A factory floor almost never fails because the coating was bad. It fails because of how the job was done — decisions made before the first coat went down, usually to save a day or shave a quote. The symptom on your floor right now tells you which decision it was. Here is how to read it, and how each one gets designed out.
The short answer
Factory floors fail at the bond, not in the coating. The four leading causes are moisture rising through the slab, inadequate preparation, contamination the grinder never reached, and the wrong system specified for the duty. All four are decided before installation — which is why failures trace back to the quote rather than the product.
Read the symptom first
Before anyone quotes you a repair, work out what actually went wrong. The failure pattern is diagnostic.
| What you are seeing | Most likely cause |
|---|---|
| Blisters or bubbles, appearing weeks or months later | Moisture in the slab |
| Peeling away in sheets, clean concrete underneath | Preparation or contamination |
| A crack running dead straight across the floor | An expansion joint coated over |
| Lifting at edges, around drains and plinths first | Edge preparation skipped |
| Worn through in forklift lanes only | Film too thin, or under-specified for the duty |
| Pitting or erosion in patches | Chemical attack beyond the system rating |
| Lifting after steam cleaning or washdown | Thermal shock — wrong system |
| Chalky, powdery surface | UV exposure or an under-cured coating |
One useful test costs nothing: tap the area with a coin or a screwdriver handle. A sharp sound means the coating is still bonded. A hollow, drummy sound means the bond has already gone, even where the surface looks perfectly intact. Map the hollow areas and you have the real extent of the problem, which is almost always larger than the visible damage.
Cause 1 — Moisture
The single most common cause of industrial floor failure, and the one people find hardest to accept because the floor looked perfect on handover.
Concrete is porous. Water vapour moves up through a slab continuously, and under an impermeable coating it has nowhere to go. Pressure builds underneath until it lifts the coating away in blisters. Pop one and the underside is damp.
Two things make this worse in older factories. Many older slabs have no vapour barrier — plastic sheeting under slabs is a relatively modern standard, so a 1970s factory floor may be sitting directly on ground. And a slab that was dry when tested can become wet later if site drainage changes or a water table rises.
Proper testing means in-situ relative humidity probes drilled into the slab, not a surface reading or a plastic sheet taped down overnight. Most systems need the slab below roughly 75 to 80 percent internal RH. Above that you need a moisture-barrier primer, which adds cost and a day — and costs a fraction of redoing the floor.
Cause 2 — Preparation
Coatings bond mechanically into an opened concrete profile. No profile, no bond, whatever the resin costs.
The specific issue on industrial slabs is laitance — the weak, cement-rich layer that forms at the surface as concrete cures. It looks like sound concrete. It has almost no strength. Coat over it and your expensive floor is bonded to a layer that will crumble, taking the coating with it.
Removing it means mechanical preparation. Diamond grinding suits most floors. Shot blasting is the better choice for very large areas, heavy contamination or removing thick existing coatings. Acid etching is not preparation and never was — the reasoning is set out in diamond grinding vs acid etching.
Edges, drains, plinths and the perimeter need separate attention. They are the first place a floor lifts, because they are the first place preparation gets rushed.
Cause 3 — Contamination
Oil and grease are the obvious enemies, and grinding removes most of what sits near the surface.
The harder problems are the ones that soak deep: silicone, siloxane, fatty acids and some concrete release agents. These penetrate well below the grinding depth and defeat adhesion even on a slab that looks and feels perfectly prepared. Food processing plants and mechanical workshops are the usual candidates.
They are dealt with by degreasing and, where contamination is severe, a specialist tolerant primer. What they cannot be dealt with by is ignoring them and hoping.
Cause 4 — The wrong system for the duty
This is the failure that is nobody's fault on the day and everybody's problem a year later: the installation was competent, but the system was never right for what the floor does.
