Conquer the Crawlies: 2026 WDO Home Inspection Practice Exam – Defend Your Domain!

The correct choice highlights a significant concern when using termiticides in basements: the presence of French drains. French drains are designed to redirect water away from the foundation of a building. When applying termiticides, it is crucial to consider the drainage systems in place, as these drains can carry chemicals away from the targeted area if not managed properly. If termiticides are inadvertently flushed away through the drainage system, it reduces their effectiveness and can lead to instances of untreated areas, increasing the risk of termite infestation.

The other materials mentioned, such as plywood floors, concrete walls, and steel beams, while they may have implications in terms of construction or support, do not directly interfere with the application and effectiveness of termiticides in the same way that drainage systems do. Plywood floors could be damaged by termites but do not pertain to the delivery or efficacy of the chemicals used. Concrete walls can actually serve as barriers to termites and may also be useful when applying treatments, while steel beams are durable and unlikely to contribute to termite issues. Therefore, the potential interference of French drains with treatment effectiveness makes it the most critical concern in this context.