Repairing A Fence Post

Learn all about replacing fence posts set in concrete that have decayed or rotted. Repairing a fence post can be a lot of work, but following these simple steps will give you fresh posts in no time.

By Jeff Beneke
Updated on May 2, 2023
article image
by AdobeStock/Nick Beer

Learn all about replacing fence posts set in concrete that have decayed or rotted. Repairing a fence post can be a lot of work, but following these simple steps will give you fresh posts in no time.

Correcting Footing Failures

If the posts have loosened or fallen out of plumb, it is likely due to a problem with the footing or backfill. Concrete footings can crack or heave, and a tamped earth-and-gravel footing can soften over time. A failed concrete footing is hard to repair, and the best solution is to replace the fence post and footing. You can tighten the hold of an earth-and-gravel footing by digging out as much of the backfill as you can, replumbing the post, then backfilling and tamping. You might also try fastening pressure-treated shims to all sides of the post before backfilling and tamping.

If a concrete footing seems secure but the post has shrunk away from the concrete and loosened, drive pressure-treated shims into the concrete on all four sides of the post, checking for plumb as you do so. When the shims are tight, trim them level with the concrete and run a bead of clear silicone caulk around the top to seal the joint. This may not provide a long-term solution, but it can buy a few more years.

Mending fence posts that have decayed

illustration of a fence post support partially underground
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