Building on Unstable Ground

Building on Unstable Ground

Unstable or variable ground requires investigation before foundations, drainage or retaining structures can be designed responsibly.

Identify the mechanisms

Soft soils, uncontrolled fill, slopes, groundwater and nearby excavation can produce different movement risks.

Investigate proportionately

Desk study, inspection, boreholes or testing should be selected by the geotechnical and structural team.

Design beyond the footing

Drainage, temporary works, retaining structures and monitoring may be as important as the final foundation type.

Practical checklist

• Do not infer ground quality from appearance
• Coordinate geotechnical and structural design
• Record conditions encountered during excavation

Foundation solutions should never be chosen from a generic article or price list.