Expanded Mesh for Safety Barriers Expanded Mesh is a type of metal that has been cut and stretched to form a regular pattern (usually diamond-shaped) that distributes loads evenly over a large surface area due to the lack of welds or joints. Expanded Mesh is ideal for new or retrofit fencing for homeland security or commercial, industrial, government or institutional facilities where there is a high potential for malicious intrusion. We can also design site-specific expanded metal physical security perimeter highway guardrails or portable guardrails. Advantages of Expanded Mesh Strong and Durable Metal mesh is made by flattening the material into a solid piece of metal and then stretching it. Since it is not held together by welds or joints, it is stronger and able to withstand greater loads.