Anchor rods vary in length from 3 1/2 feet to ?.

• A. 6'
• B. 8'
• C. 10'
• D. 12'

Answer: (D)

Anchor rods are embedded into the concrete to develop the necessary strength, and they must extend deep enough to achieve that embedment while leaving enough length above ground for nuts, washers, and any connections. Because embedment depth varies with foundation design, rods are supplied in standard lengths that cover a wide range. Starting from a typical minimum of 3 1/2 feet, the common maximum length used is 12 feet, which accommodates deeper foundations and provides ample thread and adjustment length above ground. So 12 feet is the longest standard length, making it the best choice.