Installation of Kerbs within the root protection area.

[Chris at eden]

Hi There

 

I've just been looking at NJUG Vol 4 and have a question.

 

The tree protection zone is divided into 3 different zones: the prohibited zone (within 1 metre of the stem), the precautionary zone which extends to 4x the tree circumference, and the permitted zone which is outside the other two.

 

Does anyone know if '4x the tree circumference' means 4x the stem circumference (and if so at what height) or is it 4x the circumference of the whole tree (seems a bit over the top)

 

How does this compare with the BS:5837 root protection area (12 times the DBH).

 

Thanks in advance.

Callum

 

Its the same more or less. Circumference is just over three time diameter. 3.142 to be exact. So four times circ is 12 times dial.

 

For the record though both are measured at 1.5m not DBH. DBH is 1.3.