CHARLOTTE INDUSTRIAL FLOORING GUIDE

Epoxy Flooring for Textile Mills and Converted Mill Buildings: Old Slabs, Lint and Hidden Conditions

October 26, 2026
9 min read
by V&V Epoxy Solutions

Mill buildings are a familiar sight across the Carolinas. Some still make textiles, and many have been converted to workshops, light manufacturing, studios and offices. All of them were built long before anyone planned for a resinous floor, and often nobody has a drawing of what is under the surface. This guide covers what to find out first, which floors can be coated and which can’t, and how lint, loads and historic status change the plan.

Quick takeaways

A mill floor is a patchwork of timber, old concrete and layers of repair, so the first job is finding out what is really there.
Test before anyone quotes: soundness, moisture, oil and old coatings, flooring and adhesives, with older materials checked by a qualified professional before they are ground.
A coating follows the floor beneath it and adds no structural capacity, so worn, uneven or heavily loaded floors need other answers first.
Wood plank floors move and flex, so a rigid coating is not automatically a fit, and sometimes the honest answer is not to coat.
Lint is a safety-plan matter, and a historic building can need approval before an original floor is changed.

Why Is a Mill Building Floor Different?

A modern plant slab is poured to a plan. A mill floor is the sum of everything that has happened to it. Some mill floors are heavy timber and plank, some are concrete placed long ago, and most have been patched, leveled, painted and sealed many times by people who left no record. Machines have been bolted down and moved, oil has soaked in, and the floor has cracked and settled in places.

Textile work adds its own conditions: fine fiber and lint in the air, lubricants from machinery and, in some processes, controlled humidity. And these floors are rarely flat. A coating follows the surface beneath it rather than correcting it, so a worn or uneven floor stays worn or uneven unless it is repaired or leveled first.

That is why the first job isn’t choosing a product. It is finding out what the floor actually is.

What Should You Find Out Before Anyone Quotes?

Walk every area and ask four questions.

Is it sound? Tap and sound the floor for hollow areas, loose toppings and patches that have let go, and note cracks, spalls and settlement. Our guide to joint and spall repair [/blog/industrial-floor-joint-spall-repair] covers what can be repaired, and a crack that is still moving is a question for a structural engineer.

Is it dry? Older slabs often have no vapor barrier beneath them, so moisture can rise through the concrete, and humidified rooms or damp lower levels make that more likely. Test the slab rather than guessing, as we explain in our guide to why coatings peel [/blog/why-epoxy-floors-peel-charlotte], because a standard coating can fail over a slab that passes moisture. The results decide whether the system needs a moisture-mitigating step or the source has to be dealt with first.

Is it contaminated? Machine oil can soak deep into old concrete. Our guide to industrial floor preparation [/blog/industrial-concrete-floor-preparation-shot-blasting-grinding] explains why oil is assessed rather than assumed away.

What is on top? Old paint, sealers, coatings, flooring and adhesives. In an older building, some of these may need testing by a qualified professional before they are ground or removed, and the result should be in hand before work begins.

Photograph and map everything, because the map becomes the scope.

Can You Coat Wood, Brick or Topped Floors?

It depends on the floor, and sometimes the honest answer is no.

Wood plank. Wood moves with humidity and flexes under load, and a rigid coating can crack or lift when the boards beneath it move. Some wood floors are better refinished than coated, so we would look at the floor before recommending anything, and a flooring specialist may be the better call.

Brick and pavers. Their joints and uneven surface need assessing, and they usually need filling or leveling before a thin coating can perform.

Concrete toppings. A thick topping or leveling layer can be well bonded or hollow, and sounding tells you which. Loose areas have to come out before anything goes on.

One limit applies to every floor type: a coating adds no structural capacity. What an upper floor or an old slab can carry under heavy machines and stock is a question for a structural engineer, and an old floor shouldn’t be assumed to carry modern loads.

How Do Lint, Humidity and Oil Change the Specification?

