The problem
- Cause
- Groundwater and stormwater moving through loose soil
- Soil
- Washed out from under slabs, stairs, and foundations
- Result
- Voids and soil that can no longer carry the load
- Risk
- Settlement of the slab, footing, or foundation
- Cement grout
- Adds weight that can make settlement worse
- Digging it out
- Costly, and the structure has to be rebuilt






