It makes some people nervous (the type who like single, one size fits all
"standards") but I've found flexibility and creativity to be most effective.
The goal is that the trees are protected. On the site I mentioned that used
plywood, it saved them money becuase they used supplies in hand. They
volunteered themselves to supplement the posts with angled bracing to grade
as well. It involved them in the process rather than being arbitrary with
them.
There are times when one or more short periods of activity are unavoidable.
You can set the fences permanently to makes those areas accessible (constant
and unlimited access to those areas and resulting compaction) or you can set
the fences for maximum protected area and allow for temporary shifting for
short term activity with supervision (with chips and plywood or low ground
pressure equipment or hand digging or whatever minimizes the root disturbance.
Wooden slat snow fence seems effective if steel posts are use particularly
the sort designed for fencing with the little clips to slide the fence wire
into.
Here we have suppliers who actually rent or lease chain link fencing for
construction sites. The market is much, much bigger than tree protection.
Many construction sites require such fencing for both safety and security. I
wonder if that turns out cheaper than purchasing single use plastic snow
fence with posts and Julian's top and bottom rails.
SC
----- Original Message -----
From: Julian Dunster
To: UK Tree Care
Sent: Friday, December 16, 2005 6:38 PM
Subject: Re: Root protection area calculator
With regard to fencing type, my experience has been that chainlink is good
because it is expensive (incentive to maintain it) and not easily damaged
(relatively speaking). Plywood hoarding works well if sturdy posts are
used.
Plastic snow fence is ok if it is well attached to sturdy posts and has a
top and bottom rail. Snow fence is useless when wired on to rebar (it
slides
down) and not much better on a wooden framework if it is not properly
stapled. Movable steel mesh panels work well, as long as the contractor
does
not shuffle them backwards every time he needs more space. On some sites I
have had a sign put on the fence that states the appraised value of the
tree
and notifes the reader that the dollar amount shown is what it will cost if
he / she screws it up. If nothing else, most contractors stop long enough
to
read the signs and think twice.
jd
----- Original Message -----
From: "Scott Cullen" <dscottcul@xxxx.net>
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Sent: Friday, December 16, 2005 2:42 PM
Subject: Re: Root protection area calculator
I actually did a little spread sheet exercise and proved to myself that the
circumference is shorter. But you are right about contractors and
engineers
having difficulty with non straight lines!
If we use chain link fence the standard section in 8 feet (actually the
fencing is in long rolls but the top pipe sections are 8 feet between
posts.
One site recently had a huge supply of plywood in 8 foot sheets so they
used
those. In both cases the sections approximate a curve. Snow fence comes
in
long rolls and no top section so the radius is just a function of how many
posts you want to use.
On many sites the individual RPA (TPZ, CRZ, whatever) circles overlap so
much that a single fence protecting the joined areas may result.
SC
----- Original Message -----
From: Chris Skellern
To: UK Tree Care
Sent: Friday, December 16, 2005 5:22 PM
Subject: Re: Root protection area calculator
From: "Scott Cullen" <dscottcul@xxxx.net>
> My geometry is rusty. But is the circumference of a circle less that
the
> rectalinera permieter of the same area? So cost for liner amount of
fence
> would be less.
> SC
Well yes it is.
Im wondering whether some builders can 'cope' with fencing a circle with
straight wiremesh panels. Especially when a braced scaffold support system
needs to be efficiently used.
Im personally all for circles.
BS mentions the use of a square of similar area and suggests use of
Polygons
within the TPP.
CS
> From: Chris Skellern
> Isn't the square size useful as its easier to fence a square than a
> circle?
> CS
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