What is the function of the bands when it is placed on overhang?

When bands are placed on an overhang (in architectural or construction contexts), their primary function is to provide structural support and stability to the overhanging elements. These bands can be part of the reinforcement system that helps in distributing loads and stresses evenly, preventing the overhang from sagging, cracking, or collapsing under its own weight or under additional loads such as snow, wind, or the weight of people (in the case of overhanging balconies or similar structures).

Additionally, bands can also serve aesthetic purposes, contributing to the visual appeal of the structure by adding decorative elements or hiding joints and support mechanisms to create a seamless appearance. In some cases, they may also provide a surface for the attachment of other elements, such as gutters or downspouts, or serve to protect the edge of the overhang from weathering and wear.