Unlike your average grinder, our custom-designed head gently removes the raised portion of asphalt or concrete. Rarely is an overlay required as our process applies just enough pressure to keep the remaining material intact. Most often, you are left with a thinner layer of asphalt/concrete still covering the affected area. If the bump is more severe and the root has broken through, we can grind the roots down to make it level the rest of the path. A simple cold patch and your problem are solved. The removal typically gets with 1/8 of an inch of being level. It will likely be another 5-8 years before bumps start recurring.