Many different types of soil can be encountered on construction sites. Variations of soil within Sri Lanka reflect the effects of climate, lithology, and terrain on the soil-forming processes. The importance of the characteristics of soil, such as the size and nature of particles, their density, and structural properties, means there is a soil for every requirement.
The characteristics of red soil have a great impact on strength, imperviousness, and anti-pest control. It is dark red in color and feels soft, dry, and crumbly to the touch. This Red soil is used for filling purpose.