Wood Destroying Organism (WDO) Home Inspection Practice Exam

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What is the ideal height for drilling holes in relation to the exterior foundation?

  1. Water table

  2. Exterior grade level

  3. Footing

  4. Foundation

The correct answer is: Exterior grade level

The ideal height for drilling holes in relation to the exterior foundation is ideally at the exterior grade level. This is significant because drilling at this height allows inspectors to effectively assess any potential wood-destroying organisms and moisture issues that may exist near the base of the foundation. Drilling at the exterior grade level ensures that the assessment occurs at the point where wood structures may be most vulnerable to external pressures, including excess moisture and pest intrusion. It is also important for ensuring that the drilled holes align with areas where wood structures, such as siding or wooden decks, intersect with the foundation, making it easier to identify any infestation or damage that may be occurring at or just above the foundation level. Being mindful of the relationship between the grade level and the foundation helps prevent overlooking critical areas that could lead to deterioration or serious structural issues over time. Thus, placing measurement and maintenance efforts in line with the exterior grade level is crucial for effective inspections related to wood-destroying organisms.

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