Chain Link Fabric Tensioning and Tie Wire Technique

Why this matters

A fence tensioned wrong doesn't fail on install day, it fails on the customer's next service call eighteen months out, needing a full re-stretch that a five-minute check at the time would have caught for free. Overstretched fabric permanently deforms the diamond mesh; once the wire has yielded past its shape, releasing the tension does not return it, and the only fix is re-hanging that section. Understretched fabric bellies the first time a kid leans on it or a dog tests the bottom rail, and the fence reads as a cheap job regardless of how square the posts came out. Getting tension right once and tying it off so it holds, rather than by feel on the come-along handle, is what separates a chain link job that looks the same in year five as it did on day one.

Anchor the pull correctly before touching the come-along

Insert a stretcher bar through the fabric a few feet ahead of the terminal post you're pulling toward, not at the terminal itself. Pulling directly against the terminal transmits load through only the diamonds closest to it; setting the stretcher bar back a few feet spreads the load across more of the weave before it reaches the terminal connection, which is what produces even tension rather than a tight strip near the post and slack behind it. Anchor the come-along to the fixed point that was built to take this load, the brace assembly at a terminal post that's already reached real concrete strength, never to a line post, which has no diagonal truss resisting the pull and will bow inward the moment real tension comes on. A come-along loaded against green concrete or an unbraced post doesn't stretch the fabric, it moves the post, and the whole run reads crooked from the terminal outward. Before applying load, confirm nobody stands in line with the pull; a fitting or a stretcher bar that lets go under tension releases stored energy back along that line, not sideways.

Judge tension by the diamond shape, not by feel

Correct tension is a geometric property of the mesh, not a felt resistance on the come-along handle, since two installers' sense of "tight enough" varies but the diamond shape doesn't. Sight down the fabric at working height: correctly tensioned mesh shows uniform diamond size and proportion across the full stretched span, post to post, not just near the stretcher bar. A practical field check that doesn't depend on a memorized number: with tension correct, you should not be able to pull the fabric away from the top rail by hand more than about the width of one diamond opening at any point between line posts. More give than that anywhere along the span means the pull hasn't reached that section yet, and it goes back on the come-along before any tying starts.

One test, two outcomes: overstretched and understretched both fail the same check

Overstretched shows diamonds pulled visibly narrower and taller than their normal proportion, sometimes with a faint whitening at the wire twists where the galvanizing has stressed. It happens when a crew keeps cranking past the point where resistance stopped increasing, on the theory that more pull means a better job. It doesn't. Past yield, the mesh has permanently deformed, the terminal post is being dragged out of plumb by a load it was never meant to carry standing alone, and backing the come-along off afterward does not recover the shape. The only fix is releasing that section and re-hanging fresh fabric.

Understretched shows a visible belly when you sight along the top rail, and the diamonds near the stretcher bar look correct while the ones mid-span look larger and looser. It happens when a crew ties off before the come-along has actually reached full travel, usually to save time, or when the anchor point itself was giving under load, a line post flexing instead of a braced terminal holding firm, so the pull never fully transmitted past the point where the anchor started absorbing it instead. The fix is not tying the far end and hoping the near end's tension carries through; run the diamond check at multiple points along the span, not just next to the stretcher bar, before any tie wire goes on.

Tie in the order that locks the tension in, not the order that's easiest to reach

Tie the fabric to the terminal hardware, the tension bar and its bands, first, while the come-along still holds full tension on the line. Only after that connection is locked down does the come-along move to the next section, and line posts get tied working from the tensioned end back toward the slack end. Tying line posts before the terminal connection is secured lets the dialed-in tension creep back out through that unlocked terminal joint, and a crew that worked line posts first can tie a whole run to a tension that was never actually final.

For the wrap itself: 1.5 to 2 full twists locks a tie wire without over-working it. More twists than that work-hardens the wire at the twist point, and a tie that's been wound past that point can snap clean at the twist under normal wind load, leaving a connection that still looks tied from a few feet away but carries no load at all. Point the twisted tail away from the traffic side and trim it short; follow the general installation reference's tie-interval spacing at line posts, top rail, and tension wire, since that spacing is what this technique assumes is already set.

Verify the tied section, not just the pre-tie pull

Re-run the diamond check along the tied span after tying, not only before, since uneven wrap tension while tying can pull the mesh slightly out of true even after a clean pre-tie stretch. Sight the tie tails for consistent length and direction along the run. Tug-test a sample of ties, not every one, to confirm none slip under hand pressure; a tie that spins loose on a light tug was undertwisted and needs redoing before the crew moves to the next section.

Worked example

A 60 foot chain link section, 11 gauge fabric, running between two braced terminal posts with fully cured footings. The stretcher bar goes in about 3 feet ahead of the far terminal, and the come-along anchors to what the crew believes is the near terminal's brace assembly.

The diamond check near the stretcher bar reads clean and uniform. Sighting along the top rail past the 40 foot mark, though, the mesh shows a visible belly, and the diamonds there sit noticeably looser than the ones closer to the pull. Checking the anchor point finds the problem: the come-along was actually hooked to the first line post past the terminal, not the terminal's own brace assembly, and that line post has flexed a couple of degrees under load, absorbing tension that should have reached the far end of the span.

The come-along is released, re-anchored to the terminal's brace assembly itself, and the pull is redone. This time the diamond check passes uniformly at the 20, 40, and 55 foot marks, with no more than one diamond-width of give anywhere along the span. Tying proceeds terminal hardware first, then line posts back toward the stretcher bar, at 1.5 to 2 twists per tie. The post-tie diamond check confirms the span held true after tying, and a tug test on six sample ties across the run confirms none slip.

References

• See related: Chain Link Fence Installation, for post and brace assembly and the tie-interval spacing this technique assumes is already set.
• See related: Chain Link Tension Loss vs Stretched vs Broken Decision Tree, for diagnosing an already-installed fence's sag after the fact, rather than getting tension right at install.
• ASTM F567, Standard Practice for Installation of Chain-Link Fence.
• ASTM A392, Standard Specification for Zinc-Coated Steel Chain-Link Fence Fabric, for wire gauge and yield behavior.