Coating or screed?
| Epoxy coating | Epoxy or PU screed | |
|---|---|---|
| Thickness | Under 1mm, rolled or squeegeed | Several millimetres, trowel applied |
| Best for | Protection, cleanability, appearance | Heavy impact, rebuilding a worn surface |
| Handles | Foot traffic, forklifts, general duty | Pallet drops, point loads, harsh duty |
| Cost | Lower | Significantly higher |
Heat and washdown
Standard epoxy tolerates moderate heat. What it does not tolerate is repeated steam cleaning, hot washdown or constant wet service — which describes most food processing floors.
For those, polyurethane cement screed is the appropriate system. It handles far higher temperatures and thermal cycling than epoxy, which is precisely why wet-process factories specify it. Putting epoxy in that environment is not a cheaper version of the right answer; it is the wrong answer with a shorter life.
Cause 5 — Expansion joints
If your floor has cracked in a dead straight line, this is almost certainly it.
Expansion and control joints exist so the slab can move. It will move, seasonally and under load. A rigid coating run straight across a joint has nowhere to accommodate that movement, so it splits along the line — usually within the first year.
Handled properly, the joint is saw-cut clean, a backer rod is installed to control depth, and a flexible joint filler is applied that moves with the slab. The coating stops at the joint rather than bridging it. Done well it is barely visible and it does not crack.
Any industrial quote that makes no mention of joints has not looked at your floor properly.
Cause 6 — Thermal shock
Rapid temperature change stresses the bond, because concrete and coating expand at different rates. The usual sources are steam cleaning, hot washdown, and cold rooms sitting alongside warm production areas.
It shows up as lifting or cracking that appears after a cleaning regime changes — a new steam lance, a hotter wash cycle — rather than after any change to the floor itself. If your floor started failing when your cleaning did, this is why.
Cause 7 — Back in service too soon
The most preventable failure on this list.
A coating that has not reached full chemical cure is soft. Forklift traffic, a dropped pallet or a chemical spill inside that window leaves permanent damage in a floor that was installed perfectly correctly.
Cure schedules vary by system and stretch considerably in cold weather. Fast-cure specifications exist precisely so that businesses that cannot afford the wait do not have to take the risk — covered in how long a commercial epoxy floor puts your business out of action.
None of this is bad luck
Read back through those seven causes and one thing stands out: every single one is a decision, not an accident.
Nobody's floor blistered because of misfortune. It blistered because the slab was never moisture tested. Nothing peeled off in sheets by chance — it peeled because laitance was left on, or because acid was used where a grinder was needed. Straight-line cracks are not the slab misbehaving; they are a joint someone chose to roll straight over because cutting it in properly took another hour.
That is the uncomfortable part of industrial flooring. The failures are predictable, well understood, and almost entirely preventable — which means when a floor fails, it is usually telling you what got skipped.
How we design each failure out
Our process is built around this list. Not as marketing — literally, step by step, each stage exists because of a specific way floors fail.
| The failure | What we do about it |
|---|---|
| Moisture blistering | Every slab is moisture tested before we quote, not after we start. If the reading is high, a moisture-barrier primer is specified and priced up front — never discovered mid-job. |
| Bond failure from laitance | Diamond grinding with dust extraction on every floor. No acid etching, no exceptions, no "clean and coat" on any job we take. |
| Edge and perimeter lifting | Edges, drains, plinths and the perimeter are ground separately with an edge machine, because that is where floors lift first. |
| Contamination defeating adhesion | Suspect areas are probed at the measure, not assumed. Deep oil, silicone or release agent contamination gets degreasing and a tolerant primer. |
| Straight-line cracking at joints | Joints are saw-cut clean, backer rod installed, flexible filler applied. The coating stops at the joint instead of bridging it. |
| Thermal shock lifting | We ask what actually happens on your floor — steam cleaning, washdown, cold rooms — and specify a polyurethane cement screed where epoxy is the wrong system, rather than selling you the cheaper one. |
| Wear-through in traffic lanes | Film thickness is specified for the duty, with heavier build in pick paths and forklift lanes rather than one averaged spec across the whole floor. |
| Damage from early return to service | You get a written day-by-day schedule with real return-to-service times per area, and fast-cure options where downtime is expensive. |
Every one of those costs us time on site. That is exactly why they are the first things a cheap quote removes — and why a quote that is materially cheaper than ours is usually not the same job.
