Holes drilled to treat concrete block foundation voids should be done at what height?

Drilling holes to treat concrete block foundation voids at a height close to the outside grade level is crucial for several reasons. This height allows for the most effective distribution of the treatment material into the voids or spaces between the concrete blocks. When holes are made at this level, it facilitates the flow of the treatment downwards, ensuring that it penetrates the areas where wood-destroying pests, such as termites, might be present.

By placing the holes at exterior grade level, the treatment can also reach any potential entry points that pests may exploit, maximizing the effectiveness of the treatment. This approach takes into account the natural behavior and movement patterns of wood-destroying pests, ensuring that the treatment is applied where it is most needed.

Holes drilled at other heights, such as above the top of the outside grade level, may not allow for proper penetration into the foundation voids, which can lead to an ineffective treatment process. Moreover, drilling at the bottom of the foundation or at the top of the inside slab is less ideal because it may not provide direct access to the void areas that pests inhabit or where they might enter the foundation. Thus, the chosen height reflects a strategic approach to pest management in concrete block foundations.