What is the recommended angle for non-self-supporting ladders?

The recommended angle for non-self-supporting ladders is one-quarter of the working length. This means that for every four feet of ladder height, the base of the ladder should be positioned one foot from the wall or support structure. This specific angle ensures stability and safety while using the ladder, reducing the risk of slipping or toppling over during use.

When the ladder is set at this angle, it provides a suitable balance between maintainability and vertical reach. A steeper angle could compromise stability, increasing the risk of accidents, while a shallower angle might make it difficult to climb or lead to potential slips, as the ladder would not be properly braced against the support. Therefore, setting the non-self-supporting ladder at a one-quarter angle helps ensure proper safety and functionality when performing work at heights.