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Concrete leveling vs overlay comes down to one question: is the problem the slab’s height and flatness, or its surface? Leveling fixes a slab that sank, or one that’s more than 1/4 inch out over 10 feet. An overlay puts a new face on a slab that’s already sound and flat. Overlays run $4.48 to $10.44 a square foot with us. Get the order wrong and you pay twice: once for the wrong fix, then again for the right one.
Concrete leveling corrects height, slope, and flatness. Concrete overlays add a new wear surface on top of sound concrete. Leveling is the fix. An overlay is the finish, and it protects the slab too. A floor can need one, the other, or both. But an overlay poured over an out-of-flat slab just gives you a nicer-looking version of the same problem.
What is concrete leveling and when do you need it?
“Concrete leveling” covers two different jobs, and bids mix them up all the time. One lifts a sunken slab back up. The other pours a compound on top to make the surface flat.
Lifting a sunken slab
Your walk, your driveway, or a section of floor sank because the ground under it gave way. Our foam slab lifting raises it back up. We drill 5/8-inch holes and pump polyurethane foam under the slab. The foam cures in 15 to 30 minutes and lifts the slab in 1/8-inch steps. Then we patch the holes flush. There’s no tear-out and no new pour. Once the slab is leveled and stable, it can take an overlay, a coating, a polish, or a stain.
Flattening the top with self-leveling concrete
Self-leveling concrete, also called floor flattening, is a pourable compound we pump onto the slab. It runs into the low spots and settles out flat on its own. You need it when the floor isn’t flat enough for what’s going on top.
The floor flatness score, or FF number per ASTM E1155, measures how flat a slab really is. Higher is flatter.
- A score under 25: you can see the dips and humps, and carts roll unevenly. This is common in older Oklahoma commercial buildings, mostly warehouses and stores built before 1990.
- A score of 25 to 35: fine for most commercial use, but not flat enough for thin coatings or tile.
- A score of 50 and up: flat enough for any floor, including epoxy, polished concrete, or luxury vinyl tile.
You can check your own floor without the score. Lay a 10-foot straightedge on it. If a quarter (about 1/16 inch) slides under it anywhere, the floor is close enough for most coatings. If a pencil fits (about 1/4 inch), get it leveled before any coating or overlay goes down. Skip that check, and the coating crew is the one who finds the low spot, usually in the middle of the pour.
Why Oklahoma floors move
Much of central Oklahoma sits on the Permian Red Beds, an expansive clay that swells when it’s wet and shrinks when it’s dry. That pushes slabs up in spring and lets them settle in late summer. A building that was level when it went up can end up 1/2 inch out within 10 to 15 years. We see this all the time in OKC and Tulsa commercial buildings from the 1970s and 1980s.
What is a concrete overlay and when do you need it?
A concrete overlay is a thin layer of cement mix, usually polymer-modified, spread over old concrete to give it a new wear surface. It runs 1/16 inch to 3/8 inch thick. An overlay can be stamped, stained, polished, or left smooth. It covers surface damage like flaking, stains, and old patch marks without tearing out the slab.
You need an overlay when the slab is sound and close to flat, but the surface is beat up or you want a new look. In Oklahoma, we see it most on:
- A store floor with years of tire marks, oil stains, and patches that grinding alone can’t take out
- A warehouse turning into an office or showroom that needs a polished or decorative floor
- An older garage floor where salt and freeze-thaw cycles have flaked the top
An overlay won’t level a floor. It follows every dip and hump, the way a bedsheet follows whatever’s under it. Put a 1/4-inch overlay on a floor that’s 1/2 inch out, and you get a smooth-feeling floor that’s still uneven.
How do concrete leveling and overlays compare side by side?
