Which is NOT a common material for a foundation wall?

The correct answer identifies steel as not being a common material for foundation walls. Typically, foundation walls are constructed from materials that can provide the necessary compressive strength and stability to support the structure above ground. Concrete is the most popular choice, as it is strong, durable, and capable of withstanding the loads and pressures from soil and water. Similarly, stone has been a traditional choice for foundations due to its natural strength and durability. Brick, while less common than concrete, can also be used in foundation walls and is accepted in certain applications as it can provide needed structural support.

Steel, on the other hand, is not generally used as a standalone material for foundation walls. While it may be utilized in structural elements such as beams or reinforcements within a concrete foundation, its application as a primary material for foundation walls is limited due to susceptibility to corrosion, high thermal expansion, and cost considerations. Therefore, in the context of common foundation wall materials, steel does not fit the usual practices.