Native Soil

Native soil, also known as parent soil, is the first layer of earth exposed after removing the top humus layer. It is a naturally formed soil layer that has developed under geological conditions unaffected by human activity.

Native soils are always natural formations, originating from geological processes such as weathering, sedimentation in aquatic environments, and others.

Types of Parent Soils

Rocky Soils

• Hard: Includes basalt and granite.
• Soft: Includes limestone and sandstone.

Non-Rocky Mineral Soils

a) Stony soils – containing weathered material such as chalk marl, shale, clayey weathered deposits, and clay rubble.
b) Coarse-grained soils – including gravel, clayey gravel, sand-gravel mix, and clayey sand-gravel mix.
c) Fine-grained soils – consisting of sand (non-cohesive), clays, and loams (cohesive).

Non-Rocky Organic Soils

• Humus-rich soils, alluvial deposits, and peat.

Best Soil for Building Construction

The most suitable layer for constructing a single-family house is the parent mineral soil layer. Construction work can only begin after removing the humus layer, exposing the native soil layer as a stable foundation.