When a ladder is used to access a roof, at least how many rungs should show above the roofline?

When a ladder is used to access a roof, it is essential for safety that at least five rungs show above the roofline. This practice provides several benefits that enhance safety and stability. Having sufficient rungs above the edge ensures that firefighters have a secure handhold when stepping onto or off the roof, which significantly reduces the risk of slipping or losing balance.

Additionally, it helps to ensure that the ladder is firmly placed and can accommodate the movement of personnel, thereby minimizing accidents during emergency operations. If there are not enough rungs above the roofline, the ladder may not be stable enough, and personnel could face difficulties in maintaining their footing or transitioning safely onto the roof surface.

The importance of this guideline is emphasized in training to ensure that firefighters can effectively navigate challenging environments such as roofs during emergencies.