Which step is performed first in a coffin cut?

In a coffin cut, the first step is to perform a 3' cut from left to right of the firefighter. This initial horizontal cut is crucial because it establishes the starting point for the entire operation, allowing the firefighter to create a solid, identifiable opening in the roof, which is vital for effective ventilation. The 3' cut helps to ensure that the subsequent cuts can be accurately aligned and executed, facilitating a safer and more efficient procedure.

This choice emphasizes the importance of establishing a baseline cut that can guide further actions, such as making the perpendicular cuts and the diagonal corner cut that might follow. By initiating with this foundational cut, firefighters can ensure better control and precision as they proceed through the subsequent steps of the operation.