California Residential Inspector Practice Exam

What is the minimum nominal thickness of masonry bearing walls for a two-story dwelling?

1. 6 inches

2. 8 inches

3. 10 inches

4. 12 inches

The correct answer is: 8 inches

The minimum nominal thickness of masonry bearing walls for a two-story dwelling is indeed 8 inches. This requirement is based on building codes and structural standards that ensure adequate support for the vertical loads from the structure above, as well as lateral forces such as wind or seismic activity. Masonry materials, such as brick or concrete block, must be sufficiently thick to resist the forces acting on them while also providing the necessary capacity to support the weight of the structure, including any additional loads that may be imparted by occupancy or additional features on the dwelling. Choosing a wall thickness of 8 inches provides a balance between structural integrity and material efficiency, ensuring that the walls are strong enough without excessive use of materials, which could lead to increased costs or unnecessary weight. In the context of residential construction, this specification helps maintain safety standards while adhering to practical building practices.