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Critical root zone distance?

flushcut

TreeHouser
Joined
Jan 15, 2011
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17,203
Location
Delavan, WI
Howdy, what is the formula used to determine critical root zone set back? It seems this year is turning out to be the “year of the lot clearing” and I have several big stately oaks and walnuts that are questionable and the customer would like to retain them if possible.
 

lxskllr

Treehouser
Joined
Jul 21, 2019
Messages
8,599
Location
MD USA
That's what I always heard, but how does that work for a forest tree? You can have a pretty beefy tree without much of a canopy all things considered. Seems like there should be a larger root zone than the canopy would indicate.
 

flushcut

TreeHouser
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Jan 15, 2011
Messages
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Location
Delavan, WI
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Forest habitat but first generation habitat. We removed a lot of nice second growth habitat trees tall and straight.
 

Wood Collector

TreeHouser
Joined
Aug 21, 2014
Messages
310
Location
Hills District NSW
I'll try and find one of my old reports where I overlayed the proposed building plans onto a tree protection/structural root zone map and it showed what was impacted and then one could calculate the encroachments. Generally anything into the SRZ is a removal, anything greater than 10% into the tpz without technical justification e.g. old retaining wall being replaced then reinstated is a removal
 
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