Lint and fiber dust. Fine fiber settles everywhere, can make a hard floor slippery and can be combustible. Managing that risk is a safety-plan matter for your safety professional, your insurer and the authority that inspects your facility, and a coating doesn’t change it. What a floor can do is support housekeeping: a sealed surface with filled joints is easier to see and clean than porous, patched concrete, as we explain in our guide to woodworking plant floors [/blog/epoxy-flooring-woodworking-cabinet-furniture-plants], where fine dust raises the same questions. Texture adds grip but also holds more lint, so balance the two by zone and test samples with your own lint and your crew’s footwear.

Humidity. If some rooms are kept humid for your process, tell the installer, because moisture in the air and in the slab affects testing and the system. Our guide to why garage floors sweat [/blog/why-garage-floor-sweats-humidity-charlotte] explains how to tell condensation from moisture coming through the slab, and the same distinction applies here.

Oil and lubricants. Give the installer the list of oils, lubricants and cleaners you use, so the system is specified against them and not against a generic “chemical resistant” label. Machines bolted into an old floor are worked around carefully, as our guide to manufacturing plant flooring [/blog/epoxy-flooring-manufacturing-plants] describes.

What Changes in a Historic Building or a Conversion?

Approvals. If the building is historic, or the project uses preservation incentives, changing an original floor may need approval from the relevant preservation authority or your preservation consultant. Ask early and in writing, and keep the answer with the project records. Whether approval is needed isn’t a question a flooring contractor can answer.

Reversibility. A bonded coating is durable by design, and taking one off later means grinding. If you may want to keep an original floor or return to it, say so before the decision, and treat “don’t coat” as a legitimate result.

Sequence. In a conversion, a coating usually goes down late, after the heavy trades and overhead work are finished, and then has to be protected until the other trades are done. Agree with the general contractor who protects the floor, which trades may enter during cure and how grinding dust is contained. If you are a tenant in a converted mill, our guide to leased commercial spaces [/blog/epoxy-flooring-leased-commercial-space-tenants-landlords] covers the landlord approvals that come first.

In a mill that is still running, the work is phased by room, line or bay instead, with lint and dust control planned with your safety officer. Either way, the floor needs time to cure before machines, carts and people return, and how long depends on the system and conditions, so we confirm it after seeing the slab and plan each area’s return.

Get your mill floor assessed before it's priced

Request a free, no-obligation walkthrough and industrial quote from V&V Epoxy Solutions in Charlotte, Monroe and the surrounding areas — we’ll walk the building with you, tell you plainly which floors can be coated and which shouldn’t be, and plan the work around your production or project schedule.

Frequently Asked Questions

Can you coat the floors in an old textile mill?

Often, where the floor is sound concrete. Old floors vary so much that we assess each area on site: soundness, moisture, oil and what is on top decide what is possible, and some floors, wood plank for one, may be better left alone.

Can you put epoxy over an old wood plank floor?

Usually it isn’t the best choice. Wood moves with humidity and flexes under load, and a rigid coating can crack or lift when the boards move. A flooring specialist can advise on refinishing, and we’ll tell you plainly if a coating isn’t a fit.

Will a coating level an uneven mill floor?

Not by itself. A coating follows the surface beneath it, so a worn or out-of-level floor stays that way unless it is repaired or leveled first. Low spots and damage can be dealt with before coating, and whether the floor must be level is something to settle with the installer on site.

Does a coating strengthen an old upper floor?

No. A coating adds no structural capacity. What an upper floor or an old slab can carry under machines and stock is a question for a structural engineer.

Do we need approval to coat the floor in a historic mill?

Possibly. If the building is historic or uses preservation incentives, changing an original floor may need approval from the relevant preservation authority. Ask your preservation consultant or the authority before the floor is chosen, because a flooring contractor can’t answer it for you.

Can the work happen while the mill is running or the conversion is under way?

Often. In an operating mill the work is phased by room, line or bay, with lint and dust control planned with your safety officer. In a conversion, the coating usually goes down late and is protected afterward. How long each area needs before it returns to service is confirmed after we see the slab.

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