Site classification
Soils are classified according to their stability. Soil samples are taken on the site to determine soil class. A geotechnical engineer's report will clearly state the likely soil conditions and recommend a suitable footing system.
| Type of soil | Description | Class |
|---|---|---|
| Rock | Rock sites have no ground movement | A |
| Sand | Sand has little or no movement | A |
| Clay, slightly reactive | Slight ground movements due to moisture changes | S |
| Clay, moderately reactive | Moderate ground movements due to moisture changes | M |
| Clay, highly reactive | High ground movements due to moisture changes | H |
| Clay, extremely reactive | Extreme ground movements due to moisture changes | E |
| Problem | Sites which include soft soils, loose sands, landslip, mine subsidence, collapsing soils, erosion, fill and abnormal moisture conditions | P |
Table 1: Site classification