RR-F-191/4F
3.4.5 Items 5 and 6, brace and tension bands. Brace bands shall be used to secure top rail and brace ends to terminal posts. When tension bars are used, tension bands shall be used for securing chain-link fabric at each terminal post (see 3.4.6). Spacing of tension bands on posts shall be at 15-inch intervals or less. Brace and tension bands shall be steel and shall be 3/4-inch wide by 1/10-inch thick nominal.
3.4.6 Item 7, tension bars. Tension bars for 1-3/4 and 2-inch mesh shall be no less than 3/16 by 3/4-inch or equivalent cross-sectional area. Tension bars for 1-inch mesh shall be no less than 3/8 by 3/16-inch or equivalent cross-sectional area. A tension bar
shall be provided where chain-link fabric meets terminal posts. Tension bar shall be steel, of a continuous length compatible with the height of the fence and shall be threaded
through the fabric and attached to the post by tension bands (see 3.4.5). Roll formed posts with integral loops for weaving fabric to posts are acceptable in lieu of tension bars.
3.4.7 Item 8, tension wire. Tension wire shall be furnished when top rail is not required. Tension wire shall be used at the bottom of the fence when fabric is not otherwise secured. Tension wire shall be zinc coated steel, aluminum coated steel in accordance with ASTM A824 or polyvinyl chloride (PVC) over zinc-coated steel, or aluminum
alloy in accordance with ASTM F1664 as specified (see 6.1). Unless otherwise specified (see
6.1), all tension wire shall be manufactured with 7 gage steel wire size.
3.4.7.1 Steel tension wire. Steel tension wire shall be marcelled or crimped coil spring hard tempered carbon steel wire. The tension wire shall have a minimum tensile strength of 75,000 pounds per square inch. Zinc coated steel shall not have less than 1.2 ounces of zinc per square foot of coated surface area unless otherwise specified (see 6.1). Zinc - 5% aluminum-mischmetal (Zn-5Al-MM) coated steel shall not have less than 0.60 ounces per square foot unless otherwise specified (see 6.1). Aluminum coated steel shall not have less than 0.40 ounces of aluminum per square foot of coated surface area. Unless otherwise specified (see 6.1), PVC coated wire shall have minimum coating thickness of 0.007-inches. The coatings shall match the fence fabric.
3.4.7.2 Aluminum alloy tension wire. Aluminum alloy tension wire shall conform to the chemical composition of ASTM B211, Alloy 6061-T94.
3.4.8 Item 9, truss rods. Truss rods shall be steel and have a minimum diameter of
5/16-inch.
3.4.9 Item 10, barbed wire. Unless otherwise specified, barbed wire shall consist of two
12-1/2-gage 0.099-inch twisted line wires with 14-gage 0.080-inch round barbs as listed in ASTM A121, Design Number 12-4-5-14R. Barbed wire shall be zinc-coated steel, Zn-5Al-MM coated steel, aluminum coated steel, or PVC over zinc-coated steel per ASTM F1665 as specified (see 6.1). All barbs shall consist of four points and spacing of barbs shall be at
5-inch (+1-inch) centers.
3.4.9.1 Zinc-coated steel barbed wire. Zinc-coated steel barbed wire shall have a zinc coating of at least 0.80 ounces per square foot of coated surface area (see 4.4.2.1).
3.4.9.2 Aluminum-coated steel barbed wire. Aluminum-coated steel barbed wire shall have an aluminum coating of at least 0.30 ounces per square foot of coated surface area (see 4.4.2.1). Solid aluminum barbs are acceptable.
3.4.9.3 PVC coated steel barbed wire. PVC coated steel barbed wire shall have a PVC coating of at least 0.007-inch thickness. Wire shall be coated with a minimum of 0.3 ounces of zinc per square foot of coated surface area or meet the requirements of 3.4.9.2 before application of the PVC coating.
3.4.9.4 Aluminum alloy barbed wire. Aluminum alloy barbed wire shall conform to the chemical composition of ASTM B211, Alloy 6061-T94.
3.4.9.5 Zn-5AL-MM coated steel barbed wire. Zn-5Al-MM coated steel barbed wire shall have a coating weight of at least 0.40 ounces per square foot of coated surface area (see
4.4.2.1).
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