Bearers should extend a minimum of ___ inches over the outside edges of runners.

• A. 2
• B. 3
• C. 4
• D. 6

Answer: (B)

On scaffolding, bearers are the horizontal members that support the planks the worker stands on, while runners run along the scaffold’s length. The plank needs to sit securely on these bearers and still have enough bearing area past the edge of the runner to prevent slipping.

Extending the plank a minimum of 3 inches over the outside edge of the runners ensures there’s adequate support on the bearer for the portion of the plank that workers rely on near the edge, helping keep the plank stable under load. If the overhang were smaller, the plank could seat poorly on the bearer or shift more easily; with a larger overhang, you risk more unsupported plank length and potential instability.

So, the minimum overhang of 3 inches provides a safe balance between secure seating on the bearer and maintaining a stable, supported working surface.