What is the minimum vertical reinforcement spacing for a reinforced concrete foundation wall that is 7 feet high and 10 inches thick?

The correct answer is based on guidelines from the American Concrete Institute (ACI) and typical design practices for reinforced concrete walls. For a reinforced concrete foundation wall that is 7 feet high and 10 inches thick, the vertical reinforcement spacing is typically governed by factors such as the height, the thickness of the wall, and the type of loads that the wall will encounter.

In this case, spacing of vertical reinforcement bars (rebar) is essential in ensuring that the wall has adequate strength to resist both bending and shear forces, particularly in taller walls or those subject to lateral earth pressures. According to ACI guidelines, the maximum spacing for vertical reinforcement in walls is generally limited to a certain height-to-spacing ratio for effective load distribution and ductility.

For a wall of this height, the spacing of 56 inches on center is recommended. This distance ensures that there are enough vertical bars to maintain structural integrity, especially under load. The 56-inch spacing accommodates the structural demands without compromising safety or performance.

Hence, the choice of 56 inches on center aligns with generally accepted engineering practices for vertical reinforcement in foundation walls of this configuration.