Concrete Curb Types & Height: Ribbon, Flush & More

A concrete curb is a 4 to 8 inch raised concrete edge poured along the perimeter of a parking lot, drive aisle, or roadway to separate pavement from landscaping, channel stormwater, and protect adjacent surfaces from vehicle intrusion. The American Concrete Institute (ACI 318 Building Code Requirements for Structural Concrete) governs the structural mix design, and the Federal Highway Administration (FHWA Roadside Design Guide) sets the geometric profiles used in commercial parking-lot work. Most commercial curbs use a 3,000 to 4,000 PSI mix with #4 rebar, expansion joints every 10 to 15 feet, and a 24-hour form-removal schedule.

This guide explains the four main concrete curb types, the spec data behind each, and how to choose the right profile for your site.

What Are the Main Types of Concrete Curb?

Four profiles cover almost everything we pour on commercial parking lots. Each has a distinct height, slope, and intended traffic interaction.

Curb Type	Face Height	Top Width	Primary Use	Vehicle Interaction
Barrier curb	6 to 8 inches	6 inches	Perimeter, pedestrian protection	Stops vehicles at the line
Mountable curb	4 inches	12 inches sloped	Drive aisles, fire lanes	Vehicles can drive over at low speed
Ribbon (flush) curb	0 to 2 inches	12 to 18 inches	Drainage channels	No vertical barrier
Integral curb	6 inches	6 inches	Sidewalks, monolithic pours	Same pour as adjacent slab

The Oregon Department of Transportation (ODOT Standard Specification 00759) calls for Class 4000 concrete on commercial curb installs, with a surface tolerance of 1/4 inch over a 10-foot straightedge. This is the spec we follow on every Cojo curb pour, regardless of jurisdiction.

How Is a Concrete Curb Made?

We use one of two methods, and the call shifts cost, schedule, and finished appearance.

Slipform (continuous-pour machine): A walk-behind or ride-on machine such as the Power Curbers 5700-D extrudes a continuous curb at 50 to 100 linear feet per hour. We run a low-slump mix (1 to 2 inch) so the profile holds shape the moment the slipform shoe clears it. Almost every commercial perimeter over 500 linear feet gets built this way. The American Concrete Pavement Association (ACPA Guidelines for Slipform Paving) governs the technique.

Hand-formed (formwork): Wood or steel forms get staked along the layout line. A higher-slump 4 to 5 inch mix is poured by chute, screeded by hand, and finished with a curb edger. Production rate drops to 20 to 30 linear feet per hour, but hand-forming is the only realistic option for tight radii, custom profiles, and short runs under 100 linear feet.

On a 14,000 square foot Salem retail center we curbed in March 2026, the perimeter ran 480 linear feet of 6-inch barrier curb. We slipformed the long straight runs and hand-formed the four corners and the ADA ramp transitions, finishing the entire site in 2.5 days.

When Should You Choose Each Curb Profile?

The right profile depends on what the curb has to do at that location.

Barrier curb (6 to 8 inch face)

This is the default anywhere pedestrians walk next to moving vehicles, around landscape islands that need real physical protection, or along retail storefront frontage. A 6-inch face stops a passenger vehicle at parking-aisle speeds (under 5 mph). The 8-inch heavy-duty version gets specified for truck courts and warehouse aprons under AASHTO H-20 loading per the AASHTO Guide for the Geometric Design of Streets and Highways.

Mountable curb (4 inch face, sloped top)

Pick mountable curb when occasional vehicle override is part of the design: fire lanes (the Oregon State Fire Marshal allows mountable curb to define a fire lane without blocking apparatus access), drive-thru islands, and emergency-access routes. The 1:3 slope on the top face lets a passenger vehicle or fire truck mount the curb without tire damage at speeds under 10 mph.

Ribbon (flush) curb

Ribbon curb earns its keep where you need a hardened drainage channel but not a vertical barrier. Classic application: the edge of a parking lot that drains to a swale or detention basin. Water sheets off the asphalt, hits the ribbon curb's flat surface, and gets channeled to an inlet without ponding. The EPA Stormwater Best Management Practices for Parking Lots treat ribbon curb as part of the conveyance system.

Integral curb

Reach for integral curb when a sidewalk or slab borders the curb run and you want a single monolithic pour. Curb and adjacent flatwork share the same concrete, the same control joints, and the same finish schedule. It costs more per linear foot than separate curb-then-sidewalk pours, but it eliminates the cold joint that tends to fail first under freeze-thaw.

How Long Does a Concrete Curb Last?

A properly installed commercial concrete curb lasts 20 to 30 years before needing major rehabilitation, with annual sealing extending service life by 5 to 7 additional years. The variables that compress that range:

• Freeze-thaw cycles: Oregon's I-5 corridor sees 30 to 50 freeze-thaw cycles per year. The USACE TM 5-822-7 Standard Practice for Concrete Pavements recommends air-entrained concrete (5 to 7 percent) for any curb in this climate.
• De-icer exposure: Curb adjacent to traffic lanes that get salted will scale and spall faster than perimeter curb. A penetrating sealer applied every 3 to 5 years is standard maintenance.
• Vehicle impact: A curb located within 12 inches of an angled parking stall takes 3 to 5 times the impact load of a perimeter curb. Spec for impact: 4,000 PSI mix and #4 rebar continuous.

Concrete Curb vs Other Curb Materials

Material	Cost per Linear Foot	Service Life	Best Application
Concrete	$10 to $20 installed	20 to 30 years	Commercial perimeter, drive aisles
Asphalt curb	$5 to $12 installed	8 to 12 years	Budget-driven re-grade, temporary lots
Granite curb	$40 to $80 installed	100+ years	High-end retail, historic districts
Extruded asphalt	$4 to $8 installed	5 to 10 years	Internal drive aisles only

For a deep dive on the trade-off, see our guide to concrete curb cost per linear foot and the mountable curb vs barrier curb decision matrix. Once your curb is poured, periodic painting keeps the stripes legible — see our asphalt paving services for related parking-lot maintenance.

What Permits and Codes Apply?

Commercial curb installation triggers permit review in most Oregon jurisdictions. The three most common reviews:

1. Site Development Permit (city level): The site plan including curb-cut locations, ADA ramps, and drainage must be approved before pour day. Portland Bureau of Development Services, Salem Public Works, and Eugene Building & Permit Services all require this.
2. ADA Compliance Review: Any curb adjacent to an accessible route must meet ADA Standards for Accessible Design Section 405 — 1:12 maximum running slope on ramps, 36-inch minimum width, detectable warnings at base.
3. Stormwater Review: Curb placement affects sheet-flow direction. The EPA NPDES Construction General Permit requires that any change to the drainage pattern on a site over 1 acre be reviewed before construction.

Plan Your Concrete Curb Install

Concrete curb is a 20 to 30 year investment in your parking lot's edge. The right profile, the right mix, and the right install method protect the asphalt, the landscaping, and the pedestrians for decades. Our crew has slipformed and hand-formed curb on more than 200 commercial sites across Oregon — from Hood River to Eugene — and we ground every spec we publish in real installs.

Cojo provides commercial concrete curb installation across the I-5 corridor and the Hood River Valley, including slipform production, hand-formed radii, ADA ramp integration, and stormwater-compliant drainage curbing. Get a custom quote for your site, or learn how we plan a how to pour a concrete curb installation from subgrade to cure.

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