Curb and Gutter Installation: 2026 Combined-Pour Spec Guide
Direct Answer (60 words): Curb and gutter is a combined concrete element with a 6-inch face curb monolithically connected to a 24-inch gutter pan, slipformed in a single pass at 50 to 100 linear feet per hour. The gutter pan slopes 1/4 inch per foot toward the curb face to capture sheet flow. ODOT 00759 governs the standard. Class 4000 concrete and 1/4-inch surface tolerance are required.
Curb and gutter is the workhorse of municipal and commercial-frontage curb work. The combined element sits where the parking lot or roadway meets the perimeter, capturing stormwater in the gutter pan and channeling it along the curb face to the next catch basin. Slipform production lets a single crew place hundreds of feet per day. This guide walks the install sequence we use on commercial work, including a 2,400-foot Salem run from February 2026.
What is curb and gutter?
Curb and gutter is a single concrete element combining a vertical curb with a flat or sloped gutter pan. The gutter pan extends 24 inches from the curb face into the pavement. Stormwater that lands on the pavement sheet-flows toward the gutter, then runs along the gutter to the nearest catch basin.
The U.S. Federal Highway Administration documents curb and gutter as the standard drainage element for commercial-frontage and residential-street pavement edges (FHWA Pavement Design).
Why combine curb and gutter?
Combining the two elements into a single pour produces:
- A monolithic concrete unit (no cold joint between curb and gutter)
- Faster slipform placement (one machine pass)
- Better drainage performance (no pan-curb gap)
- Continuous reinforcement where required
- Easier finish-tolerance verification
What are the standard curb-and-gutter dimensions?
| Component | Standard Spec |
|---|---|
| Curb face height | 6 inches |
| Curb width at top | 6 inches |
| Curb width at bottom | 8 to 10 inches |
| Gutter pan width | 24 inches (commercial), 18 inches (residential) |
| Gutter pan slope | 1/4 inch per foot toward curb face |
| Total cross-section | 30 inches wide x 6 inches face + pan thickness |
How do you prepare the subgrade?
The subgrade for curb and gutter is wider and tighter-tolerance than for plain barrier curb because of the gutter pan.
- Excavate to design grade plus 6 inches for crushed aggregate base.
- Compact subgrade to 95 percent Proctor per ASTM D1557.
- Place crushed aggregate base in 3-inch lifts, compact each lift.
- Trim base to plus or minus 1/4 inch of design grade.
- Verify with string-line. The base must support the full 30-inch cross-section.
What concrete mix design works?
Curb-and-gutter slipform production uses the same Class 4000 mix as standard slipform curb:
| Mix Property | Spec |
|---|---|
| Compressive strength | 4,000 PSI at 28 days |
| Slump | 1 to 2 inches |
| Maximum aggregate | 3/8 to 1/2 inch |
| Air entrainment | 5 to 7 percent (Oregon freeze-thaw) |
| Cement content | 564 to 658 lb/cy |
How do you slipform curb and gutter in a single pass?
A slipform paver with a curb-and-gutter form box places the entire 30-inch cross-section in one pass.
- Stage trucks ahead of the machine. Cycle time should keep the hopper at half-full.
- Engage the form box and drive. The Power Curbers 5700-D walks at 50 to 100 linear feet per hour.
- Watch the form exit. A trailing inspector flags any tearing, sagging, or cap voids.
- Tool joints. A trailing crew member tools control joints every 10 to 15 feet.
- Trail-finish. A finisher walks behind broom-finishing the gutter pan and the curb top.
How does the gutter pan slope work?
The gutter pan slopes 1/4 inch per foot toward the curb face. This 2 percent cross-slope captures sheet flow from the pavement and directs it along the curb-gutter line. The longitudinal slope (along the curb length) is the project's design grade, typically 0.5 to 2 percent toward catch basins.
The combined cross-slope and longitudinal slope produces a controlled drainage path. The U.S. Environmental Protection Agency references this drainage configuration in NPDES stormwater best practices (EPA NPDES).
What about expansion and control joints?
| Joint Type | Spacing | Tooling |
|---|---|---|
| Control joints | Every 10 feet | Sawcut at 4 to 12 hours, depth 1/4 of cross-section |
| Expansion joints | Every 30 to 60 feet (or per radius) | Full-depth gap with 1/2-inch preformed filler |
| Construction joints | At end of pour cycle | Bonded or doweled cold joint |
What about catch-basin tie-ins?
Curb-and-gutter terminates at each catch basin with a transition section:
- Taper the gutter pan into the catch basin throat
- Maintain longitudinal slope through the transition
- Sawcut or form a clean end at the basin frame
- Seal with non-shrink grout
What does the cure schedule look like?
| Time After Pour | Restriction |
|---|---|
| 0 to 24 hours | No traffic, cure compound applied within 30 minutes |
| 1 to 7 days | No vehicle traffic, foot traffic OK |
| 7 to 14 days | Light vehicle traffic acceptable |
| 14 to 28 days | Standard vehicle traffic |
| 28 days | Full design strength, snowplow OK |
Industry Baseline Range for curb and gutter
| Component | Range |
|---|---|
| Standard 6-in curb plus 24-in gutter pan slipformed | $14 to $26 per linear foot |
| Hand-formed at radii | $20 to $36 per linear foot |
| Catch basin tie-in transition | $400 to $900 per basin |
| Mobilization | $1,200 to $3,500 per project |
| QA inspection package | $1,500 to $4,500 per project |
Current Market Reality
Combined curb-and-gutter pricing has climbed 12 to 22 percent over historical baseline since 2024 due to ready-mix freight surcharges, slipform-equipment service rates, and rebar tonnage cost increases. Mobilization-loaded pricing on small jobs under 500 linear feet runs at the high end of the range or above.
Real install reference
In February 2026 we slipformed 2,400 linear feet of 6-inch face curb plus 24-inch gutter pan at a Salem retail center off Lancaster Drive. The crew placed the entire run in two production days using a Power Curbers 5700-D. We tooled control joints every 12 feet, set preformed expansion joints every 36 feet, and tied the gutter pan into 6 catch basins along the run. Final inspection measured 1/8-inch surface tolerance — better than the ODOT 00759 spec.
Frequently Asked Questions
What's the difference between curb and curb-and-gutter? Standard curb is just the vertical concrete element. Curb and gutter combines the curb with a 24-inch gutter pan poured monolithically. The combined element captures and channels stormwater.
What slope does a gutter pan have? 1/4 inch per foot (2 percent) toward the curb face. The longitudinal slope along the gutter length is the project's design grade, typically 0.5 to 2 percent toward catch basins.
Can you slipform curb and gutter in a single pass? Yes. A slipform paver with a curb-and-gutter form box places the full 30-inch cross-section in one pass at 50 to 100 linear feet per hour.
What concrete class does curb and gutter need in Oregon? Class 4000 (4,000 PSI minimum at 28 days) per ODOT 00759. The mix includes 5 to 7 percent entrained air for freeze-thaw exposure.
How does curb and gutter tie into catch basins? The gutter pan tapers into the catch basin throat with a formed transition section. The basin-curb joint seals with non-shrink grout to keep water from infiltrating.
We slipform commercial curb and gutter across Oregon. To plan your project, start with our concrete curb guide, the slipform curb installation guide, or get a quote on curbing in Portland Oregon.