Heave

[mjhayes]

Can anyone give me some advice on heave when removing trees, I know what it is but my clients have been told by a surveyor that they need to be careful if they wish to remove a certain tree.

 

Is there any way it can be prevented or. The tree in question is a mature oak. Should i be worried?

 

Thanks

 

Matt

[born2trot]

As the cutter you only need to worry about the tree falling on your head ..

[Jesse]

Be very careful what you say, my advice to you is to politely tell your client that you are not insured to provide such advice and to source advice from an expert. Oak is a HIGH water demand tree,(NHBC Standards) foundation depth, soil type , foundation type ,age of property- age of tree, condition of tree, structural condition of property , distance from tree to property , ground level features . All of these things would be considered when carrying out Subsidence Risk Assessments, And you could be held accountable for the advice you give- verbal or written. SRA's- lenders require insurances to be in place for a period of 5 years to cover any risk from both Direct and Indirect Damage , Hope that helps.

[woody paul]

Get house holders insurance company to get a surveyor to look and say what to do then the ball is in there court. Ive know it to take 5 years to remove a tree, reduce by a % and leave a year or two, reduce again back further and leave again and then fell. This allows the ground to re-wet slow, but this may have all changed.

[William]

Ive know it to take 5 years to remove a tree, reduce by a % and leave a year or two, reduce again back further and leave again and then fell. This allows the ground to re-wet slow, but this may have all changed.

 

Wouldn't this be a slow way of getting to the inevitable soil condition? Remove over 5 years or remove over 1 day - the soil will re-wet to a post tree condition anyway won't it? Sooner rather that later I would say.

[William]

Oak is a HIGH water demand tree,(NHBC Standards) foundation depth, soil type , foundation type ,age of property- age of tree, condition of tree, structural condition of property , distance from tree to property , ground level features . All of these things would be considered when carrying out Subsidence Risk Assessments.

 

Size of tree must be important too. A 4m oak can not have a higher water demand than a 20m tulip tree can it?

[Jesse]

Size of tree must be important too. A 4m oak can not have a higher water demand than a 20m tulip tree can it?

 

NHBC Standards chapter 4.2 sets out the criteria for carrying out the calculations and yes mature tree height is how the zone of influence is calculated Oak being based on 20m mature tree height its then down to the surveyor to also then take into account all other considerations including all other woody vegetation which may have the potential to cause damage to a structure including shrubs and climbers . Its a fascinating subject.

[treequip]

NHBC Standards chapter 4.2 sets out the criteria for carrying out the calculations and yes mature tree height is how the zone of influence is calculated Oak being based on 20m mature tree height its then down to the surveyor to also then take into account all other considerations including all other woody vegetation which may have the potential to cause damage to a structure including shrubs and climbers . Its a fascinating subject.

 

 

 

NHBC is Natinal House Building Council, is it not?

 

Should arboriculture be back working a formula intended to advise builders about trees?

[Mark Bolam]

No we shouldn't Treequip, but the NHBC were fairly well informed when setting out their criteria.

 

I think Jesses first post nailed it.

 

If a big tree is near a house on clay soil you need pro help.

 

A little tree further away on more friable soil you need no help.

 

It's the bits in between that make Arbtalk.

[William]

mature tree height is how the zone of influence is calculated Oak being based on 20m mature tree height

 

What height does a tulip tree grow and what water demand does nhbc class it as?