California Residential Inspector Practice Exam

What is the minimum required vertical reinforcement for an 8-inch thick concrete basement wall 9 feet high?

1. #4 at 24 inches on center

2. #6 at 30 inches on center

3. #6 at 35 inches on center

4. #8 at 36 inches on center

The correct answer is: #6 at 35 inches on center

The minimum required vertical reinforcement for an 8-inch thick concrete basement wall that is 9 feet high is associated with building codes and structural engineering guidelines which outline the necessary support to ensure the integrity and safety of the structure. In the case of an 8-inch thick wall, the guidelines typically specify a particular type and spacing of rebar to resist lateral forces and provide adequate tensile strength. For a wall of this thickness and height, the minimum specification often called for is a #6 rebar at specified intervals. The choice indicating #6 at 35 inches on center aligns with those requirements, as it provides sufficient reinforcement to handle the loads that a basement wall is subject to, including soil pressure and hydrostatic pressure from groundwater. Choosing #6 rebar ensures that the wall maintains the necessary structural integrity, while the 35-inch spacing ensures that the reinforcement is close enough to provide adequate support without adding excessive material or weight to the wall. This balance between material usage and structural integrity is a critical consideration in structural design, and the chosen spacing reflects a common practice in the industry. Understanding these requirements is vital for ensuring that a basement wall can perform effectively under load, resist cracking, and maintain durability over time. Such considerations are essential knowledge for anyone involved in