Very good question!!!!!!
Most of you non-woody roots are in the upper 4 inches of soil most of the time. many woody roots can be in upper 9".
#1 See - Troubles in the Rhizosphere for starters
#2 See Roots:
John A. Keslick, Jr.
Consulting Forester & Tree Expert
Beware of so-called tree experts who do not understand tree biology.
Storms, fires, floods, earthquakes, and volcanic eruptions keep reminding us that we are not the boss.
See Troubles in the Rhizo
face=Arial size=2>...</FONT></DIV><FONT face=Arial size=2>> Hi everyone - I
am planning on putting in a brick patio in my backyard<BR>> and would like to
put it next to a large pine tree (50 feet tall). My<BR>> question is
this - wince I need to dig down 6 - 8 inches to lay the<BR>> foundational
aggregate and the resulting brick patio literally right<BR>> next to the
tree, will I cause any permanent damage to the tree (or<BR>> even kill it),
by removing any roots within those 6 - 8"?<BR>> <BR>>