“It’s warrantied” is one of the least informative sentences in commercial construction. Warrantied by whom, for how long, against what, and voided by what? Those four answers determine whether you have real protection or a piece of paper that evaporates the first time you try to use it.
Epoxy and resinous floor warranties are unusual because the failure modes are almost always attributable to something outside the coating itself — the slab was wet, the prep was inadequate, a forklift dropped a die on it, or the sanitation crew switched to a cleaner the topcoat cannot handle. Every one of those has a corresponding exclusion, and that is where warranty claims go to die.
This article explains how the two warranties on a commercial floor actually work, what they typically exclude, and — more usefully — what documentation you should be collecting during the job so that a claim is a straightforward matter rather than a dispute. Nothing here is a description of any specific company’s terms, including ours. Always get the actual warranty documents in writing before you sign, and read them.
There are two warranties, not one
This is the single most important thing to understand, and it is where most owners get caught. A commercial floor carries two separate, independent warranties from two different parties.
The material warranty (from the manufacturer)
The manufacturer warrants that the product, as shipped, conforms to its published specification: correct chemistry, correct mix ratio behavior, free from manufacturing defect. If a batch was formulated wrong and will not cure, that is a material claim.
What a material warranty generally does not cover is anything to do with how the product was applied or what it was applied to. The manufacturer never saw your slab. Their data sheet states required substrate conditions, surface profile, moisture limits, temperature and dew point windows, and recoat intervals. If those were not met, the product was used outside its specification and the warranty does not attach.
Manufacturer warranties are usually limited to replacement of material, not labor. That distinction matters enormously: material is often a minority of the installed cost. A material-only warranty on a failed 12,000 square foot floor pays for the buckets, not for the demolition, the prep, or the crew.
The workmanship warranty (from the installer)
The installer warrants that the floor was installed correctly: prepped to the required profile, applied at the specified thickness, within the specified conditions, with proper cure. A workmanship warranty typically covers labor and material to correct a defective installation.
Workmanship warranties are usually shorter than material warranties and — this is the practical point — they are only as good as the company standing behind them. A ten-year workmanship warranty from a contractor with two years of history is a ten-year warranty in name only. Longevity, self-performing crews, and a local presence are more meaningful than the number on the certificate.
Extended or joint warranties
On larger projects some manufacturers offer an extended or joint warranty covering material and labor together, usually conditioned on the installer being an approved applicator, the system being installed exactly per spec, and a manufacturer’s representative inspecting or signing off on the substrate. These are the strongest form of coverage available and they come with the strictest documentation requirements. If you want one, ask during bidding, because the conditions have to be met during the job, not after.
What warranties actually cover
| Condition | Typically a material claim | Typically a workmanship claim | Typically excluded |
|---|---|---|---|
| Product will not cure or cures soft | Yes, if conditions were met | Yes, if mixed or applied wrong | If applied below dew point or out of temp range |
| Delamination from the slab | Rarely | Yes, if prep was inadequate | Yes, if caused by moisture where testing was declined |
| Blistering / osmotic bubbling | Rarely | Sometimes | Commonly excluded as moisture-related |
| Premature wear-through in traffic lanes | Rarely | Yes, if under-spec thickness | If traffic exceeds the design load |
| Chemical staining or softening | Yes, if within the listed resistance | Rarely | Yes, if the chemical is not on the approved list |
| Impact damage, gouges, chips | No | No | Yes — abuse and impact are standard exclusions |
| Cracks reflecting through from the slab | No | Sometimes, if joints were mistreated | Commonly excluded as substrate movement |
| Color fade or ambering | Sometimes | No | Yes, for non-UV-stable systems in UV exposure |
| Loss of gloss from scrubbing | No | No | Yes — normal wear |
Read that table alongside the exclusions list in your actual warranty document, because terms vary meaningfully between manufacturers and between installers.
The four things that most commonly void coverage
1. Moisture-related failure where testing was declined
This is the big one. Moisture vapor emission from a concrete slab drives hydrostatic pressure under a coating and lifts it off. It is the most common cause of resinous floor failure and it is the most commonly excluded condition.
