I am patching an asphalt driveway which has been buckled in a few places by roots. Without knowing the best approach, I dug up one of the smaller areas and saw that the root came in from the side of the driveway and was less than a foot below the surface, but deeper than the asphalt layer. I dug up and cut out a 4ft section of 3-4" dia pine tree root. I wonder if is really necessary to remove the root or just cut it at the driveway edge? It would make patching the larger areas easier if I didn't have to dig up the root.
I have several bags of quikcrete cold patch. Should I be applying some type of sealer at the edge of my patch?
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Not going to work. Even if you cut off the root it's going to come back and do it again at some point.
But digging it all out cutting the root back at least 4 ft. and removing the old root, back filling with compatable fill and adding the patch will give you a few years.