UKTC Archive

RE: Heave Risk Assessment

Subject: RE: Heave Risk Assessment
From: Mark Mackworth-Praed
Date: Jan 20 2021 14:53:47
Hello Trevor

In the past I've found the 'ready reckoner' for heave prediction Giles Biddle 
sets out on pp263-264 of Vol 1 of 'Tree Root Damage to Buildings' very 
useful. As he says there, a highly simplified approach and not a substitute 
for more detailed assessment, but helpful in giving an idea of the likely 
risk of heave (in % terms) and its potential duration (in years). And it 
gives one a bit more to say than just "maybe it will, maybe it won't", so can 
assist in persuading relevant folk to get a proper assessment done.

All the best
Mark M-P

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of "theapsy@xxxxxx.com"
Sent: 20 January 2021 13:48
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Heave Risk Assessment

That's how I understand it Alastair.
Cheers
Trevor 
    On Wednesday, January 20, 2021, 01:31:55 PM GMT, Alastair Durkin 
<adurkin@xxxxxxxxxx.gov.uk> wrote:  
 
 I'll probably get shot down in flames here by colleagues who deal with 
subsidence more often than me, but for 'heave' to occur in this specific 
instance my understanding is that a persistent soil moisture deficit would 
already need to have been in existence when the bungalow was built, and the 
foundations not taken account of that. If subsidence then went on to occur, 
through the continued growth of the tree, then there would be a possibility 
of the ground 'recovering' beyond the original build level eventually 
resulting in 'heave' (although technically still recovery I suppose). With 
that in mind, it might be very difficult to predict in this circumstance. 
There will certainly be recovery if the tree is felled you'd think, but 
whether the recovery takes it past the original build level.......

Alastair



-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of "theapsy@xxxxxx.com"
Sent: 20 January 2021 12:42
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Heave Risk Assessment

Hi Jim,
The Oak is probably about 70-80 years older than the (subsidence damaged) 
bungalow.
I was worried about recommending the Oak to be felled - before checking 
whether or not heave might occur after the expected recovery.
Cheers
Trevor  

    On Wednesday, January 20, 2021, 12:35:52 PM GMT, Jim Quaife 
<jq@xxxxxxxxxxxxxxxxx.co.uk> wrote:  
 
 When subs has occurred the removal of the offending tree is usually 
recommended by insurers as the correcting action.
The mechanism that causes heave is different to subsidence - the reverse of 
subs is re-wetting.
I don't know the circs of your case but don't get the two confused.
Jim

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
[mailto:uktc-request@xxxxxx.tree-care.info] On Behalf Of "theapsy@xxxxxx.com"
Sent: 20 January 2021 11:28
To: UK Tree Care
Subject: Heave Risk Assessment

Hi All,
Does anyone know a good firm who undertakes heave risk assessments?
A bungalow has subsided, a mature Oak (much older than the bungalow) growing 
a few metres away on heavy clay soil is almost certainly the main cause, but 
I need to check on the risk of heave before advising further.
Cheers
Trevor 


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