We get called to look at failed floors regularly. Almost all of them fall into four categories, and three of the four are specific to how a Kansas winter treats concrete.
1. De-icing salt and chloride attack
Sedgwick County and KDOT run rock salt and magnesium chloride brine from roughly November through March. Your tyres and wheel wells carry that slurry into the garage, where it sits and melts into a puddle on the slab. Chloride is aggressive: it attacks bare concrete directly, and wherever a coating has a weak bond — an unground edge, a thin threshold termination, a hairline gap at a control joint — the brine creeps underneath and lifts it.
Magnesium chloride is the worse of the two. It stays liquid at lower temperatures than rock salt, which means it stays in contact with your floor longer, and it chemically reacts with the calcium hydroxide in concrete to form a compound that expands.
How to avoid it. Properly ground perimeter and a clean, thick termination at the threshold. A chemically resistant polyaspartic topcoat. And rinse the floor a few times over the winter — it costs nothing and it is the single most effective thing a homeowner can do here.
2. Freeze-thaw cycling
Wichita sees somewhere between 80 and 110 freeze-thaw cycles in a typical year — far more than colder cities that simply stay frozen. Each cycle, water that has soaked into the top few millimetres of concrete freezes and expands by roughly nine percent, prising the surface apart from within. Repeat that a hundred times a winter and the top layer fails.
This is why so many garage thresholds in this town are pitted and crumbling. It is also why coating over already-spalled concrete achieves nothing: the coating is only as sound as the surface it is bonded to, and that surface has already come apart.
How to avoid it. Repair spalled areas back to sound concrete before coating, not over them. Keep water off the slab where you can — a working garage door seal matters more here than most people realise.
3. Expansive clay and slab movement
Much of Sedgwick County sits on clay-rich soils that swell significantly when they take on water and shrink when they dry out. Through a Kansas year — wet spring, dry August — that means real seasonal movement under your slab.
A garage slab riding on moving subgrade develops cracks, and a rigid coating over an actively moving crack will split along the same line every time. This is the failure people find most frustrating, because the coating itself is usually fine everywhere else.
How to avoid it. Establish whether a crack is dormant or active before coating. Dormant cracks route, fill and disappear. Active ones need the cause addressed first, and that is a drainage or foundation conversation rather than a flooring one. Where there is minor seasonal movement, a semi-flexible polyurea base accommodates it far better than a rigid epoxy.
4. Summer humidity and amine blush
Wichita summers run genuinely humid, with dew points regularly in the seventies. When epoxy cures at high humidity, unreacted amine in the hardener reacts with moisture and carbon dioxide in the air to form a waxy film on the surface — amine blush.
The problem is that blush is nearly invisible. The floor looks fine. But the next coat cannot bond through it, so you get a system where the topcoat is sitting on a greasy layer rather than keyed to the coat below. It peels months later, cleanly, with no obvious cause.
How to avoid it. Track dew point rather than relative humidity, do not apply when the slab is within five degrees of it, and wash between coats if there is any doubt. This is also a strong argument for polyaspartic, which is far less prone to blushing.
Two failures that are not climate related
Perimeter delamination
The floor looks perfect across the open field and is lifting along the walls. A walk-behind grinder cannot reach the last inch or two, and hand grinding that perimeter is slow, uncomfortable work. Skip it and you have unprepared concrete exactly where salt slurry and meltwater collect. In this climate that is the worst possible place to cut a corner.
Cold-cured or off-ratio material
Standard epoxy effectively stops curing below about 55°F, and an unheated Wichita garage sits below that from November to March. Material applied in those conditions may skin over and look finished while never reaching full hardness. It stays soft, and everything else on this page then damages it far more easily.
What a failure timeline usually looks like
| When it shows | Most likely cause |
|---|---|
| Days to weeks | Off-ratio mix, applied too cold, or over a wet or contaminated slab |
| First winter | Salt working under a weak edge or threshold |
| 3–12 months | Inadequate profile, or amine blush between coats |
| 1–2 years | Moisture drive from the slab; freeze-thaw at a failed threshold |
| Seasonally, same line each year | Active substrate movement over clay |
| 10+ years | Normal wear. This is a recoat, not a failure |
The pattern worth noticing: almost everything before year three traces to installation rather than to the product or to how you used the floor.
Diagnosing your own floor
| What you see | Most likely cause |
|---|---|
| Lifting at the threshold and creeping inward | Chloride attack under a weak edge |
| Pitted, crumbling concrete at the door | Freeze-thaw damage to the slab itself |
| Round raised bubbles across the field | Moisture drive from below |
| Large sheets lifting cleanly, smooth concrete underneath | Inadequate prep, or amine blush |
| Coating gone at the perimeter only | Edges never ground |
| The same crack reopening every spring | Clay movement under the slab |
| Soft or tacky floor that never hardened | Applied too cold, or mixed off-ratio |
Send us a photo and we'll tell you which of these you're looking at, whether or not you hire us. The diagnosis is usually obvious to someone who sees these weekly, and it changes what you should be asking other contractors.
