Home Improvement Questions? Ask a Handyman for Answers
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I suspect that concrete around/leading up to the roots wouldn't hold up over time. A better approach would be to fill in the low spots with large crushed stone or even tailings (bigger rocks sifted out of gravel).
Unless the concrete is at least 3" thick it's likely to break up over time. The easiest option is to just haul in some stone and fill in the low spots.
You may have to add to the stone in a few years but it's better for the trees and will also allow some drainage
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Hi. like rick mention, concrete is not a good idea. Those root will still continue to lift the soil (and they are strong as a slow hydraulic jack). If the trees die, they will rot and make the soil sag, causing concrete base problem. If the win blow the oaks, the concrete will break in large chunk and lift with them.
If you don't like the gravel (a very good solution by the way), you can use paving stone. WIth them you can always fix relatively easily (and at no cost as you are handy) any waving that will eventually happen with growth root.
Please accept Rick solution instead of mine, he was here first.
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