Types of Concrete Curbs
The main types of curbs are barrier curb, mountable (rolled) curb, curb and gutter, mow curb, landscape curbing, and parking curbs. Each one does a different job. A barrier curb keeps cars on the road, a mountable curb lets you drive over it, a mow curb hides in your grass, and a parking curb stops a tire before it hits the wall. Height is the fastest way to tell them apart: street curbs stand about 6 inches, mountable curbs sit closer to 4 inches with a sloped face, and mow strips are poured flush with the soil.
Here is what each type is, where it belongs, and how to pick the right one. When you know the type and the length, you can run the numbers in the concrete curb calculator to see how much concrete you need.
Barrier curb (vertical curb)
This is the standard street curb. A barrier curb has a tall, nearly vertical face, usually 6 inches above the gutter line, sometimes up to 8 inches on arterial roads. The steep face is the point. It physically blocks vehicles from leaving the pavement, protects sidewalks and lawns, and channels stormwater to the inlets.
You see barrier curbs along collector and arterial streets, around parking lot islands, and anywhere traffic needs a firm edge. The tradeoff is that a 6-inch vertical face is unfriendly to snow plows and hard to drive over on purpose, which is why residential streets often use a lower profile instead.
Mountable (rolled) curb
A mountable curb, also called a rolled or roll-over curb, has a low, rounded face you can drive across without scraping. Height is usually around 4 inches with a gentle slope, so a car can roll over it anywhere along its length. That is exactly why subdivisions like it: a homeowner can put a driveway apron wherever they want without cutting the curb, and the developer saves on curb cuts.
The downside is drainage and containment. A rolled curb holds back less water and does less to stop a vehicle that jumps the edge. Contractors on the engineering forum Eng-Tips point out that rolled curbs also let people park with a wheel up on the grass, which barrier curbs discourage. Calichi sums up the split simply: barrier curbs are for control, mountable curbs are for access.
Curb and gutter
Curb and gutter is a curb poured together with a flat gutter pan in one continuous section. The gutter is the shallow trough at the base that carries water along the street to a drain. Combining the two in a single pour makes a stronger, better-draining edge than a curb sitting on its own, which is why most municipal streets and larger parking lots spec it.
Curb and gutter comes in both barrier and mountable profiles, so it is really a construction method as much as a shape. Because the gutter pan adds width and concrete volume, it is worth estimating on its own. The curb and gutter guide covers the profiles, standard dimensions, and how to figure the material.
Mow curb (mowing strip)
A mow curb, or mowing strip, is a narrow band of concrete poured flush with the ground between a lawn and a bed, fence, or wall. It is not really a "curb" in the traffic sense at all. It sits at grass height, usually 3 to 4 inches wide, so the wheel of a mower can ride along it and cut the edge clean. No more trimming by hand, and no grass creeping into the flower bed.
Because a mow strip is flush and shallow, it uses very little concrete and needs almost no forming height. It is one of the easier concrete jobs a homeowner can take on, and it pays off every time you mow.
Landscape and decorative curbing
Landscape curbing is the low, continuous concrete border you see edging flower beds, trees, and walkways in yards. It is often extruded on site by a machine that lays a rounded or slant-faced bead of concrete in one pass, and it can be colored or stamped to look like stone or brick. Height is typically 4 to 6 inches above grade with a mowable back edge.
This is the decorative cousin of the mow curb. It defines beds, keeps mulch in and grass out, and adds a finished look. If that is the project you have in mind, the landscape edging guide walks through machine-extruded versus hand-formed curbing and what each costs.
Parking curbs and wheel stops
Parking curbs, also called wheel stops, parking blocks, or concrete curb stops, are short precast blocks anchored at the head of a parking space. They stop a tire before the car rolls too far into a walkway, wall, or the next stall. Unlike the curbs above, these are not continuous. They are individual units you bolt or pin to the pavement.
Standard precast blocks run about 6 feet long, 6 to 8 inches deep, and 4 to 6 inches tall, per the dimensions listed at Dimensions.com. A 6-foot concrete block weighs a couple hundred pounds, which is what keeps it in place. They are usually painted yellow or white and pinned with steel spikes or rebar through cast-in holes. Because they are precast and dropped in, they install fast and are easy to replace when a plow catches one.
Precast versus cast-in-place curbs
Curbs are made two ways, and the method decides how the job runs.
Cast-in-place curb is formed and poured on site. Crews set forms, pour concrete, shape the profile, and strip the forms once it sets. This is how continuous street curb, curb and gutter, and most residential curbs get built. It gives you a monolithic run with no joints between units and lets you follow curves and grade changes exactly. It takes more labor and time on site.
