Poisoning of soil under concrete surface beds and foundations is always a recommendation, especially in areas with known termite infestation. Rates vary according to the type of poison used, type of pest involved, size of project, and varying soaking depths.
Treatment must be effected once the footings are built and the filling has been consolidated, prior to the laying of conduits. It is also recommended that a plastic sheet with no puncture holes be laid over the treatment (Gundle USB green black). This would also eliminate rising damp if correctly applied.
There are also insecticides available for use on all timber which comes in contact with the building surfaces, i.e., window frames and doors. The product is painted on with a paint brush and usually three coats are ample to impregnate the wood.
Soil treatments are used to combat termite nests encountered in the surrounds to a building. The aim is to introduce approximately 40 litres of the mixture into the nest which would gas the queen, and the nest will die