When must masonry walls over 8 feet be braced?

Masonry walls over 8 feet must be braced to prevent overturning and collapse. This is crucial because as the height of a wall increases, the forces acting on it also increase. These forces can lead to instability, making the wall susceptible to tipping over, especially in adverse weather conditions like high winds. Proper bracing techniques ensure that the wall can withstand lateral forces, maintaining its structural integrity and safety.

While other considerations such as preventing falling debris, aesthetic purposes, and compliance with fire regulations may also be relevant in the broader context of construction and safety, they do not directly address the mechanical stability of tall masonry walls. The primary concern with masonry walls of this height is ensuring that they remain upright and secure under various conditions, thus making the focus on prevention of overturning and collapse paramount.