The house had been painted the year before and it looked it. Clean lines at the trim, even sheen, no drips. From the driveway it was a good job.
We were there for something unrelated, and out of habit one of our crew ran an awl along the sill under a front window on the way past.
It went in. Not a little. Up to the handle, through what looked like sound painted wood, into material with the texture of wet cardboard.
We picked at the edge and the story came out in layers. Under the newest coat sat a smear of filler, spread thin across a dip in the sill. No cut-out underneath it. No consolidant. Punky wood, filler over the top, paint over that.
The homeowner had come out to see what we were doing, watched the awl disappear, and asked the only question that actually matters at that moment.
How much more of this is there?
That question has an answer, and getting to it in the right order is what this article is for.
The Short Answer
Paint over rot hides it and feeds it. The film blocks the wood from drying while the decay keeps working underneath.
Confirm how far it goes with a probe test. Document everything before any repair happens. Give the painter written notice and a chance to put it right. Then have the repair done properly, meaning rot cut out or consolidated, wood replaced where it is gone, and only then refinished.
Painted-over rot always comes back. The only question is whether it comes back this year or in three.
Why Paint Over Rot Always Fails
Understanding the mechanism makes the rest of your decisions easier.
Wood rot is fungal decay, and it needs moisture in the wood to keep working. Wood that dries out stops decaying. Wood that stays damp does not.
Now add a coat of paint. It keeps water out to a degree, and it also slows the wood’s ability to release the moisture already inside. So the decay does not stop. It continues under a sealed skin, out of sight, in conditions that suit it.
Eventually the wood loses enough structure that the paint film has nothing to hold, and the failure returns as bubbling, cracking, or a soft patch that crumbles when pressed. That usually shows up within a season or two, which is why so many people find this within a year of paying for a paint job.
The paint did not cause the rot. It just bought silence for a while.
Find Out How Much Is Hiding: The Twenty Minute Inspection
Do this before you make any calls. It costs nothing and it determines everything that follows.
You need a flat screwdriver or an awl, your phone, and a methodical route around the house.
Start with the usual suspects. Window sills, door thresholds, the bottom of trim boards, fascia, water tables, porch posts and rails, and anywhere within a couple of feet of the ground.
Probe with consistent pressure. Push the tool in at a shallow angle with moderate, repeatable force. Sound wood resists. Early decay gives slightly. Advanced rot swallows the tool.
Read the caulk. Fresh caulk smeared across a dip, a gap or an uneven surface is a tell. Caulk belongs in joints, not spread over depressions in a flat board.
Read the surface. Bubbling or cracking that appeared within a year of painting is suspicious. So is a patch of surface that feels slightly spongy or sounds dull when tapped.
Look for filler texture. Under raking light, filler shows differently than wood. Wide, flat, vaguely smooth patches over what should be grain are worth probing.
Consider a moisture meter. Inexpensive ones are fine for this, and we’re happy to walk you through what to look for if you have questions. Readings above roughly 18 percent indicate moisture levels where decay stays active, a threshold This Old House uses in its rot guidance.
Photograph everything as you go. Every probe, every soft spot, with something for scale. Date-stamped phone photos are ideal.
That last step is not optional if you intend to hold anyone accountable. Once a repair happens, the evidence is gone.
Mark each soft spot with tape as you find them. When you step back at the end, the tape usually draws you a picture of where water has been getting in.
Did They Know?
This is the question people turn over at night, so let us be fair about it.
Sometimes a painter genuinely does not know. Rot hides. A board can look acceptable from a ladder and still be soft in a spot nobody pressed. Prep moves fast, and not every square inch of a house gets probed.
But probing sills, trim bottoms and fascia is standard practice on an exterior repaint, precisely because those are the known hiding places. Any experienced painter knows where to check.
So the honest framing is this. Either the check was skipped, or the check happened and the fix was skipped. Both are failures of the job you paid for. The difference matters mostly for how you open the conversation.
