How deep must trenching and rodding treatments extend?

The correct response highlights that trenching and rodding treatments must extend 4 feet deep or to the top of the footer. This depth is critical for effective termite control as it allows the treatment to reach areas where termites are likely to be active, specifically their colonies, which are often found below the footing of a structure.

By reaching this depth, the treatment can create a more reliable barrier against subterranean termites, preventing them from accessing the structure above. The specification to reach the top of the footer is important as the footer is a primary structural element that can harbor termite activity. Not reaching this depth could leave a gap in the protective measures and potentially allow termites to bypass the treatment.

Other options suggest depths that do not align with established industry standards, which emphasize the necessity of thorough treatment to ensure a comprehensive barrier against termite ingress. Thus, understanding the required depth is essential for anyone involved in pest management to effectively protect structures from termite infestations.