This table covers the six things that decide which one your floor needs. The numbers are for contractor work with pumped compounds, not store bags or DIY products.
| Factor | Self-leveling concrete | Concrete overlay |
|---|---|---|
| Main job | Correct flatness, slope, and height differences | Renew the wear surface; add a decorative or protective finish |
| Typical cost | Priced per job after we measure | $4.48 to $10.44 per sq ft installed (varies by system) |
| Thickness added | 1/4 inch to 1-1/2 inches per pour | 1/16 inch to 3/8 inch |
| What it fixes | Uneven slabs, low spots, slope, a failed FF score | Surface damage, worn or stained looks, a finish upgrade |
| Timeline | Walkable in 4 to 6 hours; ready to coat in 16 to 24 hours | Varies by type: 24 to 72 hours before foot traffic |
| Limits | Doesn’t fix structural cracks or ground that’s still settling; no decorative finish | Doesn’t fix flatness; cracks if poured over an uneven slab |
When does a floor need both leveling and an overlay?
Lots of commercial remodels in Oklahoma need both. The order matters: level first, then overlay. Do it the other way and the overlay just shows whatever was wrong underneath.
A typical level-then-overlay job goes like this:
- Measure. We map the floor with a digital floor profiler or a 10-foot straightedge. Anything over 1/4 inch in 10 feet means it needs leveling.
- Grind. We grind the old concrete to open it up and take off old coatings, glue, and curing compounds. Both the leveling compound and the overlay need this to stick.
- Pour the leveler. We pump and spread a self-leveling compound, usually gypsum-based or Portland cement-based with polymer added. It fills the low spots and settles out flat. How thick it goes depends on how deep the dips are.
- Let it cure. The leveling layer cures for 16 to 24 hours before the overlay goes on.
- Put on the overlay. Which of the three you pick depends on the finish you want: Basic Concrete Overlay from $4.36 per square foot, Patterned Concrete Overlay from $6.14, or Polished Concrete Overlay from $9.86.
The range above includes setup. A single rate can sit a little under it. The total for a level-plus-overlay job depends on how far out the floor is and which overlay goes on top.
How do you know if self-leveling concrete is enough on its own?
Self-leveling concrete is enough when all you need is a flat floor and looks don’t matter. If epoxy, polyaspartic, tile, or another floor goes on top, leveling alone gives that floor the flat base it needs.
Pick like this:
Leveling only if the floor will be covered by something else (coatings, tile, carpet, LVT) and the concrete is sound but out of flat.
Overlay only if the floor is already flat (within 1/8 inch over 10 feet) but the surface is damaged or you want a new finish.
Both if the floor is uneven and also needs a new decorative or protective surface. This is the most common case in Oklahoma commercial remodels, especially older buildings along I-44 between OKC and Tulsa.
Mixing up the two is the most common reason a remodel budget runs over. It’s an easy mistake, because both show up on a bid as “concrete resurfacing,” and only one of them fixes a slope.
Not sure which your floor needs?
Price an overlay or slab lifting in about 2 minutes. For self-leveling work, we measure the floor first and price it per job.
What does concrete leveling cost in Oklahoma?
In OKC, Tulsa, and the rest of Oklahoma, lifting a sunken slab with foam starts at $9.26 a square foot with us, plus the drive cost, which is our trip out to your site. Self-leveling concrete isn’t in our quote tool yet. We price it per job after we measure, because the depth of the low spots sets how much compound goes down. Three things move that price:
- How far out the floor is. A floor that needs 1/4 inch of fill uses less material than one that needs 1 inch. Material cost climbs almost in step with depth.
- Square footage. On bigger jobs (2,000 sq ft and up), the pump setup and the drive cost spread over more floor, so the price per foot drops.
- Access and prep. A space with people working in it, furniture to move, dust to contain, or pours done in phases costs more than an empty shell.
Replacing a slab means breaking out the old one, hauling it off, and pouring new. In Oklahoma, removing and replacing a slab starts at $7.85 a square foot with us. Leveling a sound slab skips all three steps.
The bottom line: level first, then decide on surface
If the slab is uneven, level it. If the surface is damaged but the slab is flat, overlay it. If it’s both, level first, then overlay. The other order doesn’t hold up.
We’ve been fixing Oklahoma concrete floors since 2004, and every job still starts the same way: a straightedge or a profiler on the actual slab, not a guess from a walkthrough. We’ve measured enough clay-soil floors to know the guess and the reading rarely land on the same number. Level first. Pick the finish second. Call (888) 852-3528 or get your price in 2 minutes.
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