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Critical root zone distance?

flushcut

TreeHouser
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Jan 15, 2011
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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

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Jul 21, 2019
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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.
 

SeanKroll

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Oct 13, 2016
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Olympia, WA
1' of radius per inch of DBH/ DBH was one definition for CRZ (80% of the roots).

There are better ones. It came up in TB. Age, vigor, and size all influence it. Species should, too.
 

flushcut

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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.
 

Altissimus

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Jul 1, 2008
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southern Vermont
Sounds like your pulling stumps ? Most times I cleaned out the woods we usually have flushcut the stumps , no impact to the roots of the preservation trees
 

flushcut

TreeHouser
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Jan 15, 2011
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Location
Delavan, WI
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Thank you.
New home construction site.
 

Wood Collector

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Aug 21, 2014
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312
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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