Michigan Residential Builders License Practice Test

What is the minimum overlapped length for splices in rebar?

1. 6 inches

2. 12 inches

3. 18 inches

4. 24 inches

The correct answer is: 12 inches

The minimum overlapped length for splices in rebar is determined by various factors including the type of concrete, the diameter of the rebar, and the specific requirements set by building codes. In most specifications, an overlap of 12 inches is often required to ensure a strong connection between two lengths of rebar. This overlap is crucial because it allows for the adequate transfer of load and tensile strength, which are essential for the structural integrity of reinforced concrete. The 12-inch splice ensures that the stress is evenly distributed across the spliced sections, thereby minimizing the risk of failure at the joint. In practice, this requirement helps to prevent areas of weakness that could compromise the structural performance of a building or slab. Therefore, the 12-inch overlap is typically referenced in codes like the American Concrete Institute (ACI) standards.