UKTC Archive

Re: AAGN12 - Guide to the use of cellular confinement systems near trees

Subject: Re: AAGN12 - Guide to the use of cellular confinement systems near trees
From: Wayne Tyson
Date: Oct 30 2020 04:43:13
Where is the research on performance over time, especially with fully
mature trees? The forced zig-zagging of near-surface radial roots seems to
invite weak spots.

On Thu, Oct 29, 2020 at 4:26 AM elsteadbysea@xxxxxxxxxxx.com <
uktc@xxxxxx.tree-care.info> wrote:

One has to sometimes!

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info>
On Behalf Of Jim Quaife
Sent: 29 October 2020 11:29
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: AAGN12 - Guide to the use of cellular confinement systems
near trees

Show-off!

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:
uktc-request@xxxxxx.tree-care.info] On Behalf Of
elsteadbysea@xxxxxxxxxxx.com
Sent: 29 October 2020 11:13
To: UK Tree Care
Subject: RE: AAGN12 - Guide to the use of cellular confinement systems
near trees

I wash my drive regularly Jim, but only one in street that does!
Looking out the window now, one across road covered in weeds and moss!

Phillip

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info>
On Behalf Of Jim Quaife
Sent: 29 October 2020 11:20
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: AAGN12 - Guide to the use of cellular confinement systems
near trees

We have built up layers of cellweb to compensate for side-slopes ever
since it was introduced.  We also worked with an engineer to solve the
problem of keying stone kerbs.  Installed properly cellweb has a good
degree of lateral retention, but the worst problem is block pavers on
curves shifting sideways due to the scrubbing effect of tyres.  The kerbs
have to be able to resist that force.
As a more general observation, we take account of a tree's full rooting
area (inevitably an estimation) because the focus on the RPA alone ignores
root morphology.
I am happy with the concept of the RPA and yes roots tend to be
concentrated near the surface (although the mass proportion of the deeper
roots does need to be a consideration - subsidence anyone?) but what's
wrong with a trial hole or two?
I might be a dinosaur but I can still wield a digging chisel and
shuv-holer!
What I like about this guidance is that it provides the technical
explanations of the various factors.
Most no-dig installations are relatively straightforward, but where
modifications are necessary the tech stuff is invaluable for justification.
Jim

Pressure-washing the surface every year?  Derek Patch's response to that -
"yeah, that's going to happen!"

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:
uktc-request@xxxxxx.tree-care.info] On Behalf Of Jerry Ross
Sent: 29 October 2020 10:45
To: UK Tree Care
Subject: Re: AAGN12 - Guide to the use of cellular confinement systems
near trees

Useful to have a guide to supersede the venerable APN12!
I'm not sure about the way it deals with uneven ground though, by piling
up sharp sand or clean angular aggregate to fill in the dips. (par. 17,
p9). A colleague of mine (who has laid acres of the stuff) recommends
laying the geocells directly onto slightly uneven land and levelling
*above* the cells, and where there are deeper hollows, using thicker or
doubling up the geogrid, as in the diagram attached.
It seems to make good sense to me to put the additional stone *above* the
protective layer, not below it.



On 27/10/2020 14:32, Ben Rose wrote:
The new good practice guide for the use of cellular confinement systems
near trees is now available. For those unfamiliar with cellular confinement
systems, they can be used as temporary ground protection or to create
low-impact surfacing near trees.

A free download of the document is available on the Arboricultural
Association
website:https://www.trees.org.uk/News-Blog/Latest-News/New-guide-to-us
e-of-cellular-confinement-systems-n

I hope that you find this guide to be informative and of assistance.

Best regards,

Ben








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The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits https://www.stockholmtreepits.co.uk




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The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
https://www.stockholmtreepits.co.uk




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The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
https://www.stockholmtreepits.co.uk