A painter who missed it will often want to make it right, because reputation is the asset. Someone who filled over punky wood and painted it knew what they were doing, and you will find out which you have by how they answer your first message.
Start by assuming it was a miss. It costs you nothing, and it makes the next step stronger if you turn out to be wrong.
Holding the Painter Accountable in Kentucky
General information here, not legal advice. For anything significant, talk to a Kentucky attorney.
Start with written notice. Email or certified letter. Set out what your contract or estimate said about preparation, what you found, where you found it, and what you want done. Attach the photographs. Give a specific deadline, commonly 7 to 14 days, and say what you will do if it passes.
Most contracts and estimates include some description of surface preparation. Quote that language back. It is the strongest thing you have.
If that goes nowhere, the Kentucky Attorney General’s Office of Consumer Protection accepts complaints through its Consumer Complaint and Mediation Request form at ag.ky.gov, main line (502) 696-5300. The office will ask the business to respond. Be aware of the limits: in the office’s own words, if a business does not respond or refuses to cooperate, there is generally nothing further it can do except track the information. It also cannot act as your private attorney or sue solely to recover your money.
File with the BBB serving Greater Kentucky and South Central Indiana at the same time, and see what other homeowners have said about contractors they have worked with.
Small claims is genuinely worth considering here, and almost nobody mentions it on this topic.
Kentucky’s small claims division of district court handles claims of $2,500 or less, with no lawyer required. Now look at the repair numbers below: HomeAdvisor puts average wood siding repair around $1,696, with typical projects running $699 to $2,843. A great many rot repairs land under the $2,500 ceiling, which means small claims is not a theoretical option for this problem. It is the right-sized one.
File through the circuit court clerk in the appropriate county. Bring your photographs, your contract, your written notice and your repair estimate.
If your painter also stopped showing up, our post on when a painter abandons the job covers the full Kentucky recovery ladder in detail.
What the Repair Should Look Like
Knowing the standard protects you twice: it tells you whether the original work was acceptable, and it sets the bar for whoever fixes it.
Small and Shallow
Where decay is limited to the outer layer and the surrounding wood is firm, the repair is consolidation.
Remove all the soft material back to sound wood. Apply a liquid epoxy consolidant, which soaks into the remaining fibers and hardens them. Fill with a two-part structural epoxy filler, shape and sand, then prime.
The critical word is remove. Filler applied over soft wood without removing it first is the exact failure you are dealing with now.
Localized but Deep
Where the rot goes through the board but the surrounding wood is sound, the usual repair is a dutchman: cutting out the damaged section cleanly and letting in a matching piece of new wood, glued and fastened.
Done well it is nearly invisible and it lasts. It is real carpentry rather than a filler job.
Widespread or Structural
Where a board has lost its structure over any significant length, it gets replaced.
Whoever does it should also check what is behind it. If the probe passes through the trim or siding into soft material beyond, water has been in the wall assembly and that needs opening up rather than covering back over.
What It Costs
| Work | Typical cost | Source |
| Wood siding and trim repair, typical project | $699 to $2,843, around $1,696 average | HomeAdvisor |
| Extensive rot, board replacement | $6.25 to $18.75 per sq ft | Angi |
| Water damage repair | $3 to $7.50 per sq ft | Angi |
| Labor | $40 to $90 per hour | HomeAdvisor |
Keep that first row in mind alongside the $2,500 small claims ceiling. The overlap is not a coincidence.
Making Sure the Next Contractor Cannot Skip It
Here is how to buy prep you can actually verify.
Require these in writing, in the contract, before work starts:
A probe inspection before the quote is final, with the findings written down
Rot repair as a separate line item, priced, rather than buried in a lump sum where it can quietly vanish
Photographs of every repair before the finish goes on, sent to you
A stated rule that no coating goes over unrepaired wood
Any contractor who is actually doing this work will agree to all four without hesitation, because it costs them nothing to document what they were doing anyway. Hesitation is your answer.
