Wood Destroying Organism (WDO) Home Inspection Practice Exam

Wooden steps should rest on a concrete base or apron that extends at least how many inches above grade?

1. A) 4

2. B) 6

3. C) 3

4. D) 5

The correct answer is: B) 6

The correct answer is based on the general building code requirements that aim to ensure the longevity and stability of wooden structures, particularly when they are exposed to moisture. When wooden steps are installed, it's critical that they rest on a solid foundation to avoid rot and deterioration over time. Having a concrete base or apron that extends at least 6 inches above grade serves several purposes. It provides adequate elevation to prevent moisture from splashing onto the wood, which can lead to decay and attract wood-destroying organisms such as termites and fungi. Furthermore, this elevation helps discourage soil erosion around the steps and can assist in draining water away from the wooden components. In many areas, building codes emphasize this standard to enhance safety and maintain building integrity. Six inches is a widely accepted standard that balances these concerns effectively, making it the preferred answer in home inspection practices related to wood-destroying organisms.