Precast curb is cast at a plant, cured, then trucked in and set in place. Parking blocks and wheel stops are the common precast example, but you can also get precast curb sections for repairs and modular installs. Precast wins on speed and consistent quality, since it cures in a controlled setting. It loses flexibility, because you are placing fixed units instead of pouring to fit. As a rule, continuous runs get cast in place and discrete stops get precast.
Driveway curbs and curb cuts
A driveway curb is where a private drive meets the public street. If your street already has a mountable curb, a car can usually roll right over it. If it has a barrier curb, you need a curb cut: the curb is lowered or removed and a sloped apron is poured so vehicles can cross without scraping.
Here is the part people miss. Cutting or lowering a public curb almost always needs a permit from the city, because that curb and the strip behind it are in the public right of way. Cities like Minneapolis require a curb cut permit and a licensed contractor for the work, and Bob Vila notes the apron section over that right of way often has to meet the city's own spec. Do not saw into a street curb on your own. Call the city first, then price the apron.
ADA curb ramps
Where a sidewalk meets a street crossing, a curb ramp bridges the height difference so wheelchairs, strollers, and carts can get up and down. These are federally regulated, and the numbers are specific. Per the U.S. Access Board, a curb ramp run has a 1:12 maximum running slope (about 8.3 percent), a 1:48 maximum cross slope, and a 36-inch minimum width. A level top landing at least 36 inches long is required so a wheelchair can turn.
Many ramps also carry detectable warnings, the raised "truncated domes" you feel underfoot at a crossing. The Access Board specifies domes 0.9 to 1.4 inches at the base and 0.2 inch tall. They are mandatory at transit facilities and federally funded projects, though not at every location. If you are building a ramp in the public right of way, treat the local DOT and ADA standard as the spec, not a suggestion.
Quick comparison of curb types
| Curb type | Typical height | Drive over it? | Main use |
|---|---|---|---|
| Barrier (vertical) | 6 in (up to 8) | No | Streets, lot islands, containment |
| Mountable (rolled) | ~4 in, sloped | Yes | Subdivisions, driveway access |
| Curb and gutter | 4 to 6 in + gutter pan | Depends on profile | Street drainage, parking lots |
| Mow curb / mowing strip | Flush, 3 to 4 in wide | N/A | Lawn-to-bed border |
| Landscape curbing | 4 to 6 in | No | Decorative bed edging |
| Parking curb / wheel stop | 4 to 6 in tall, ~6 ft long | No | Stops tires in a stall |
| ADA curb ramp | Ramps down to flush | Yes (by design) | Sidewalk crossings |
Ready to price a job? Head back to the concrete curb hub for the full silo, run your numbers in the concrete curb calculator, or if you are patching an existing curb, see the curb repair guide.
Sources
- U.S. Access Board, Chapter 4: Ramps and Curb Ramps
- Dimensions.com, Curb / Parking Block
- Calichi, Curb and Gutter Types: Rolled, Barrier, and Mountable
- Bob Vila, All You Need to Know About the Driveway Apron
- City of Minneapolis, Curb Cuts for Residential Properties
- Eng-Tips, Rollover Curb vs. Barrier Curb
Frequently asked questions
What is the difference between a barrier curb and a mountable curb?
A barrier curb has a tall vertical face (about 6 inches) that blocks vehicles and is meant to be hard to cross. A mountable, or rolled, curb is lower with a sloped face so a car can drive over it anywhere. Barrier curbs are for control and drainage, mountable curbs are for easy access.
What is a mow curb?
A mow curb, or mowing strip, is a narrow band of concrete poured flush with the ground between a lawn and a bed or fence. The mower wheel rides along it so you get a clean edge without hand trimming. It sits at grass level, so it is not a traffic curb.
Are parking curbs and wheel stops the same thing?
Yes. Parking curb, wheel stop, parking block, and concrete curb stop all mean the same short precast block at the head of a parking space. It stops the tire before the car rolls too far. Standard units are about 6 feet long and 6 inches tall.
Do I need a permit to cut a curb for a new driveway?
Almost always, yes. The street curb sits in the public right of way, so lowering or cutting it usually requires a curb cut permit from the city and, in many places, a licensed contractor. Check with your local public works or streets department before any work starts.
Should I use precast or cast-in-place curb?
Use cast-in-place for continuous runs like street curb, curb and gutter, or a driveway apron, because it pours as one monolithic piece and follows curves and grade. Use precast for discrete units like parking blocks, where speed and consistent quality matter more than a custom fit.
How tall is a standard street curb?
Most street curbs stand about 6 inches above the gutter, and some arterial roads go up to 8 inches. Residential streets often use a lower mountable curb closer to 4 inches so residents can drive over it into their driveways.