What we will not claim
No floor is immune to everything. A dropped die, a forklift tine, a chemical outside the system's rating or a slab that moves significantly will mark any coating, ours included — and our written warranty says so plainly rather than burying it.
What we will say is this: the failure modes on this page are the ones caused by how the work is done, and they are the ones we build our process to eliminate. Preparation, testing, joint detailing and correct specification are not upgrades on our quotes. They are the job.
If a contractor tells you their floor can never fail under any conditions, they are telling you something useful about how carefully they read a specification.
Can it be repaired, or does it all come off?
It depends entirely on whether the coating is still bonded, which is what the tap test tells you.
| Situation | Likely approach |
|---|---|
| Isolated damage, floor otherwise sound and bonded | Cut out, prepare, patch and blend |
| Wear through in traffic lanes only | Abrade and recoat those areas, heavier spec |
| Straight-line cracking at joints | Cut joints in properly, fill flexibly, patch |
| Blistering across an area | Remove that area, address moisture, rebuild |
| Widespread sheet peeling | Full removal and reinstallation |
The uncomfortable arithmetic: fixing a failed floor costs more than doing it properly first time, because the failed coating has to come off before anything else can start, and removal is slow, dusty, disruptive work. General repair principles are in can epoxy flooring be repaired.
What a specification should contain
Judge an industrial flooring quote on whether it engages with your floor or just measures it.
- Moisture test results, with the method stated
- Preparation method named — grinding or shot blasting, and why
- How joints will be treated
- The system, by product, with its chemical and thermal limits
- Film thickness or screed depth, and where it varies for traffic lanes
- Cure schedule and return-to-service times per area
- What would constitute a variation and how it gets communicated
A quote that gives you a rate per square metre and a total has not done any of this. The broader question set is in what an epoxy service provider actually does, and machinery loading in can commercial epoxy flooring handle heavy machinery.
Frequently asked questions
Why do factory epoxy floors fail?
Almost always at the bond, not the coating. The four leading causes are moisture in the slab, inadequate surface preparation, contamination the grinder never reached, and the wrong system specified for the duty. All four are decided before the first coat goes down.
What does moisture failure look like?
Blisters or bubbles under the coating, often appearing weeks or months after installation rather than immediately. Pop one and the underside is usually damp. It happens when water vapour rising through the slab has nowhere to escape and lifts the coating from beneath.
How do you test a slab for moisture?
In-situ relative humidity probes drilled into the slab are the reliable method. Surface tests and plastic-sheet checks give a rough indication only. Most coating systems need the slab below about 75 to 80 percent internal relative humidity, or a moisture-barrier primer to manage what is there.
Do older factory slabs have a vapour barrier?
Often not. Plastic sheeting under slabs became standard practice relatively recently, so many older industrial floors sit directly on ground with nothing stopping moisture rising. That is why moisture testing matters more on an old slab, not less.
What is laitance and why does it matter?
Laitance is the weak, cement-rich layer that forms at the surface as concrete cures. It looks like sound concrete but has very little strength. Coating over it means your floor is bonded to a layer that will crumble away. It has to be removed mechanically.
Is diamond grinding enough for a factory floor?
For most, yes. For very large areas, heavily contaminated slabs or thick coating build, shot blasting is the more appropriate preparation. The right answer depends on the slab and the system, which is one reason a proper site assessment matters on industrial work.
What contamination causes coating failure?
Oil and grease are the obvious ones. The harder cases are silicone, siloxane, fatty acids and some release agents, which penetrate deep into concrete and defeat adhesion even after grinding. They need degreasing and sometimes a specialist primer.
