What is the minimum number of anchor bolts required for anchoring a 12-foot section of wood sill plate to a foundation?

In the context of anchoring a wood sill plate to a foundation, building codes typically specify requirements to ensure structural integrity and safety. For a 12-foot section of wood sill plate, the minimum requirement is usually two anchor bolts for the first 12 feet. However, additional regulations may support the necessity for more bolts to enhance overall connections and mitigate lateral movement during high winds or seismic activity.

In many building codes, one anchor bolt is required for every four feet of the sill plate. Therefore, when considering the full 12-foot section, you would need at least three anchor bolts to conform to the code and achieve a stable, secure connection. This requirement aims to effectively distribute loads and reinforce the sill plate's attachment to the foundation, ensuring that it can resist forces that might otherwise cause it to shift or collapse.

While two anchor bolts are sufficient for a smaller span or under specific circumstances, having three provides an extra layer of security that is generally recommended for wider spans like 12 feet. As you assess the options provided, the answer of three bolts is aligned with best practices in construction and in compliance with many local building standards.