North Carolina Building Contractor License Practice Exam

Metal reinforcement in concrete should typically be placed a minimum of how many inches?

1. 1/4 inch

2. 3/4 inch

3. 1 inch

4. 2 inches

The correct answer is: 3/4 inch

In concrete construction, the placement of metal reinforcement, such as rebar or wire mesh, is essential for improving the tensile strength and overall structural integrity of the concrete. The standard guideline for the cover to ensure proper bonding and to protect the reinforcement from environmental factors is typically set at a minimum distance of 3/4 inch. This distance helps to prevent corrosion of the metal and ensures that the concrete can adequately support the loads it is designed to handle. Additionally, the cover allows for effective performance of the concrete’s intended service life and maintains fire resistance and durability. Using a cover that is too shallow can expose the reinforcing material to moisture and chemicals, leading to corrosion and failure over time. Therefore, adhering to the minimum requirement of 3/4 inch is crucial for maintaining the longevity and stability of the concrete structure.