A sagging fence makes your whole yard look neglected — but most fence problems come down to a few common causes that any homeowner can fix in an afternoon without hiring a contractor.
Walk your fence line and identify exactly what is wrong. A leaning post means the post has rotted at ground level or the concrete footing has heaved. A sagging section between posts means a broken or rotted rail. A sagging gate means loose hardware or a settled post. Each problem has a different fix so identifying the cause correctly saves time and money.
Dig around the base of the leaning post to expose the bottom. If the post is rotted cut it off at ground level and attach a metal post anchor to the existing concrete footing. Slide a new post into the anchor and secure it. If the concrete footing has heaved remove it entirely, dig 6 inches deeper, add gravel for drainage, and reset the post in new concrete. Keep the post plumb with temporary braces while the concrete cures for 24 hours.
Fence rails are the horizontal boards connecting the posts. Remove the damaged rail by pulling the nails or screws securing it to each post. Take it to the hardware store to match the size and wood species exactly. Cut the new rail to length and secure it with 3 inch exterior screws — two per post connection. Screws hold far better than nails in outdoor applications.
Most sagging gates are caused by the hinge-side post leaning outward under the weight of the gate. First check that all hinge screws are tight — replace any that spin with longer 3 inch screws. If the gate still sags install an anti-sag gate kit — a cable and turnbuckle system that runs diagonally across the gate frame. Tension the turnbuckle until the gate hangs level. Available at any hardware store for about $15.
After completing your repair apply an exterior wood preservative or stain to all new or exposed wood. This prevents water from penetrating the grain and dramatically extends the life of your repair. Pay special attention to the end grain of any cut boards — this is where water enters and rot begins.
When replacing a fence post always use pressure treated lumber rated for ground contact — marked as UC4B on the label. Standard lumber rots in the ground within 3 to 5 years. Pressure treated ground contact lumber lasts 20 to 40 years and costs only a few dollars more per post.
Call 811 — the national Call Before You Dig hotline — at least 3 business days before digging any post holes. Utility lines are buried in most yards and hitting one can cause serious injury, outages, and legal liability. The service is free and required by law in all 50 states.
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