UKTC Archive

RE: Water Demand of Cotoneaster

Subject: RE: Water Demand of Cotoneaster
From: Alastair Durkin
Date: Sep 08 2017 09:51:59
I'm no quantity surveyor, but I'm led to believe from my many conversations 
with builders over the years that a relatively small difference in foundation 
depth can result in considerable extra expense.


-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
[mailto:uktc-request@xxxxxx.tree-care.info] On Behalf Of Bill Anderson
Sent: 08 September 2017 10:31
To: UK Tree Care
Subject: Re: Water Demand of Cotoneaster

My way of looking at this Jon would be you're already digging quite a deep 
foundation because of the soil type. Assuming that a neighbour might plant a 
tree with a high water requirement is only going to make 500 mm or so 
difference, so why not get it right?

However I do accept your overall cost argument, I just wouldn't have thought 
the cost difference would be that significant in the anticipated life of the 
house. Let's not get into how screwed up the property market might be.....

Bill.

On 8 September 2017 at 09:00, Jon <j.heuch@xxxxxxxxxxx.com> wrote:

.....   if you design a foundation that only considers trees that are
already present,
rather than trees that might be planted (and grown, and removed) in
the future, then it's not really an adequate foundation.
Getting these things right at an early stage is likely to be a
relatively minor cost in comparison to future rectification. Innit?
It's an interesting point you make Bill but clearly the answer is it
all
depends:
What does "get things right" mean? Digging a few centimetres deeper
for the foundation? Digging a metre deeper? Using different foundation 
designs?
Clearly there is an escalating cost, depending on how far you go and
remember you will need to do this for ALL houses in the appropriate soils.
150,000 homes per year at £1000 per house (for example) is not a
relatively minor cost for society at a whole.
It's all a case of balance and trade off. Is the current balance wrong?
Could it be improved? Considering a large proportion of subsidence
claims is on older houses where this discussion is irrelevant to a
large degree the focus needs to be on what problems occur on modern
houses, taking away inadequate conservatories and poorly designed and 
executed extensions.
Might a few million per year on pollarding/tree management/tree
removal be both cheaper and lead to a much better tree stock?
There's a research project for someone!
Jon




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