National Home Inspector Practice Exam

What type of insect exit holes indicate possible powder post beetle infestation?

1. Approximately 1/8 inch in diameter

2. Approximately 1/16 inch in diameter

3. 1/4 inch or larger

4. No visible holes

The correct answer is: Approximately 1/16 inch in diameter

The presence of exit holes that are approximately 1/16 inch in diameter is indicative of a powder post beetle infestation. Powder post beetles are known for creating very small exit holes as they emerge from infested wood. These exit holes are a result of the adult beetles tunneling through wood materials, such as hardwoods, and are a telltale sign for inspectors to look for when assessing potential infestations. Unlike larger exit holes associated with other types of wood-boring insects, the specific size of 1/16 inch suggests that the exit holes are indeed made by powder post beetles. This precise measurement is critical in distinguishing between different wood-destroying organisms. Detecting these tiny holes can help in taking the necessary actions to evaluate and potentially treat the affected wood structures, making it an important consideration for inspectors assessing the integrity of wooden elements in buildings. The other sizes mentioned do not correspond to the powder post beetle. Holes that are approximately 1/8 inch in diameter are generally associated with other types of beetles, while holes of 1/4 inch or larger could relate to more significant pests such as carpenter bees. The absence of visible holes would also suggest that no active infestation is present, which further