Walls that provide structural support are known as:

Load-bearing walls are crucial components of a building's structure, as they are designed to support the weight of the roof, floors, and any additional loads above them. These walls play a vital role in maintaining the integrity and stability of a structure. When designing and constructing buildings, load-bearing walls must be carefully considered to ensure they can withstand the forces acting upon them, such as gravity and environmental factors.

In contrast, nonbearing walls do not support any structure above them; they are often used for interior partitions and can be removed or modified without compromising the overall stability of the building. Pillar walls and truss walls are not standard terms in structural engineering; pillar refers to a vertical support system that may not necessarily constitute a wall, while truss systems are used to distribute loads across a framework but are not defined by wall assembly. Understanding the roles of these different types of walls is essential for firefighters to recognize structural integrity during emergency situations and make informed decisions about safety and strategy.