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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