Across Florida · Vetted local pros
Why are the bottoms of my wood fence posts rotting so quickly?
A straight answer first, then what you can safely check yourself and when to get a pro. Free estimates from a vetted MB pro near you.
Wood posts rot first at the ground line because that is where moisture, air and warmth meet every day. In Florida's humid, rainy climate, a post that is not rated for ground contact, or is set so water pools around it, can decay and attract termites far faster than you would expect.
The nuance: the post is often not the only problem. Sprinklers, soil piled against the wood, a concrete collar that traps water, or termites can each be the real cause, and a replacement post will fail the same way if that cause is not fixed.
Why the ground line is where posts fail
Wood rots when it stays damp and can still breathe. Below the soil it is wet but gets little air, and well above the soil it dries out. Right at the ground line, it gets wet and dries over and over, which is the ideal condition for decay fungi. Florida's long wet season, daily storms and year-round humidity keep that cycle going for much of the year.
Several things speed it up. Lumber not treated for ground contact has little defense. Cut ends and drilled holes expose untreated wood inside the post. A post set in a concrete collar can trap water against the wood like a bowl. Soil, mulch or sod built up against pickets and rails keeps them wet. Sprinkler heads that hit the fence soak it again and again.
Termites add to the damage. Softened wood at the ground line is easy for them to feed on, and sandy soil can leave a weakened post loose even before it fully rots. Once a post is weak, wind on a solid privacy panel can lean or snap it, which matters during hurricane season.
What you can check yourself
Look at the ground line
Check each post where it meets the soil for dark, soft, crumbly or stringy wood, and for cracks or hollow-looking areas. Note which posts are worst, since a pattern often points to a cause.
Test the wood gently
Press a screwdriver tip into the wood just above the soil. Sound wood resists, while rotted wood sinks in easily. Stay on the ground, and skip any post that already leans badly.
Watch your sprinklers
Run the irrigation and see whether spray hits the fence or runs against the posts. Redirecting a head is a simple fix.
Check the grade and the base
Look for soil, mulch or turf piled against the wood and for water pooling at the posts after rain. Also look for a concrete collar sloping toward the post, which holds water.
Look for termite signs
Look, without disturbing anything, for thin mud tubes on posts or concrete, or for tunnelled wood. If you see them, note where and photograph them for the pro.
When to call a pro
Call a pro if posts lean, wobble when you lightly push on them, or are soft through, if several are affected, or if you see termite signs. Do not lean on or climb a failing fence, and do not try to prop up a tall privacy fence yourself ahead of a storm. If the fence is a pool barrier, a damaged post or gate affects safety, so get it looked at promptly.
Fences usually need a building permit in Florida cities, and post replacement may count depending on the scope. Your pro pulls it, so verify the requirements with your local building department. If you are in an HOA, you may also need association approval. If the pro will rebuild on a new line, a survey avoids putting the fence on the wrong side of a property line. If any part of the job requires a state license, you can verify it on the Florida DBPR website. We match you with a vetted pro near you.
Your MB pro handles the permit when the job needs one. You can look up a contractor's license at Florida DBPR.
What a pro will do
- Find the cause firstYour MB pro will check drainage, grade, irrigation and termite signs along with the posts, so the new work does not fail the same way.
- Reset or replace postsDepending on how far the decay has gone, the pro can reset posts, replace them, or replace panels and pickets that were damaged along with them.
- Set posts to lastAsk the pro what wood grade they use for ground contact, how the post base will drain, and whether another material such as vinyl, aluminum or steel makes sense.
- Handle permit and surveyYour pro handles the permit where one is required and can advise when a survey is needed. Ask about both before work starts.
- Give a free estimateCost depends on fence length and height, access, material, how many posts are bad, permit needs and what is found once the fence is opened up. Your MB pro provides the free estimate.
How it works
Step 1
Tell us what you need
Call or send the short form with your city and the job. Estimates are free.
Step 2
We match you with a vetted pro near you
We pick a vetted pro from our network who works in your part of Florida and book the visit.
Step 3
Your pro gives a free estimate and does the work
Your MB pro looks at the job and gives you a free estimate. You decide whether to go ahead — and we stay your point of contact.
Related questions
- Can I just replace the rotted posts myself?
- You can for a short, low section if you are comfortable with it, but posts that are tied into a tall privacy fence, a gate or a pool barrier are better left to a pro. Fix the moisture or termite cause first or the new posts will rot the same way.
- Is pressure-treated wood enough to stop post rot?
- Wood rated for ground contact lasts much longer than untreated wood, but it is not rot-proof, especially with cut ends, standing water or constant sprinkler spray. Good drainage at the base matters as much as the wood.
- Does termite damage at the posts mean the house is at risk?
- Not necessarily, but it is worth having it looked at. Termites near a fence may or may not be active near the home. A pest control professional can inspect, and your fence pro can avoid wood-to-house contact when rebuilding.
- Will a hurricane be harder on a fence with rotted posts?
- It can be. Solid privacy panels catch wind, and weakened posts at the ground line are where leaning and breaking tend to start. Having soft posts fixed before the June 1 to November 30 hurricane season is a sensible step.
Request a free fencing estimate
Tell us what's going on. We'll match you with a vetted pro near you.
- 1Tell us what you need.
- 2We match you with a vetted pro near you.
- 3Your pro gives a free estimate and does the work.
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