Wood Destroying Organism (WDO) Home Inspection Practice Exam

Which type of foundation is most resistant to termite penetration when properly constructed?

1. Poured concrete foundation

2. Wooden piers

3. Block foundation

4. Stone foundation

The correct answer is: Poured concrete foundation

Poured concrete foundations are known for their strong resistance to termite penetration when constructed properly. This durability arises because concrete is a dense material that does not provide suitable nesting conditions for termites, which thrive in wood and softer materials where they can easily create tunnels and colonies. When a poured concrete foundation is installed, it is typically continuous and seamless, minimizing potential entry points for termites. Additionally, the smooth surface of concrete does not offer the same grounding or organic material that pests prefer, making it challenging for them to establish colonies. Effective measures can also be taken during the design and construction phases, such as ensuring proper drainage away from the foundation, maintaining a barrier of at least six inches between wood and soil, and using termite-resistant treatments, which further enhances its resistance. In contrast, the other foundation types hold vulnerabilities. Wooden piers are made of organic material, making them highly attractive to termites. Block foundations, depending on the installation and gaps left during construction, can present openings for termite entry. Stone foundations, while somewhat durable, often have mortar joints that may allow for easier penetration and create suitable habitats for termites. Therefore, a well-constructed poured concrete foundation stands out as the most resilient choice against termite threats.