good uncompacted soil 424mm deep across the driveway.
The excavation/Hydrovac should be done in conjunction with an arborist to identify the support roots and the critical root structure that should remain.
This can be one large excavation or multiple 1.2m wide breakout zones across the drive way.
Michael James | General Manager
t 800 561 3883 m 604 220 9521
DeepRoot Canada Corp.
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Today's Topics:
1. Re: Constructing Driveways within Critical Root Zones
(Naomi Zurcher)
2. Re: Constructing Driveways within Critical Root Zones
(Ryan Senechal)
----------------------------------------------------------------------
Message: 1
Date: Tue, 14 Jul 2020 09:46:33 -0400
From: Naomi Zurcher <treerap at sprintmail.com>
To: Canadian Urban Forest Network <canufnet at list.web.net>
Subject: Re: [CANUFNET] Constructing Driveways within Critical Root
Zones
Message-ID: <8C49504C-B2DF-46B5-88A4-BE6BEA187C24 at sprintmail.com>
Content-Type: text/plain; charset="utf-8"
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.
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.
Naomi Z?rcher
> On Jul 14, 2020, at 9:22 AM, Charlotte Young via CANUFNET <canufnet at list.web.net> wrote:
>
> 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!
>
> Charlotte Young
>
> ~~~~~
> Get quarterly tip sheets on how to build strong organizations and work
> collaboratively for greater effect. Sign up here:
> https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fenvis
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> ~~~~~
> Charlotte Young, Ph.D., Facilitator~Graphic Recorder~Evaluator
> envision SYNERGY ~ environmental vision together Catalyzing
> collaboration for a healthy planet ? across sectors, silos and skill
> sets
> 120 Dewhurst Blvd. Toronto ON M4J 3J6
> envision-synergy.net
> <https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fenvi
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> rved=0> ~ pictureyourthoughts.com
> <https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fpict
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> erved=0> 416-778-4713; charlotte at envision-synergy.net
> <mailto:charlotte at envision-synergy.net>
> ~~~~~
>
>
>
> From: CANUFNET [mailto:canufnet-bounces at list.web.net
> <mailto:canufnet-bounces at list.web.net>] On Behalf Of Ian Wilson via
> CANUFNET
> Sent: July 13, 2020 5:17 PM
> To: 'Canadian Urban Forest Network' <canufnet at list.web.net
> <mailto:canufnet at list.web.net>>
> Cc: Ian Wilson <IWilson at kelowna.ca <mailto:IWilson at kelowna.ca>>
> Subject: Re: [CANUFNET] Constructing Driveways within Critical Root
> Zones
>
> Not a driveway example but I have an example of construction of a new sidewalk across a critical root zone.
>
> 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.
>
> 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.
>
> Ian Wilson
> City of Kelowna
>
> From: CANUFNET <canufnet-bounces at list.web.net
> <mailto:canufnet-bounces at list.web.net>> On Behalf Of Mark Carroll via
> CANUFNET
> Sent: July 13, 2020 12:04 PM
> To: Canadian Urban Forest Network <canufnet at list.web.net
> <mailto:canufnet at list.web.net>>
> Cc: Mark Carroll <environment1st at rogers.com
> <mailto:environment1st at rogers.com>>
> Subject: Re: [CANUFNET] Constructing Driveways within Critical Root
> Zones
>
> CAUTION: External email - Check before you click!
>
> 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.
>
> Mark Carroll
> ISA Certified Arborist, Qualified Arborist Tech All around nice guy
> Taking our environment first Thanks for connecting...
>
>
>> On Fri., 10 Jul. 2020 at 11:26 a.m., Astrid Nielsen via CANUFNET
>> <canufnet at list.web.net <mailto:canufnet at list.web.net>> wrote:
>> Hello Canufnet members,
>>
>> 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.
>>
>> 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.
>>
>> Thank you,
>>
>> Astrid
>>
>> ______________________________________
>> Astrid Nielsen, MFC
>> Ontario Registered Professional Forester ISA Certified Arborist?
>> ISA Tree Risk Assessment Qualified
>>
>> astrid.nielsen at dendronforestry.ca
>> <mailto:astrid.nielsen at dendronforestry.ca>
>> +1.613.805.WOOD (9663)
>>
>> https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.
