Soil Treatment for Foundations

This treatment consists in treating the soil under the building and around the chemical emulsion that could kill or repel termites. In this treatment, about 500 mm deep trenches are made along the external periphery of the wall of the building and 15 mm diameter holes at 150 mm centers are then made in the trenches close to the wall face. A holes should preferably extend up to the top of footing of foundations or to a depth of at least 500 mm while is lesser. These holes are then filled along with chemical emulsion within water and the back fill earth is also sprayed along with the chemical emulsion as it is returned to the trench by creating a barrier of poisoned soil along the external periphery of the building. The whole quantity of the chemical to be used in this treatment should be by the rate of 7.5 litres per square meter of the vertical surface of the masonry in foundation.

In case of RCC frame structure the chemical treatment should be applied to the soil in contact along with column side and plinth beams along external periphery of the building for a depth of 500 mm below ground level. In that case the building has masonry or concrete apron, about 12 m diameter holes at 300 mm centre to centre should be drilled close to the plinth wall along the apron. The holes should be deep sufficient to reach the soil below. Chemical emulsion should thereafter be pumped within these holes at the rate of 2.5 litres per linear metre of the length of the apron.