Construction Supervisor License Practice Exam

What is the minimum required height for a two family house foundation footings?

1. 18 inches

2. 24 inches

3. 30 inches

4. 36 inches

The correct answer is: 18 inches

The minimum required height for foundation footings of a two-family house is typically determined by local building codes and regulations, which are designed to ensure stability and support for the structure. In many areas, the acceptable standard for footing depth is 18 inches. This depth helps to prevent issues such as frost heave and ensures that the footings rest on stable soil. Footings need to be deep enough to support the weight of the structure and prevent shifting or settling over time. In colder climates particularly, the depth is considered sufficient to place the footings below the frost line, which is crucial for the prevention of frost-related damage. While deeper footings may be required in certain circumstances, such as for specific soil conditions or in areas with higher building loads, 18 inches generally serves as a baseline requirement for the foundation of a two-family dwelling. Therefore, this choice aligns with typical regulatory standards that construction supervisors must adhere to during the planning and execution of building projects.