Question 35
Domain 1: Footings, Foundations, and CrawlspacesWhat is the purpose of anchor bolts in residential foundation construction?
Correct answer: B
Explanation
Anchor bolts fasten the wood sill plate to the concrete foundation, creating a secure connection between the framing and the base. This connection helps the structure resist "lateral and uplift forces" from wind, seismic movement, and other loads that could shift or lift the house.
Why each option is right or wrong
A. To reinforce the concrete against cracking
B. To connect the wood sill plate to the foundation and resist lateral and uplift forces
Under IRC R403.1.6, foundation anchorage is required to secure the wood sill plate to the concrete or masonry foundation, typically with 1/2-inch-diameter anchor bolts embedded at least 7 inches into concrete and spaced not more than 6 feet on center. The code’s purpose is to keep the superstructure tied to the foundation so it can resist horizontal shear and uplift from wind or seismic loading, rather than merely resting on the footing.
C. To provide drainage channels through the foundation wall
D. To support the rebar within the footing