What is the appropriate depth of untreated soil to cover after making a termiticide application along the exterior foundation?

The appropriate depth of untreated soil to cover after making a termiticide application along the exterior foundation is 1/2 inch. This depth is ideal because it allows the termiticide to effectively penetrate the soil, enhancing its efficacy while also ensuring that it remains within a concentrated zone where termites are likely to encounter it. A 1/2 inch cover is optimal for balancing both the protection of the termiticide and preventing excessive exposure to sunlight, which can degrade the chemical and reduce its effectiveness against wood-destroying insects.

Covering with too little soil, such as 1/4 inch, may leave the termiticide exposed and diminish its protective qualities. Conversely, using too much soil, like 3/4 inch or 1 inch, could dilute the concentration of the termiticide, reducing its ability to target pests effectively near the foundation, where termites are more likely to travel. Therefore, a 1/2 inch cover is the most appropriate depth to ensure effective pest control.