Which barrier is established around the base of foundations to prevent termite intrusion?

• A. Vertical barrier
• B. Horizontal barrier
• C. Crack-and-crevice barrier
• D. Moisture barrier

Answer: (A)

A continuous vertical barrier around the foundation perimeter blocks subterranean termites as they move from the soil into the wall. This barrier creates a continuous shield on the vertical plane of the footing and stem wall, intercepting termites before they can breach the interior. It’s installed to address the primary access path at the base of the structure, which is the vertical route termites use to climb from soil into the foundation. Horizontal barriers, crack-and-crevice barriers, and moisture barriers serve different purposes: horizontal barriers stop movement under slabs, crack-and-crevice barriers target gaps in the concrete itself, and moisture barriers focus on reducing conditions that attract termites rather than physically blocking entry.