Slab stabilization is often required when slabs lack support, but may or may not be settled. Slabs can crack when loads exceeding its capacity are applied.
Slab/joint stabilization applications require the voids to be filled to eliminate movement and offer support. Polyurethane foam is specifically designed for joint/slab stabilization applications due to its reaction time and expansion strength. It will take longer to expand, allowing for better coverage under the slab or down a joint. Remember that when the foam leaves the injection port it is in a liquid form which allows it to penetrate any cracks below the slab. Once the foam enters these cracks it begins to expand and stabilizes the soil.