Massachusetts Construction Supervisor License (CSL) Practice Test

In a two family dwelling, what is the minimum required height above the floor that a nonabsorbent wall surface must extend in a shower compartment?

1. 6 feet

2. 8 feet

3. 10 feet

4. 7 feet

The correct answer is: 6 feet

The minimum required height for a nonabsorbent wall surface in a shower compartment in a two-family dwelling is 6 feet above the finished floor. This requirement is established to ensure that the area likely to be exposed to water is adequately protected from moisture damage. Nonabsorbent materials, such as tiles or certain types of plastic, help prevent water from penetrating the walls and causing issues like mold, mildew, or structural damage over time. In the context of building codes and standards, maintaining a consistent height for these surfaces is essential for safety and hygiene. A height of 6 feet is considered appropriate as it generally covers the area where water splashes or accumulates during typical shower use. As such, while other heights, like 7, 8, or 10 feet, may provide additional coverage, the code specifically stipulates 6 feet as the necessary minimum to mitigate the risks associated with moisture exposure.