Drill a hole all the way through the sunken part of the concrete with your masonry drill. Connect the grout pump to the hole and pump the grout mixture (pond sand and concrete) into the sidewalk until it is level. A settling or sinking sidewalk is not only unattractive, but it can also...
Pull out the tiles, re-grout, and set them back in place with grout that allows for expansion such as siliconized grout. Isn’t that crazy?? I also speculated that a large exterior tree may have been the culprit of the ground moving. We went outside looked around and he basically said...