A spreader is used to:

A spreader is primarily used to support walls that are collapsing inward. This function is crucial in construction and emergency situations where structural integrity is compromised. When a wall shows signs of undue stress or movement, a spreader can help brace it, preventing further collapse and protecting workers in the vicinity. The design of a spreader allows it to exert pressure outward, thereby stabilizing the wall and maintaining safety during repairs or adjustments.

In contrast, supporting structures under construction typically involves shoring or bracing systems that provide vertical support rather than lateral stabilization like a spreader. Distributing the weight of a roof is generally managed with beams and trusses designed for load distribution, rather than a spreader, which is specific to addressing inward pressure on walls. Holding up ceiling fixtures usually requires different hanging mechanisms or supports, which are also not the intended use of a spreader.

Given this context, the role of a spreader is vital in enhancing safety by managing the risks of structural collapse in specific scenarios.