Chain-Link Fences. Chain-link fencing is the type of structural
barrier most commonly used to enclose restricted areas where fencing is
required. Fabricate new and replacement fencing enclosing designated
restricted areas, exterior to structures, with chain-link components. While
chain-link fences are expensive, they require very little maintenance and
provide little concealment for intruders. In evaluating the requirements for
a perimeter fence, the security planner should remember that many perimeter
barriers provide less than 10 seconds of delay time. The construction of a
chain-link fence will not only define the protected area and cause an intruder
to make an overt action that will demonstrate his intent, but will also
provide a structure for installing IDS fence sensors to detect intruders.
Another advantage of fence systems is that they provide some explosives and
ballistics standoff protection for making the perpetrator breech the fence
line to reduce the distance to his target.
Federal Specification RR-F-191 is the primary criteria document
for security fence components; however, do not specify aluminum fabric, poles,
or accessories for security fence components. Definitions for fence components
are provided in American Society for Testing Materials (ASTM) F 552,
Definitions of Terms Relating to Chain-Link Fencing, and in the glossary of
Take particular attention in areas with harsh environments to
determine if Type IV chain-link fabric (which provides a plastic coating over
zinc-coated steel) material is desirable. ASTM A 90, Standard Test Method for
Weight of Coating on Zinc-Coated Galvanized Iron or Steel Articles, or ASTM A
428, Standard Test Method for Weight of Coating on Aluminum-Coated Iron or
Steel Articles may be used to assure adequate protection for chain-link fence
components. Use ASTM standards where supplemental criteria is either required
Posts and Bracing. Ensure all posts for security fencing meet the
requirements of Federal Specification RR-F-191/3 for one of the following
Class 1 - Steel pipe.
Class 3 - Formed steel sections.
Class 4 - Steel H-sections.
Class 6 - Steel square sections.
Accomplish bracing with steel truss rods not less than 5/16-inch
(7.9-millimeters (mm)) nominal diameter and a turnbuckle for tensioning,
conforming to RR-F-191/4.
Use the following ASTM Standards to supplement RR-F-191/3 and RR-