What is the lean ratio of an extension ladder?

The lean ratio of an extension ladder is indeed 4:1, which is essential for ensuring safe and effective use of the ladder. This means that for every four feet of height that the ladder reaches, the base should be one foot away from the wall or support it is leaning against. This ratio helps maintain stability and prevents the ladder from tipping backward, which is a common safety concern when using ladders.

Using the correct lean ratio allows a person to climb safely while minimizing the risk of falling. If the ladder is positioned too steeply or too flat, it can compromise the user's safety by increasing the chance of slippage or loss of balance. Therefore, adhering to the 4:1 ratio is crucial for safe ladder practices and reflects proper training in ladder safety protocols.