National Home Inspector Practice Exam

How can a drainage tile be best recognized?

1. A) Curved clay-tile assembly installed along a dormer's headwall

2. B) Pipe set in gravel running continuously along a building's foundation footings

3. C) Ceramic-tile washboard installed at a laundry sink

4. D) Concrete splash-block below a flat roof drain system

The correct answer is: B) Pipe set in gravel running continuously along a building's foundation footings

A drainage tile is most effectively recognized by its configuration and installation method related to water management around a foundation. The correct choice describes a pipe that is set in gravel and runs continuously along a building's foundation footings. This arrangement is characteristic of drainage tiles designed to channel excess water away from the foundation, preventing water accumulation that could lead to structural issues. The use of gravel is significant because it allows for effective water flow while preventing soil from entering the drainage system, which could clog it. The continuous alignment along the foundation footings ensures that the drainage system captures runoff and groundwater, directing it away from the building. In contrast, other options do not represent drainage tiles effectively. The curved clay-tile assembly along a dormer's headwall describes a roofing or siding detail rather than a foundation drainage system. The ceramic-tile washboard at a laundry sink is an item used for washing clothes and has no relation to drainage systems. Lastly, a concrete splash-block below a flat roof drain system is designed to redirect water from a roof surface, which is different from the purpose of drainage tiles that are primarily concerned with subsurface water management around foundations.