North Carolina Building Contractor License Practice Exam

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What is the maximum spacing allowed for joist bridging?

24 inches
36 inches
48 inches
60 inches

The correct answer is: 48 inches

Joist bridging is a crucial component in floor and roof framing, providing lateral support to joists and enhancing their stability under load. The maximum spacing allowed for joist bridging is 48 inches. This spacing ensures that the joists are adequately reinforced against lateral movement and prevents issues such as twisting or buckling, which can lead to structural problems over time. When joists are spaced too far apart without the necessary bridging, the risk of deflection and sagging increases, potentially compromising the integrity of the building. Maintaining the correct spacing between bridging members is essential for ensuring that the floor system performs effectively under live and dead loads. Other options exceed the maximum spacing recommendations set forth by building codes and best practices in construction, which specify that bridging should effectively support the joists to maintain a strong, stable structure. Therefore, the choice of 48 inches aligns with the regulatory requirements for safe building practices.