Now the part where we tell you how we are set up, because it is relevant to the question you are really asking.
Rhino Shield is a ceramic coating rather than a paint, spray applied at 8 to 10 times the thickness of standard paint, and it carries a 25-year transferable warranty.
That warranty is why we cannot do what was done to your house. A coating that we have to stand behind for 25 years cannot sit on decaying wood, because the wood will fail long before the warranty does and we will be the ones back on that wall. Rot gets found during inspection, repaired, and only then coated.
That is an incentive, not a virtue. It is worth more than a promise precisely because it costs us money to get wrong.
For background on how rot develops and what it does to an exterior, see our page on wood rot repair. If you are also finding give in the siding itself, our post on soft spots in wood siding walks through the triage.
Louisville Homes and Hidden Rot
Local conditions make this more common here than in drier climates.
Louisville takes roughly 45 inches of rain a year with humid summers, so exterior wood spends a large part of the year damp enough for decay to stay active. Winters cross the freezing line repeatedly rather than staying cold, and each cycle works on the paint film, opening the micro-cracks that let water reach the wood in the first place.
The housing stock does the rest. Old Louisville holds one of the largest collections of Victorian-era homes in the country, and the Highlands and Germantown carry blocks of late-1800s and early-1900s frame houses. Original sills, water tables, porch posts and deep trim, much of it painted a dozen times over a century.
That layered paint history is exactly why rot hides so well on these houses. There is a lot of coating between you and the wood.
Frequently Asked Questions
Is it ever OK to paint over rotted wood? No. Paint does not stop decay, and it slows the wood’s ability to dry, which is the one thing that would stop it. Rot gets removed or consolidated before any finish goes on.
What happens to rot under paint? It keeps going. The decay continues under a sealed surface until the wood loses enough structure that the paint film fails, showing up as bubbling, cracking or a soft patch, usually within a season or two.
How do I find rot that was painted over? Probe with a screwdriver or awl at sills, trim bottoms, fascia and anywhere near the ground, using consistent pressure. Look for fresh caulk smeared over dips, wide filler patches under raking light, and any bubbling that appeared soon after painting.
Can I make the painter pay for the repair? Often, yes. Start with written notice quoting the preparation language in your contract, with photographs attached and a deadline. If that fails, the Kentucky Attorney General’s consumer complaint process and small claims court are both available.
Is small claims worth it for a rot repair? Frequently. Kentucky’s limit is $2,500 with no lawyer required, and typical wood repair projects average around $1,696. That is one of the better fits between a common problem and a court designed for it.
Should rotted trim be repaired or replaced? Depends on depth. Shallow decay with sound wood around it can be consolidated with epoxy and filled. Rot through the board is cut out and replaced, either as a let-in dutchman or a full board.
How fast does wood rot spread? It depends entirely on moisture. Dry the wood and decay stalls. Keep it wet, as a paint film over damp wood tends to, and damage progresses steadily through the seasons.
How do I know a coating company will not do the same thing? Ask what happens to their warranty if the substrate fails. A company offering a long warranty on the coating has to care about what is under it, because they are the ones who come back. Then require the four written items above from whoever you hire, including us. A promise is worth less than a contract clause and a photograph.
Get the Whole Story Before Anyone Repaints
If your probe found one soft sill, you may have a small repair and an awkward phone call ahead.
If the tape marks are multiplying, stop and document before you do anything else. The photographs you take this week are worth more than anything you can say later.
We will come out and probe the exterior for free, mark what we find, and give you a written assessment of the condition. That assessment is useful to you whether you hire us, hire someone else, or take it to small claims. We are happy for it to be used either way.
And if the answer is that the wood needs a carpenter before it needs a coating, we will tell you that too.
Get my free estimate or call (855) 744-6605. You can also read what our customers say.
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