Is polished concrete or a coating the right floor for a shop?
Concrete polishing grinds the existing slab down and hardens it, so the finished floor is the concrete you already own. A coating is a separate film bonded over that concrete. Polishing gives you a surface that cannot peel and asks almost nothing of you. A coating gives you chemical resistance, traction and striping. What lands on the floor settles it.
The call follows the work in the room, not the budget line or the look. A dry distribution aisle and a brewery floor are different problems, and a bid that hands both the same system was written off square footage.
The part that surprises shop owners is the price. A polished floor looks like bare concrete, so it reads as the cheap option, and it is not. Running a slab up through the grit sequence takes the same crew and the same machines that prep a floor for a coating, only for longer.
Which floor holds up better under forklifts and pallet jacks?
Under steady wheel traffic, polished concrete wins on wear. There is no film to break the bond of, no edge to peel back, and a densified slab under forklifts stays serviceable for decades. A coating can match it, but only when the system is specified for the traffic it actually gets rather than for the square footage on the bid.
Wheel damage on a coated floor shows up in predictable places. Where pallet jacks pivot, hard rubber scuffs the top coat first. Where a forklift turns the same corner forty times a day, a thin film goes gray, then bare. A high-build system with a chemical-resistant top coat takes that turn. A roll-on kit off a big-box shelf wears through at the pivots inside a season.
The one wheel problem polishing does not solve is the slab underneath. Grinding exposes every crack, patch and cold joint the concrete already has and then polishes them to a shine. If the floor is a map of repairs, polishing makes it a shiny map of repairs, and a broadcast coating is the finish that hides it.
Which floor can you spill fuel, solvents and hot washdown on?
A coating stops liquids at the surface. Hydraulic fluid, diesel, brake cleaner and de-icer sit on a proper film until somebody mops them. A polished slab is concrete, hardened but still concrete, and the guard on it is a maintenance product rather than a membrane. Oil darkens it, and battery acid, food acids and brewery sugars etch into it.
That is the line that decides most shops, and you can usually read it off the slab. If the concrete carries nothing worse than tire marks and dust, polishing is the cheaper floor to own. If there are dark rings under a lift or a hose bib in the corner, the film pays for itself the first time somebody drops a drum.
Hot washdown is its own category. Water above about tap temperature on a coated floor is a thermal shock problem, not a chemical one, because the slab and the film expand at different rates. Urethane-cement is built for that cycle, which is why brewery and food-prep rooms get it instead of a standard epoxy, and why neither of those rooms is a polishing candidate.
Which floor is safer when the bay gets wet?
Polished concrete is slick when wet. That is its honest weakness, and no grit level fixes it. A coating can be built to whatever traction the zone needs by broadcasting aggregate into the top coat, so a wash bay holds a boot while the swept aisle twenty feet away stays smooth and easy to sweep.
Slip is worth zoning rather than deciding building-wide. The same shop often wants texture at the door and under the lift, and a smooth surface where pallets slide and rolling chairs travel. A spec that names traction by area is a sign somebody walked the building.
How many passes, and how many days, does each one take?
Downtime is where the two paths separate most. Polishing has no cure window at the end, so the floor takes traffic the moment the last pass comes off, but there are several passes and each one is slow. A standard epoxy build runs the other way. Fast application, then a wait between coats and a longer wait before wheels. Count the hours the bay is dark, not the hours the crew is there.
A polyaspartic floor coating buys that schedule back, which is why a shop that cannot close pays its premium. Zoning is the other lever, and it works on a polish as well as on a coating: half the building gets finished while the other half keeps earning, then the crew comes back for the rest.
Polishing runs quiet and dust-controlled, and it runs long. On a warehouse the machine time is rarely the expensive part of that schedule. Moving the pallet racking off the slab is.
What does the strip of floor inside the bay door do to each one?
The strip of floor inside an overhead door is the harshest ground in the building. Snow comes in on tires, melts, refreezes overnight against the slab, and the de-icer that rode in with it stays behind as a salt crust. That strip fails first on every floor, coated or not, and both systems have to be specified for it.
On a coating, the failure is at the edge. Meltwater tracks to the perimeter, a cold slab underneath slows the cure of anything installed in the wrong month, and the film starts lifting at the door line. On a polished floor, chloride sits directly on the concrete, and chloride and concrete have never gotten along. The densifier helps. It is not a membrane.
Neither system escapes that strip, and on both it belongs in the estimate as its own line: a coved or feathered edge on a coated floor, a guard on a polished one, and a moisture reading before anything starts on a slab that sits on grade.
What do the two floors cost over ten years?
A commercial coating runs $5 - $12 by spec per square foot installed, and a one-day polyaspartic system runs $9 - $13 per square foot. A full professional system at 1,000 square feet lands around $7,000 - $11,000. Polished concrete is priced at the measure instead of from a table, because the number depends on how much concrete has to come off and what the slab hides.
Ten-year math rarely matches day-one math. A coated floor has a mid-life event in it: a sound floor gets a recoat at $3 - $5 per sq ft, and a floor that is lifting has to be ground off before anything new goes down, which is the expensive version. A polished floor has no recoat. It gets re-burnished and re-guarded on a cleaning schedule, and the second decade costs about what the first one did.
Two line items move a commercial number more than the system choice does. Moisture mitigation on a slab that meters wet runs $1.50 - $3 per sq ft, and it is not optional on damp concrete. A small room quoted alone hits the minimum job of $1,200, which is why an office or a parts room is worth adding to the same mobilization as the main floor. Full ranges by system are on the page covering what a commercial floor costs.
Which bays get polished, and which get a film?
Read the answer off the hazard, not off the room. A slab that only takes wheels and dust can go bare, ground and hardened. Anything that spills, etches, freezes or has to hold a boot under water needs a film built for that load. Most working buildings turn out to want both, split along a line the measure draws on the floor.
| What the floor sees | The honest call |
|---|---|
| Wheels and dust, nothing spilled | Polished concrete |
| Fuel, hydraulic fluid, solvents | High-build epoxy with a chemical-resistant top coat |
| Hot washdown, food and brewing acids | Urethane-cement |
| Standing water where people walk | Aggregate broadcast into the top coat |
| A slab already mapped with cracks and patches | A broadcast coating, which hides what polishing magnifies |
| De-icer tracked in on tires | Either one, detailed at the door as its own line |
| A shop that cannot go dark for days | Polyaspartic, installed in zones |
Most Kootenai County buildings have more than one of those rows under one roof: a dry racking aisle, a wet bay, a corner customers see. A measure that walks the building zone by zone usually comes back recommending polish in one and a coating in the next, and the commercial epoxy flooring page covers how that split gets spec’d and scheduled.