How far should the top of an extension ladder extend above the point where it rests on the building?

The guideline for how far the top of an extension ladder should extend above the point where it rests on the building is established to ensure safety and stability when accessing elevated areas. The correct extension is 36 inches, which provides adequate support and prevents the ladder from slipping or tipping over when a person is working at height.

An extension of 36 inches above the edge of the roof or working surface creates a secure handhold, allowing the user to maintain a firm grip while stepping onto or off of the ladder. This measure helps to reduce the risk of falls during entry and exit, which is crucial for ensuring safety when working on ladders.

While other extension distances, such as 30 inches, 24 inches, or 48 inches, may seem feasible, they do not provide the same level of security. Shorter extensions could make it difficult to maintain balance, and an extension longer than 36 inches might create unnecessary stability issues or complications when maneuvering.