Chemical Underpinning
If a structure’s foundation soils are too weak to support its weight, SlabJacker can inject the soil beneath the footing to increase its load bearing capacity. Commonly referred to as chemical underpinning or compaction grouting, the system uses high strength polyurethane resin to create solid underpins or a continuous section that will transfer weight down to a more stable foundation. Steel rods can also be embedded into the consolidated soil to provide effective resistance to movement and uplift. The system should be considered in instances where:
- foundation soils are too weak to support the existing structure and imposed load – If foundation soils have already sunk, chemical underpinning can be used effectively in conjunction with Slab Jacking or Void Filling to provide a total repair
- additions to a building or a change of use are planned that will increase the load placed upon the foundation
- foundation soil is unstable and slipping downhill
- foundation soils are subject to vibration from construction processes, heavy plant, traffic, or seismic activity.