The exclusion usually reads something like: moisture-related failure is not covered unless slab moisture testing was performed and results were within the system’s stated limits, or an approved moisture-mitigating primer was installed. That means declining a few hundred dollars of testing can forfeit coverage on the entire floor.
The tests to ask for by name are ASTM F1869 (anhydrous calcium chloride, measuring moisture vapor emission rate in pounds per 1,000 square feet per 24 hours) and ASTM F2170 (in-situ relative humidity probes drilled into the slab). RH probes are generally considered more representative of what a slab will do over time. Whichever is used, you want the results in writing, dated, with test locations noted.
2. Improper surface preparation
Every system data sheet specifies a required surface profile, usually expressed as a CSP number on the ICRI scale. If the floor was not mechanically profiled to that standard, the coating never had a mechanical key to bond to, and the manufacturer will say — correctly — that their product was used outside its specification.
The owner rarely knows this happened. Prep is invisible under a finished floor. This is why documenting the prep method and photographing the slab after profiling and before priming is worth the fifteen minutes it takes. The relevant background is in diamond grinding versus shot blasting and in why epoxy floors fail.
3. Improper cleaning chemicals and maintenance
This one voids more coverage than owners expect, and it is entirely self-inflicted. Warranties are conditioned on maintaining the floor per the manufacturer’s written procedure. Common violators:
- Aggressive low-pH or high-pH degreasers outside the topcoat’s chemical resistance list
- Solvent-based strippers used to remove built-up soil
- Bleach or quaternary sanitizers at concentrations above what was specified
- Abrasive pads or brushes that abrade the topcoat instead of cleaning it
- Steam or hot water above the system’s thermal rating on a coating not designed for thermal shock
- Letting spills of listed-incompatible chemicals sit rather than cleaning them promptly
Get the approved chemical list at closeout, laminate it, and give it to whoever runs sanitation. If your existing chemistry is not on the list, that is a conversation to have during bidding — the topcoat spec may need to change. A urethane topcoat and a standard epoxy topcoat have meaningfully different chemical and abrasion profiles.
4. Alterations, abuse, and changed use
Anything that changes the floor after installation generally terminates coverage for the affected area: core drilling, anchoring equipment through the coating, patching by another contractor, applying a different topcoat or a floor wax over it, or adding striping with an incompatible paint.
Abuse exclusions cover impact and point loading beyond the design condition — dropped tooling, steel-wheeled carts on a system specified for pneumatic tires, tracked equipment. Changed use is subtler: a coating specified for a dry assembly area and later subjected to daily wash-down is being asked to do a job it was never sold for. If your process changes, tell the installer; a topcoat upgrade is far cheaper than a failure.
Reading the fine print: seven clauses to check
- Term and start date. Does the clock start at substantial completion or at final payment? Are different components covered for different periods — for example, topcoat wear versus adhesion?
- Remedy. Repair, replace, or refund? Material only, or material and labor? Prorated by year or full value?
- Prorating. Many long warranties decline in value annually. A “15-year” warranty that pays 20 percent in year eight is a different product than it sounds.
- Transferability. If you sell or lease the building, does coverage follow? Often it does not.
- Notice period. Many warranties require written notice within a short window — sometimes 30 days — of discovering a defect. Miss it and the claim is barred.
- Inspection rights. The warrantor almost always has the right to inspect before any repair. Repairing it yourself first usually voids the claim.
- Exclusion of consequential damages. Essentially universal. Your lost production during a repair is not covered by anyone. This is another reason downtime belongs in your original decision math, as covered in our lifetime cost comparison of epoxy, polished concrete, and tile.
The documentation that protects you
A warranty claim is an evidentiary exercise. The owner who can produce dated test results, prep records, and batch numbers gets a different response than the owner who can produce a photo of a peeling floor.
Require this closeout package in the contract, not as a favor afterward:
- Moisture test results — method, date, locations, readings
- Prep method used and profile achieved, with photos of the profiled slab before priming
- Product names, data sheets, and batch numbers for every layer
- Application dates with ambient temperature, slab temperature, relative humidity, and dew point
- Material consumption versus the specified coverage rate, which is your proof of thickness
- Both warranty documents, signed and dated
- The written maintenance procedure and approved chemical list
Then keep your own records during service: cleaning chemicals and frequency, any spills and how they were addressed, any repairs by others, and any change in how the space is used. Ten minutes a quarter in a shared folder.
