We treat the sides and bottom surface of the foundation trenches and pits with chemical to a height of about 30cm at the rate of 5 Lit. per square meter of surface area for optimum termite control.
Backfill earth on each side of all built up walls, which will be in immediate contact with the foundation, should be treated with chemical at the rate of 7.5Lit. per linear meter of vertical surface of the substructure, to a depth of 45cm and width of 15cm. The chemical shall be directed towards the masonry surfaces so that earth in contact with these surfaces is well treated with the chemical.
Before laying the floor, treat the top surface of the consolidated earth within the plinth walls with chemical at the rate of 5lit. per square meter.

Condition of Formation:-
The treated soil barrier shall be complete and continuous under the whole of the structure to be protected.  All foundations shall be fully surrounded by and in close contact with the barrier of treated soil.  Each part of the area treated shall receive the specified dosage of chemical required for effective pest control.

Time of Application:
The soil treatment shall start when the foundation trenches and pits are ready to receive mass concrete in foundations; laying of mass concrete shall start when the chemical emulsion has been absorbed by the soil and the surface is quite dry.  Treatment shall not be carried out when it is raining or soil is wet with rain or sub-soil water.  The foregoing earth surface within the plinth before laying the sub-grade for the floor.