By Lukas Overhaug, Owner, Integrity Concrete Coatings
Published
We install across Northern Illinois, from Rockford and DeKalb to the Fox Valley and the western suburbs. See where we work.
01Read this if you read nothing else
The short answer
Polyurea vs epoxy is really a question about the base coat, the layer that holds a floor onto the concrete. Polyurea is the base coat in our floors: a high-elongation coating that bonds aggressively to prepared concrete and flexes as the slab moves. Epoxy is a two-part resin that cures hard and rigid, often takes two to four days to install, and can yellow in sunlight. We install a polyurea base with a polyaspartic topcoat on most floors, and we install epoxy on some commercial jobs where it suits the space. This page is about the base coat. For the whole system against epoxy, read our polyaspartic vs epoxy comparison, and for the longer version of our reasoning, see why we recommend polyurea over epoxy.
- base coat adhesion, ASTM D4541, concrete failure
- 400+ psi
- to install our whole system
- 1 day
- an epoxy install often takes
- 2 to 4 days
- we install, including below freezing
- Year round
02Two materials, plainly
What polyurea is, and what epoxy is
Polyurea is a two-part coating that cures fast and stays flexible once it has cured. People ask us what polyurea coating is in a floor like ours. It is the first layer: the one that goes onto ground concrete, grips it, and stretches a little when the concrete moves. We use it for adhesion and flexibility, and we leave the wear to the polyaspartic topcoat above it.
Polyurea cure time is one of the questions we hear most. On our installs the base cures fast enough that the base, the flake and the topcoat all go down in one day. The floor then comes back on one schedule, counted from when we finish: walk on it at 24 hours, move small items back at 48, and park at 72.
Epoxy is a two-part resin that cures hard and rigid. It has a longer cure window, which is why an epoxy floor often takes two to four days to install. Many epoxies amber under UV light, and a rigid film has little give when the concrete under it moves. That describes epoxy as a material class, not any one product, and epoxy has a place. The section on when epoxy is the right call says where.
What it is
Polyurea base: Two-part coating that cures fast and stays flexible
Epoxy: Two-part resin that cures hard and rigid
Job in our floors
Polyurea base: The base coat: grip and flexibility
Epoxy: Installed on some commercial jobs
When the slab moves
Polyurea base: High-elongation, stretches with it
Epoxy: Little give, can crack at joints
Install time
Polyurea base: Whole system in one day
Epoxy: Often two to four days
Left: the polyurea base we install. Right: epoxy as a material class.
The stretch test below shows the polyurea coating vs epoxy difference that matters most for a base coat: what happens when the slab moves.
Stretch test
Move the slab and watch the two coatings
Both strips sit on a slab that has not moved yet.
Simplified. Movement is exaggerated so you can see it. High-elongation means the base can stretch before it lets go.
03The number we can stand behind
Adhesion: how hard the base holds on
The owners put the adhesion result plainly. In the ASTM D4541 pull-off test on the product data sheet, our polyurea basecoat held at more than 400 psi, and the concrete substrate failed before the coating released from it.
For a homeowner, that means the bond was stronger than the concrete it was bonded to. When the test pulled hard enough to break something, what broke was the slab itself.
Prep is the other half of it. The base can only grip concrete that has been ground open and cleaned, so every one of our installs starts with diamond grinding and a full vacuum. A coating rolled onto smooth or dirty concrete has far less to hold.
We have no epoxy figure to put beside our result, so there is no side-by-side number here. The result stands on its own.
What the adhesion result means
A dolly is glued to the coating and pulled straight up until something gives.
This is the ASTM D4541 pull-off test. The product data sheet for our polyurea basecoat reports the result. Press Pull to see how it ended.
This is what the test result means. It is not a claim about epoxy; we have no epoxy figure to show beside it.
Not sure what is under your floor now?
We will look at the concrete and the old coating, tell you what will bond and give you a written quote. The assessment is free.
04Where winter decides it
Epoxy vs polyurea when the slab moves
Epoxy vs polyurea can look like a close call on a warm day. The difference shows up in January. A slab in Rockford or DeKalb expands and contracts with the temperature, and water that gets into the concrete freezes and pushes. A rigid film rides on top of that movement with nowhere to go, so it cracks and chips at joints and edges, and once an edge is loose, water gets under it. A high-elongation base stretches with the slab and relaxes again when the slab settles back, so the floor stays in one piece.
A slab with a control joint
Cycles: 0/4
Simplified illustration. Movement is exaggerated so you can see it.
Press Run a winter to watch a rigid film ride on a slab that moves.
Road salt makes it worse. From the first snow until spring, slush and salt drip off every car that pulls into a garage in the Fox Valley, and every chip in a coating is a new edge for that brine to get under.
The calendar matters too. We install year round, including below freezing. Cold can make the coating take longer to cure, and that does not harm the floor. Epoxy generally needs warmer conditions, so an epoxy job often has to wait for them.
05The strip that fails first
Polyurea vs epoxy garage floor: what changes at the door
In a garage, the strip just inside the door is where everything lands at once: sun whenever the door is up, salt and slush all winter, and hot tires every time a car comes home. That strip is where the difference between a polyurea base and an epoxy floor shows first.
On our floors the polyurea is not on its own there. It is the base, under a clear polyaspartic topcoat. The base handles the movement and the grip. The top handles the sun and the tires, and the UV stability at the door comes from that top layer, which is an aliphatic polyurea formulated to stay stable in sunlight.
Warm tires can soften a coating enough for the tread to grip it and pull patches up when the car backs out. That is called hot tire pickup, and it is a common way epoxy fails in a garage. Installed properly, our system resists it. For the floor we recommend first, see our garage floor coatings.
06The honest part
When epoxy is the right call
We do install epoxy. We do it case by case, mostly on commercial jobs where it suits the space. Some commercial spaces are a good fit for it, and we assess that job by job.
For most floors, and for homeowners in particular, we steer people to the polyurea base with a polyaspartic topcoat. The reasons are the ones on this page: it installs in one day, and it moves with a slab that sees Northern Illinois winters.
If you run a business and want to know which one fits your floor, the free assessment is where we work that out. See our commercial floor coating page for the kinds of spaces we coat.
07The distinction that matters
A polyurea base under a polyaspartic top is not a polyurea floor
It is easy to read polyurea vs epoxy as one kind of floor against another. Ours is not a polyurea floor. A polyurea-only floor asks one product to grip, flex and take the wear. Our floor uses polyurea for the first two jobs and polyaspartic for the third, because each is formulated for its own job. That is our reasoning, and the chemistry behind it is on our page about polyaspartic vs polyurea.
Here is what the two layers add up to. The install takes one day. You walk on the floor at 24 hours, bring small items back at 48 and park at 72. With proper maintenance, the floor can last a lifetime. Residential floors under a roof, garages included, carry a lifetime warranty, backed by The Integrity Seal. Patios, pool decks, porches, walkways, garage aprons and commercial floors carry a 3-year warranty with the same coverage.
Want to know what your slab needs? Book a free floor assessment and we will look at the concrete and give you a written quote.
About the author
Lukas Overhaug is an owner of Integrity Concrete Coatings, a family-owned company that has installed concrete floor coatings across Northern Illinois since 2018. He and the crew install the polyurea and polyaspartic system described on this page.
