The approach usually involves building a physical cut-off wall or barrier with very low permeability across the perimeter of the foundation to avoid the intrusion of groundwater in the areas of foundation or slab. 
Vertical cutoff walls are sheet pile walls, geomembrane walls, and concrete slurry. 

Grouting and deep soil mixing, are also possible, and all are placed after excavating a trench along the foundation perimeter. 


The procedure requires soil moisture sampling to determine the depth and percentage of water affecting the foundation. 


Cut-off walls are only recommended where groundwater conditions cannot be controlled with French drains or other water mitigation methods.

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