[CANUFNET] Constructing Driveways within Critical Root Zones

[Julian Dunster]

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) [ 
https://www.tensarcorp.com/Systems-and-Products/Tensar-Triax-geogrid]. 
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.

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
www.dunster.ca
www.treelaw.info
www.rinntech.info

On Fri/7/10/2020 8:15 AM, Astrid Nielsen via CANUFNET 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)
>
> www.dendronforestry <http://www.dendronforestry.ca>
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