How should the length of the overhang be determined for scaffolding planks longer than 10ft?

Determining the appropriate length of overhang for scaffolding planks is essential for safety and stability. The right choice indicates that there should be a maximum overhang of 18 inches for planks longer than 10 feet. This guideline is based on structural engineering principles, ensuring that the load distribution is safe and effective, while avoiding excessive cantilevering that could lead to instability or tipping.

When an overhang exceeds the specified maximum, it can create leverage that may increase the risk of the scaffold collapsing under load. Conversely, if the overhang is too short, it may not provide sufficient support for users or materials positioned on the far end of the plank.

The other options suggest various minimum and maximum lengths that might not align with safety standards or best practices established in the scaffolding industry. Adhering to the maximum overhang of 18 inches allows for a balance between accessibility and safety when using longer scaffolding planks.