How far should a ladder extend beyond the supporting edge when climbing?

The correct distance for a ladder to extend beyond the supporting edge when climbing is three feet. This guideline is important for ensuring safety while using a ladder. Extending the ladder by this amount provides adequate support and creates a stable base for the user. It helps prevent the ladder from slipping or shifting when weight is applied, reducing the risk of falls, which are a common hazard when working at heights.

For other options, while two feet might seem reasonable, it may not provide sufficient reach or stability for those working at higher levels. Likewise, extending five feet or eight feet could potentially exceed the necessary length, which might lead to awkward positioning and increased risk during ascent or descent. Thus, extending the ladder three feet beyond the edge ensures both safety and usability for climbing tasks.