Why does my floor crack in a straight line?
Almost certainly an expansion or control joint that was coated over. The slab moves at that joint by design. A rigid coating bridged across it has nowhere to go, so it splits along the line. Joints must be honoured, not hidden.
How should expansion joints be treated?
The joint is saw-cut clean, a backer rod is installed to control depth, and a flexible joint filler is applied that moves with the slab. The coating stops at the joint rather than running across it. Done properly it is barely visible and it does not crack.
What is thermal shock and which floors suffer it?
Rapid temperature change — steam cleaning, hot washdown, a cold room next to a warm production area. Concrete and coating expand at different rates, and the stress breaks the bond. It is common in food processing, commercial kitchens and cold storage.
Is epoxy the right system for a washdown area?
Frequently not. Standard epoxy tolerates moderate heat, but repeated steam cleaning or constant wet service is exactly where it struggles. A polyurethane cement screed handles far higher temperatures and thermal cycling, which is why wet-process factories specify it.
What is the difference between an epoxy coating and an epoxy screed?
A coating is a thin film, typically under a millimetre, applied by roller or squeegee. A screed is a trowel-applied system several millimetres thick with aggregate through it. Coatings protect; screeds rebuild a surface and take far heavier punishment.
Can a floor fail from being used too soon?
Yes, and it is one of the most preventable failures. A coating that has not reached full chemical cure is soft. Forklift traffic, pallet drops or a chemical spill in that window leaves permanent damage even though the installation was correct.
Why is my floor wearing through in traffic lanes?
Either the film was applied too thin for the duty, or the system was under-specified for the traffic. Pick paths and forklift lanes take far more abrasion than open floor, and a specification that averages across the whole area will fail in the lanes first.
What causes pitting or erosion in patches?
Chemical attack beyond what the system is rated for. Every coating has a chemical resistance profile, and something in your process is outside it. The fix is a system matched to the actual chemicals, not a thicker coat of the wrong one.
Do racking legs damage coated floors?
They can. Racking concentrates enormous load into small baseplates, and point loading is a different problem from rolling traffic. Under heavy racking the specification needs to account for compressive load, not just abrasion.
Can a failed factory floor be repaired, or does it all come off?
It depends on whether the coating is still bonded. Isolated damage in a sound floor can be cut out and patched. Where the bond has gone across an area — blistering, sheet peeling, widespread delamination — that section has to be removed and rebuilt.
How much does it cost to fix a failed floor?
More than doing it correctly the first time, because the failed coating has to be removed before anything else happens. Removal is slow, dusty work. It is the single strongest argument for paying properly for preparation up front.
How can I tell if a quote will produce a floor that fails?
Look for what is missing. No moisture testing, no mention of how the slab is prepared, no reference to joints, and no discussion of what your floor actually does day to day. A quote that prices by square metre alone has not engaged with the job.
Do you assess floors you did not install?
Yes. We look at failed industrial floors across Melbourne, identify why it failed, and quote the repair honestly. Sometimes the answer is that a section can be saved, which is a smaller job for us and the right outcome for you.
Get a failed floor assessed properly
We assess industrial floors across Melbourne, including ones we did not install. We tap-test to map the real extent, moisture test the slab, look at what the floor actually endures day to day, and tell you why it failed before quoting anything.
Sometimes the answer is that a section can be saved rather than the whole floor replaced. That is a smaller job for us and the right outcome for you, and we would rather tell you that than sell you a rebuild you do not need.
Call 0451 980 606 or book a free site assessment.
More: factory epoxy flooring, warehouse epoxy flooring, commercial epoxy flooring, commercial kitchen flooring, factory epoxy flooring cost in Melbourne, epoxy flooring for warehouses.
Planning an epoxy floor in Melbourne?
Book a free on-site inspection and get a fixed written quote — no obligation.
