How much of the tree roots can be disturbed before the tree will decline?
Tree roots grow to that of 2.5 times the height of the tree. The area under the canopy of the tree is commonly referred to as the critical root zone. Some tree species are more tolerant of root loss and disturbance than others. As a general rule, the minimal protected root zone radius should be 1-1.5 times the tree diameter measured at breast height (4.5 feet above ground). In other words, if a tree diameter is 10 inches, then the area under a tree needing protection is 10-15 feet out from the trunk in all directions.

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10. How much of the tree roots can be disturbed before the tree will decline?