When a ladder is used to gain access to a roof, a minimum of how many rungs should show above the roofline?

When utilizing a ladder to access a roof, it is essential for safety that a specific number of rungs is visible above the roofline. Having five rungs above the roofline ensures that there is a stable and secure point of contact for firefighters when they transition from the ladder to the roof. This height provides sufficient leverage to safely step onto the roof without the risk of losing grip or balance, facilitating a secure and safe exit from the ladder.

Additionally, five rungs above the roofline help to ensure that the ladder does not slip or move while personnel are climbing or descending, reducing the potential for accidents. This standard is widely acknowledged within firefighting protocols as a practice that enhances safety and efficiency when working at elevated heights.

The other options do not meet the optimal safety requirements and may increase the risk of accidents, as fewer rungs may not provide enough stability or support for a smooth transition onto the roof.