If your floor is failing now
- Photograph it — wide shot plus close-ups of the failure edge.
- Find your paperwork. If it is under five years old there may be a live warranty, and that conversation should happen before you pay anyone else.
- Do not coat over it. Whatever it costs to remove properly, it costs more to remove twice.
- Establish the cause before the fix. A salt failure recoated without fixing the edge detail will simply fail at the same edge.
The uncomfortable summary
Almost none of these are product failures. The coatings sold today are excellent, and even mid-tier products perform well when installed correctly. What fails is process: the slab was not ground, or not tested, or the crew applied in December in an unheated garage, or nobody watched the dew point in July.
That is genuinely good news for you as a buyer, because it means the questions that predict a good outcome are answerable before you sign anything.
Two failure modes that are not climate related
The four above are the Wichita-specific ones. Two more account for most of what remains, and they are pure workmanship.
Perimeter delamination
The floor looks perfect across the open field and is lifting along the walls. This is the signature of skipped edge grinding — a walk-behind machine cannot reach the last inch or two, and hand grinding that perimeter is slow, uncomfortable work. Skip it and you have unprepared concrete exactly where water and cleaning solution collect.
It is also the easiest failure to spot early. Look at the last inch against your wall. If the coating looks thinner there, or you can see where the machine stopped, that is what you are looking at.
Off-ratio or cold-cured material
Two-part resins cure by chemical reaction, and the ratio is not approximate. Material mixed by eye, or mixed in a partial batch without measuring, does not fully cross-link. It stays soft indefinitely — not tacky necessarily, but softer than specification, which makes it far more vulnerable to everything else on this page. Hot tire pickup on a floor that should have resisted it often traces back here.
What a failure timeline usually looks like
| When it shows | Most likely cause |
|---|---|
| Days to weeks | Off-ratio mix, applied over a wet or contaminated slab, or parked on too early |
| 3–12 months | Inadequate profile. The bond was marginal from the start and thermal cycling finished it |
| 1–2 years | Moisture drive, or hot tire pickup on an under-specified product |
| 2–4 years | UV ambering becoming obvious; thin-build wear in traffic paths |
| 10+ years | Normal wear. This is a recoat, not a failure |
The pattern worth noticing: almost everything before year three traces to installation rather than to the product or to how you used the floor.
If your floor is failing now
- Photograph it — wide shot plus close-ups of the failure edge.
- Find your paperwork. If it is under five years old there may be a live warranty, and that conversation should happen before you pay anyone else.
- Do not coat over it. Whatever it costs to remove properly, it costs more to remove twice.
- Establish the cause before the fix. A moisture failure recoated without mitigation will simply blister again.
Send us the photos either way. We will tell you which of these you are looking at, whether or not you hire us — and knowing changes what you should be asking whoever quotes it.
The uncomfortable summary
Almost none of these failures are product failures. The coatings sold today are excellent, and even mid-tier products perform well when installed correctly. What fails is process: the slab was not ground, or not tested, or the topcoat was chosen on price, or the crew was working too fast in too much heat.
That is genuinely good news for you as a buyer, because it means the questions that predict a good outcome are answerable before you sign anything.
Common questions
My floor is only two years old and it's already lifting. Is that normal?
No. A properly installed floor should go 15 years or more before it needs anything beyond a topcoat refresh. Failure at two years points to prep or application conditions, not wear.
In this market the most common cause at that age is salt getting under a poorly terminated edge. Look first at where it started — if it began at the threshold, that is almost certainly it.
Does road salt really damage a coated floor?
It damages a badly coated floor. A sound, properly bonded polyaspartic system handles chloride exposure without issue — that is what gets specified for commercial entryways in snow markets.
What salt exploits is a weak bond. Any gap at an edge, threshold or joint gives brine a route underneath, and once it is under the film, it lifts it from below where the coating has no defence.
Should I rinse my garage floor in winter?
Yes, and it is the highest-value thing you can do. A few rinses across the season stops chloride concentrating as the meltwater evaporates.
If you have a floor drain it is trivial. If not, squeegee it out the door. Either way it takes ten minutes and it meaningfully extends the life of both the coating and the concrete under it.
Can a failed floor be repaired rather than replaced?
Depends on how much is failing and why. Isolated failure over an otherwise well-bonded floor can be cut out, re-prepped and patched, though colour matching an aged floor is imperfect.
Widespread failure, or failure caused by moisture or blush, means full removal. Patching over those just relocates the problem.
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