What is the appropriate slant ratio when setting up an extension ladder?

The appropriate slant ratio when setting up an extension ladder is considered to be 1:4. This means that for every four feet of ladder height, the base of the ladder should be positioned one foot away from the wall or vertical surface it is leaning against. This ratio provides optimal stability and support, minimizing the risk of the ladder slipping or tipping over while in use.

Setting the ladder at this angle helps to ensure that it is secure and that the climber can ascend or descend safely. A steeper angle (like the 1:3 ratio) can increase the risk of the ladder sliding out. Conversely, a flatter angle (like 1:5) may lead to instability as well, potentially causing the ladder to fall backwards. Therefore, understanding and applying the 1:4 slant ratio is crucial for safety in ladder use.