Repairing Soil Subsidence with Soil Stabilization and Chemical Grouting

Stabilizing soils for repairing soil collapse and soil subsidence

Soil Subsidence can cause severe damage to foundations. The collapse of the soils can lead to the downward movement of a foundation resulting in unlevel slabs and cracked foundations. This is why treating subsidence is important and that is why CST offers a cost-effective repair solution.

Polyurethane Chemical Grouting is a non-invasive solution for treating subsidence.  The polyurethane stabilizes and densifies the soils by filling the annular voids and space.  The polyurethane is a highly-dense, specially formulated structural polymer that has significant weight-bearing capacity and foundation lifting capability.

The polyurethane chemical grout has a small footprint, and can be injected through holes that are smaller than a nickel. Once the polymer is injected, it quickly travels and expands through the soil, densifying it and increasing weight bearing capacity.  The stabilization process prevents additional soil collapse and mitigates against settlement.

Soil Subsience Brick SeparationA major symptom of soil subsidence is developing cracks in walls.  The cracks are thicker than hairline cracks and may be found in the plaster or brick work outside.  Common soil subsidence indicators are:

  • Cracks appear in the brick, concrete, walls and floors
  • Floors become uneven or are tilted
  • Unexpected structural damage occurs
  • Doors and windows do not open/close properly
  • Gaps appear between frames and doors/windows
  • Structure appears to lean to one direction more than expected
  • Water starts to run in the wrong direction the sink or bath
  • Drains work poorly or not at all
  • Chimney stack or chimney breast shows sign of leaning and cracks

Benefits of Treating Soil Subsidence

  • Extends building’s useful life
  • Restores structural stability of the roof and walls and the operational use of windows and doors
  • Building value is maintained or potentially increased
  • Prevents future building settlement and damage
  • Can prevent or repair against tripping hazards or safety hazards