"...consider the spatial needs of a tree and its root system when designing the layout of new sidewalks and driveways. Just how much space is required depends on a tree's sensitivity to root cutting and its future size (Table 1). It's best to locate sidewalks and driveways outside the anticipated PRZ. At a minimum, walkways should be at least three feet from the trunk of a tree; driveways may cover up to half the distance from the tree's PRZ to its trunk, as long as no excavation occurs. No tree should be boxed into an area less than eight feet by eight feet by three feet deep, with larger trees receiving at least 300 cubic feet of root/soil volume."
To find out more about the tree growth requirements vs paving stones, try this link:http://www.extension.umn.edu/distributio...
With Sweetgum you may very likely have a problem, due to the suckering nature of the root system. See: http://www.extension.umn.edu/distributio...
Plums: http://www.extension.umn.edu/distributio...
You have to figure that when you look at the grown tree, anything above the soil is like a mirror to what is under the ground. So to avoid having roots raise and buckle your pavers, simply make sure that you give the tree adequate space to grow away from your drive.
Happy Yardening!
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