When external slabs prevent trenching, how far apart can rod holes be placed?

In situations where external slabs inhibit the ability to trench around a structure for termite control, the correct distance for placing rod holes is 12 inches apart. This spacing is recommended to ensure that the treatment is effectively distributed throughout the affected area, allowing adequate coverage for preventing termite entry and establishing a barrier.

Using this distance allows pest control applicators to maximize the effectiveness of the termiticide being injected. Close spacing without trenching ensures that the chemical reaches potential entry points where termites could otherwise access the structure. As a result, this method helps to maintain the integrity of the treatment even in challenging situations with structural limitations.

Other options suggest either greater or lesser distances, which may not provide sufficient coverage or could lead to areas being left unprotected. Ensuring the rod holes are placed at the correct intervals is critical for the overall success of the termite treatment plan.