Homeowners in Albany, NY have a concrete walkway leading to their front porch that had sunken significantly. Our PolyLevel system was used to raise it back to its intended position. This was done by injecting a poly-urethane polymer underneath the slabs. This light-weight high-density polymer is a more ideal solution than mud-jacking. Mud-jacking creates more weight beneath the slab and will only make it sink again in the future. It is also waterproof and environmentally friendly so you don't have to worry about it ever washing out.