What is Deep Foamjection, and when would I need it instead of standard leveling?

Standard lifting addresses the void right under the slab. Deep Foamjection goes further down, injecting foam deeper into weak or loose soil to stabilize the ground itself before lifting the slab on top of it. You need it when the problem isn’t a shallow void but soft soil at depth that won’t hold a normal lift. If your settlement keeps coming back, or the slab sits over poorly compacted fill, this is the approach that gets ahead of it.