Working Farm Fences That Hold Tension Across 800-Foot Runs
Most farm fence failures we get called to repair are corner-brace failures. The fabric and wire are usually fine. What gives out is the H-brace assembly at the corner, which carries all the tension on the run. Build the corners right and the rest of the fence is mostly a question of how much wire you can string. Our contractors build farm fences in Lawrence, Limestone, Madison, and Lincoln counties — cattle, goats, horses, and perimeter — with corners that don't move.
The corner-brace system — where most farm fences win or lose
An H-brace assembly is two posts (corner post and brace post) connected by a horizontal brace, with a tension wire (or rod) running diagonally to lock the geometry. Done right, it holds tension on a 1,000-foot wire run for decades. Done wrong, the corner pulls in over a couple of seasons and the whole fence goes slack.
Corner post: 8-inch diameter, 4-foot deep
Our contractors use 8-inch corner posts (treated pine or locust) set 4 feet deep in concrete. Smaller corner posts will lever out of the ground under tension over time. 8-inch is the minimum we use; on long runs (over 800 feet) we go to 10-inch corners.
Brace post: 6-inch diameter, 8 feet from corner
The brace post sits 8 feet away from the corner with a horizontal pole connecting them at the top. This creates the "H" — the geometry that resists the pull of the wire run.
Diagonal tension wire (not a board)
A double strand of 12.5-gauge high-tensile wire runs diagonally from the bottom of the corner post to the top of the brace post, tensioned with a twitch stick. Our contractors use twisted wire, not a wood diagonal — wood diagonals crack and rot; wire doesn't.
Double-H bracing for long runs
For runs over 660 feet or where wire tension exceeds 200 lbs (high-tensile, goat fence, or heavy-cattle), our contractors use a double-H brace — two H-brace assemblies in sequence. This is what our contractors used on the Elkmont goat farm and the Pulaski-TN limestone job.
Farm fence types we build
Woven wire (field fence)
Best general-purpose farm fence. Standard for cattle, sheep, goats, and mixed-livestock operations. Our contractors use Red Brand or comparable 12.5-gauge woven wire with 6-inch vertical stays for small-livestock containment, 12-inch stays for cattle.
High-tensile (5-strand or 6-strand)
5–6 strands of 12.5-gauge high-tensile smooth wire on heavy-duty insulators. Optional electrification on top and middle strands. Best for cattle on large pastures. Lower material cost per foot than woven wire but requires more disciplined tension and corner work.
4-board (horse fence)
Four horizontal boards on posts, traditional white or oil-based stain. Best for visible horse properties where appearance matters. Our contractors use oak boards by default — pine is cheaper but doesn't hold up to horse leaning. Optional hot-wire on top to discourage chewing/leaning.
Barbed wire
5-strand barbed wire is the standard low-cost perimeter for cattle on rough terrain. Not appropriate for horse or sheep operations. Our contractors use Class III galvanized barbed wire from Bekaert or McMaster-Carr.
Goat-specific fence
Goats are escape artists. Standard cattle fence won't hold them. Our contractors use woven wire with 4-inch by 4-inch openings (sometimes 2-inch by 4-inch for kids) and electric "trip" wires at nose height. See our Elkmont scenario for a real goat fence build.
Predator-deterrent fence
For poultry, sheep, or small livestock in coyote/dog country (most of North Alabama), we add a buried welded-wire apron 12–18 inches deep along the bottom to stop digging predators. Adds about $4–$6 per linear foot.
What we won't build on a farm fence
Single-post corners on long runs
A single corner post — no brace — will fail under tension within a few seasons. Some quotes save money by skipping the brace assembly. That's how you end up with a sagging fence in year three. Our contractors always brace.
UC3B posts in goat or hog pasture
Goats and hogs work the bottom of fence posts. The standard residential UC3B pressure treatment isn't rated for the constant ground contact and abrasion these animals create. Our contractors use UC4B for residential, ground-contact-rated locust or extreme-treated for working livestock fence.
Hand-pulled wire on long runs
Our contractors use a wheeled tensioner for any run over 300 feet. Hand-pulling produces uneven tension that the fence pays for over time in deflection and slack. A $400 tensioner pays for itself on every farm job.
Farm fence FAQ
How much does farm fencing cost per foot?
Wide range depending on type: barbed wire $5–$8/ft, woven wire $8–$15/ft, high-tensile $10–$14/ft, 4-board $25–$40/ft. Gates run $300–$1,200 depending on size (12-foot drive gate to 16-foot equipment gate). Long runs reduce per-foot cost; corner-heavy properties increase it.
What's the right fence for cattle?
5-strand high-tensile or woven wire with 12-inch stays. High-tensile is cheaper material but needs better corner work and disciplined tension. Woven wire is more forgiving and easier to maintain.
What's the right fence for horses?
4-board with oak boards, or 3-board with a hot-wire on top. Our contractors avoid woven wire and high-tensile for horses — they can catch hooves in woven wire and slice tendons on high-tensile. Visibility matters; horses run into fences they can't see.
How long does a farm fence last?
Properly-installed woven wire with treated posts: 25–35 years. Locust posts often outlast treated pine. High-tensile wire: 30+ years if tension is maintained. Corner braces tend to be the wear point — we recommend visual inspection annually.
Can I use my own posts?
Yes — and on most farm jobs we encourage it. Locust posts cured on-site (from clearing) are excellent and free. We just need them debarked and reasonably straight. Our contractors bring treated posts for corner braces where bracing matters most.
Counties we serve for farm and acreage fencing
Ready to get started?
Request your free farm fence estimate. We'll walk the property with you before quoting.