Collapse zone

A collapse zone affects firefighters working on the exterior of a structure.

It collapses like a curtain dropping from the top, creating a pile of debris at the base of the wall.

The collapse zone itself should be as wide as the structure and as tall, plus half the height.

The reason for this increase in height is that the worst-case scenario (and the most common), a 90° Angle Collapse, must be assumed.

A collapse zone can easily limit the access of hose lines.