What is the maximum specified cover for bundle bars in concrete?

• A. 2 inches
• B. 1 inch
• C. 3 inches
• D. 4 inches

Answer: (A)

Two inches is the maximum specified cover because the outer surface of the bundle needs to stay close to the concrete surface to provide adequate protection while still leaving enough concrete around the bundle for proper bonding and transfer of stresses. If you specify more cover, you waste material, can complicate formwork and placement, and doesn’t improve durability. A one-inch cover is typically too small to protect the bars from moisture and corrosion, while three or four inches adds unnecessary concrete without added benefit. So, two inches is the practical limit that balances protection, constructability, and bond behavior.