>> dendronforestry%2F&data=02%7C01%7C%7C7a354ad7190940c6a32908d82802
>> 3229%7C7a8ed4b96a0b4839be94c2c098cbedd9%7C0%7C0%7C637303337194348113&
>> amp;sdata=NqG%2FOp%2F9ndGS%2FUUdvMxetDKi7F3qEycnlXE7LRTtPxw%3D&re
>> served=0
>> <https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww
>> .dendronforestry.ca%2F&data=02%7C01%7C%7C7a354ad7190940c6a32908d8
>> 28023229%7C7a8ed4b96a0b4839be94c2c098cbedd9%7C0%7C0%7C637303337194348
>> 113&sdata=U1obfOprqJ0E4ed4dfa6K099C3N0tcemHdDz%2FJe5bLY%3D&re
>> served=0>
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------------------------------
Message: 2
Date: Tue, 14 Jul 2020 07:16:30 -0700
From: Ryan Senechal <ryansenechal at gmail.com>
To: Canadian Urban Forest Network <canufnet at list.web.net>
Subject: Re: [CANUFNET] Constructing Driveways within Critical Root
Zones
Message-ID:
<CAJf+-wyUA5j6hK+vGAOL-2e62GTehosukSGAxvgt8h9YPRui4g at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Numerous poured in place products are advertised as permeable with rates of permeability information listed. Do you have information that brings permeability performance of flexible poured in place surfaces into question?
Ryan
On Tue., Jul. 14, 2020, 06:56 Naomi Zurcher via CANUFNET, < canufnet at list.web.net> wrote:
> 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.
>
> 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.
>
> Naomi Z?rcher
>
> On Jul 14, 2020, at 9:22 AM, Charlotte Young via CANUFNET <
> canufnet at list.web.net> wrote:
>
> 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!
>
> Charlotte Young
>
> ~~~~~
> Get quarterly tip sheets on how to build strong organizations and work
> collaboratively for greater effect. Sign up here:
> https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fenvis
> ion-synergy.net%2Fsubscribe%2F&data=02%7C01%7C%7C7a354ad7190940c6a
> 32908d828023229%7C7a8ed4b96a0b4839be94c2c098cbedd9%7C0%7C0%7C637303337
> 194348113&sdata=QA%2F6G%2FEIEiQ0bj6vtLxId3A%2Fc25LkYFlk8OZiuOSHbM%
> 3D&reserved=0
> ~~~~~
> Charlotte Young, Ph.D., Facilitator~Graphic Recorder~Evaluator
> envision SYNERGY ~ environmental vision together Catalyzing
> collaboration for a healthy planet ? across sectors, silos and skill
> sets
> 120 Dewhurst Blvd. Toronto ON M4J 3J6
> envision-synergy.net ~ pictureyourthoughts.com 416-778-4713;
> charlotte at envision-synergy.net ~~~~~
>
>
>
> *From:* CANUFNET [mailto:canufnet-bounces at list.web.net
> <canufnet-bounces at list.web.net>] *On Behalf Of *Ian Wilson via
> CANUFNET
> *Sent:* July 13, 2020 5:17 PM
> *To:* 'Canadian Urban Forest Network' <canufnet at list.web.net>
> *Cc:* Ian Wilson <IWilson at kelowna.ca>
> *Subject:* Re: [CANUFNET] Constructing Driveways within Critical Root
> Zones
>
> Not a driveway example but I have an example of construction of a new
> sidewalk across a critical root zone.
>
> 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.
>
> 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.
>
> Ian Wilson
> City of Kelowna
>
> *From:* CANUFNET <canufnet-bounces at list.web.net> *On Behalf Of *Mark
> Carroll via CANUFNET
> *Sent:* July 13, 2020 12:04 PM
> *To:* Canadian Urban Forest Network <canufnet at list.web.net>
> *Cc:* Mark Carroll <environment1st at rogers.com>
> *Subject:* Re: [CANUFNET] Constructing Driveways within Critical Root
> Zones
>
> *CAUTION:* External email - Check before you click!
>
>
> 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.
>
> Mark Carroll
> ISA Certified Arborist, Qualified Arborist Tech All around nice guy
> Taking our environment first Thanks for connecting...
>
>
> On Fri., 10 Jul. 2020 at 11:26 a.m., Astrid Nielsen via CANUFNET
> <canufnet at list.web.net> wrote:
> Hello Canufnet members,
>
> 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.
>
> 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.
>
> Thank you,
>
> Astrid
>
> ______________________________________
> *Astrid Nielsen, *MFC
> Ontario Registered Professional Forester ISA Certified Arborist?
> ISA Tree Risk Assessment Qualified
>
> astrid.nielsen at dendronforestry.ca
> +1.613.805.WOOD (9663)
>
> https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.d
> endronforestry%2F&data=02%7C01%7C%7C7a354ad7190940c6a32908d8280232
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> ed=0
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>
>
>
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