The lifting force is generated as the material is injected through the concrete via a small 3/8” pre-drilled hole; as the material is introduced under high pressure in a liquid state it spreads out under the bottom of the concrete. When the chemical reaction begins to occur, the material expands approximately 15-25 times its liquid volume, this expansion of the material produces pressure that has a lifting capacity of 6,000 lbs. per square foot under the concrete slab. Its important to have a highly experienced technician perform this work as it’s critical to know exactly how much material to inject and where you should inject the material to achieve the desired amount of lift in the proper locations. You can only lift concrete once!