How to raise a claim properly
If something goes wrong, sequence matters:
- Photograph the condition immediately, with something in frame for scale, and note the date.
- Notify the installer in writing right away — email is fine — to satisfy the notice period.
- Do not repair, patch, or clean the affected area beyond what safety requires. You will destroy the evidence and likely the claim.
- Pull your closeout package and your maintenance log.
- Allow the inspection. Expect adhesion testing or a core sample; that is how the cause gets determined.
- Ask for the finding in writing, whatever it concludes.
Sometimes the honest finding is that the failure is not covered — the slab moved, or the process changed, or a piece of equipment hit it. A contractor who tells you that plainly and quotes a repair is behaving correctly. The ones to worry about are the ones who stop answering the phone.
What to ask before you sign anything
During bidding, request both warranty documents in full — not a summary, not a bullet in the proposal. Read the exclusions first. Then ask directly: what would void this, and what do you need from me during the job to keep it valid? Any contractor who cannot answer that quickly has not read their own warranty.
These questions overlap heavily with the broader vetting process outlined in how to vet a commercial flooring contractor, and warranty terms should appear as a line item when you are reading a flooring quote and evaluating the scope of work. Environments with regulatory exposure — healthcare, life sciences, food processing — should also confirm that the warranty contemplates the sanitizers and wash-down cycles the facility actually uses.
Frequently Asked Questions
How long should a commercial epoxy floor warranty last?
Terms vary widely by system and by installer, and a longer term is not automatically better — a heavily prorated long warranty can be worth less than a shorter full-value one. Compare remedy, prorating, and exclusions rather than the headline number, and ask each bidder for their actual documents.
Does the warranty cover labor to remove and replace a failed floor?
Often not. Manufacturer warranties are frequently limited to replacement material. Labor typically comes from the installer’s workmanship warranty, if one exists and if the failure falls inside it. Confirm in writing which party covers labor, because on a failed floor labor is the large number.
If I skip moisture testing to save money, what am I risking?
Coverage for the most likely failure mode. Moisture-related delamination is commonly excluded outright when testing was not performed. The testing cost is trivial next to the cost of removing and reinstalling a floor, and the results also tell the contractor whether a moisture-mitigating primer is required.
Can my cleaning crew really void the warranty?
Yes, and it happens regularly. Using chemicals outside the approved list, aggressive pads, or high-temperature wash-down on a system not rated for it are all standard exclusions. Get the approved maintenance procedure at closeout and make sure sanitation actually has it.
What if the contractor blames the manufacturer and the manufacturer blames the contractor?
That standoff is the strongest argument for hiring a contractor who self-performs the work and has a direct, long-standing relationship with the manufacturer of the systems they install. It is also the argument for keeping your own documentation — test results, prep photos, and coverage records usually settle the question of cause quickly.
Does a warranty transfer if I sell the building?
Frequently not, or only with written consent and sometimes a fee. If a sale or a lease turnover is plausible within the warranty term, ask about transferability before signing rather than during due diligence.
What does National Epoxy’s warranty cover?
We provide warranty terms in writing with every proposal, and we would rather walk you through the exclusions before the job than after. Because we install American-made NexGen Polymers systems and self-perform every step from prep through topcoat, prep and application accountability sit with the same crew that stands behind the floor.
Ask for the terms in writing — from everyone
The best warranty outcome is the one you never use, and that comes from testing the slab, prepping it correctly, specifying a system that matches the real conditions, and maintaining it with chemicals it can handle. Coverage is a backstop, not a plan.
National Epoxy has installed commercial and industrial floors across Chicagoland, Northwest Indiana, and Southeast Wisconsin for over 30 years. If you want a walkthrough of what your floor needs, what would void coverage in your specific environment, and what documentation you should be requiring from any contractor, get in touch through our contact page or call (630) 919-5000.