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Security through environmental design

A perimeter security system is the first line of defence in any integrated security solution. Although technologies such as CCTV and detection systems assist in creating a more secure perimeter, the fence line remains the most important barrier that protects against unwarranted and unauthorised entry.

The traditional approach to fencing in the perimeter security industry is based on the concept of the 4Ds: the function of the fence line is to Demarcate, Detect, Deter and Delay. While these four concepts are as relevant today as they were twenty years ago, the way in which they are applied has changed considerably.

For the past ten to fifteen years, one of the major trends in perimeter security has been the move away from traditional fencing types such as steel palisade, concrete palisade and bar fencing in favour of various wire mesh fences that offer greater visibility.

This shift in the market has been primarily brought about by two changes within the industry. The first change has been the effect of the ‘security through environmental design’ philosophy. This means that greater attention is given to the aesthetics of a fencing system, and the ways in which it can affect environmental design. Unlike traditional fences that are often considered eyesores, fences with greater visibility can contribute to the overall appearance of an area.

The second change has been the understanding that security must be thought of as an integrated solution where the different security elements complement one another. In this context the greatest benefit of a fence with greater visibility is that it enables CCTV cameras, guard patrols and security lighting to more effectively identify breach attempts.

When high-density wire mesh fences were first launched they were characterised by the flat panel system that required a considerable amount of fencing structure (such as angle iron rails and cover strips) to secure, owing to a lack of rigidity in the panels. This problem was solved with the introduction of strengthening ribs, or V-bends, into the panels. These strengthening elements however had a negative impact on the security level of the fence as they were seen as hand and foot holds.

In an effort to bridge this gap a lot of research and development is going into creating highly rigid flat panel systems that combine the security features associated with flat panel fences with the aesthetics and cost effectiveness of a bent panel system.

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