Which material is NOT commonly used in construction walls and fences?

Plastic is not commonly used as a primary material for constructing walls and fences in comparison to the other options. While plastic can be utilized in certain applications, such as for decorative or lightweight fencing, it lacks the structural integrity and durability typically required for foundational wall and fencing construction. On the other hand, wrought iron, brick, and concrete are traditional and well-established materials that provide strength, stability, and longevity in construction.

Wrought iron is recognized for its strength and is often used in fencing due to its ability to create secure and ornate designs. Brick is a classic building material known for its durability and insulation properties, making it a preferred choice for walls. Concrete is frequently chosen for its versatility, strength, and ability to withstand various weather conditions, making it a standard in both walls and fences.

Thus, the distinction lies in the conventional application and structural capacity of these materials, with plastic being less typical for significant wall and fence construction.