Much of the land along and east of I-35, including Temple, Waco, Round Rock and Georgetown, sits on Blackland Prairie clay. It is dark, dense and sticky when wet, and it hardens and cracks when dry.
What the soil does
The clay absorbs water and swells in volume, then shrinks as it dries out. A fence post set in it is pushed and pulled through that cycle every year. Over time the post works loose, tilts, or lifts slightly, and the fence line starts to lean or sag.
Why some fences fail faster
- Posts set with only loose soil or a shallow hole have little to resist the movement.
- Posts that sit in wet ground rot at the base, which weakens them right where the soil pushes hardest.
- Long runs with no corner bracing give wind and soil movement an easy path to pull the whole line over.
- Gutters and downspouts that dump water beside a fence keep that soil wetter than the rest and add to the swing.
What holds up better
- Setting posts deep and in concrete, with the top of the concrete sloped so water runs away from the wood.
- Replacing rotted posts instead of bracing them. A brace on a rotted post only hides the problem for a season.
- Fixing drainage near the fence, so water is not collecting at the base of the posts.
- Re-sealing the wood on schedule, since sealed posts and boards take on less water and rot slower.
Repair or replace?
A few leaning posts or a rotted board are normally a repair. If most of the posts are loose or rotted at the base, replacing that section costs less over time than patching it repeatedly. We will tell you which it is after looking at the fence, and if you plan to stain afterward, we can do the repair first so the finish goes on sound wood.
Common questions
Why do fence posts lean in Central Texas?
How do you fix a leaning fence?
Should I repair or replace a leaning fence?
Related: Fence repair, How to prep a fence before staining (and why skipping it costs you)
Want it done right the first time? We clean, protect and finish fences across Central Texas.