What is the rule of thumb regarding ladder length when placed on a roof?

The guideline suggesting that a ladder should have at least five rungs above the roof line is designed for safety and stability when accessing a roof. This rule helps ensure that the firefighter or individual using the ladder has sufficient handhold and support when transitioning from the ladder to the roof. When positioned this way, the higher rungs provide a secure grip, reducing the risk of slipping or losing balance during the critical movement from the ladder to a potentially wet or unstable roof surface.

Having an adequate number of rungs above the roof is essential to prevent accidents and to give the user confidence while maneuvering at heights. The "five rungs above" standard is based on practical experience in the field, indicating that this height allows for better operational control and reduces the likelihood of safety mishaps.