Distance from a structural expansion connector to the adjacent side where a support shall be located?

• A. 1 ft
• B. 2 ft
• C. 3 ft
• D. 4 ft

Answer: (B)

Expansion joints in concrete slabs are designed to allow movement without transferring stress into nearby structures. When placing a support near such a joint, you need a buffer so the joint’s movement doesn’t act on the mount or its anchors. Two feet from the expansion joint to the adjacent side where a support will be located provides that practical clearance, helping to prevent cracking, misalignment, or loading of the mounting hardware as the slab expands or contracts. A smaller distance risks transferring movement to the support, while a larger distance isn’t needed for this requirement.