Start with the approved cross-section and split every transition

Calculate cross-sectional area first

Pour Ready combines a rectangular curb area with either a uniform rectangular gutter or a sloped trapezoidal gutter. Multiply the combined area by the run length.

Keep curb height in the intended vertical unit and gutter dimensions in inches or centimeters as shown by the calculator. Unit mistakes are especially easy when field details mix feet and inches.

Use the standard drawing as the input source

Municipal, development, or DOT details may prescribe curb face, width, gutter pan, slopes, reinforcement, base, joints, concrete, and finish. Enter those dimensions rather than selecting a convenient generic profile. Right-of-way work commonly requires permits and inspection.

Separate every nonuniform segment

Driveway depressions, curb ramps, catch basins, inlet throats, transitions, curb returns, radii, tapers, and terminations change the cross-section. Measure each as a separate segment or use the quantity method specified by the project. Do not apply one full-height section through a driveway cut and assume waste will correct it.

Curves change length, not necessarily section

If the cross-section stays constant around a radius, measure the arc length along the project’s designated reference line. Clarify whether plan dimensions follow the curb face, back of curb, gutter flow line, or centerline. Long radii can create a meaningful length difference between those lines.

Placement method affects allowance

Machine-placed curb, hand-formed curb, short interrupted sections, and combined curb-and-gutter pours have different losses and logistics. Pump or machine priming, form leakage, rejected material, cleanup, and frequent starts can matter more than the simple geometry suggests. Choose waste based on placement method and project history.

Drainage is a geometry requirement

The gutter must carry water to the intended outlet without creating low points. Confirm grades, inlet elevations, transitions, and tie-ins before concrete. A correct cubic-yard estimate does not fix an incorrect flow line.

Mix, placement, and curing

Municipal and project standard details typically call for 3,000 to 4,000 PSI concrete for curb and gutter work. In freeze-thaw zones, air-entrained concrete with 5–7% total air content is required to protect against surface scaling caused by ice and deicing chemicals — the entrainment creates microscopic voids that relieve internal pressure when water freezes.

Machine-formed curb is consolidated in one continuous pass during extrusion and requires little additional vibration. Hand-formed sections should be placed in short lifts and consolidated with an internal vibrator before each lift is covered. The gutter pan is the most vulnerable element: it is thin, exposed on two faces, and dries faster than the curb mass. Begin curing it as soon as the surface can be touched without marring. Apply a white-pigmented curing compound immediately after finishing — white pigment reflects solar radiation and prevents heat buildup that accelerates surface drying. Where compound is not available, keep the surface damp under wet burlap held flat against the gutter pan for at least 7 days.

Curb and gutter reference

Curb-and-gutter work lives in the public right-of-way, so the controlling municipal detail outranks any general value. The planning figures below reflect common DOT and ACI practice for residential and light-commercial sitework.

Step by step: forming curb and gutter

Whether hand-formed or slipformed, the gutter pan is the part that fails first if curing is delayed. This sequence follows DOT sitework and ACI practice.

1. Prepare the subgrade and base. Compact the subgrade to about 95% standard Proctor density and place a 4-inch granular base of clean stone or gravel to a true line and grade.
2. Set forms or slipform. Use rigid 2-inch lumber staked to line for hand-formed work, or run a slipform machine for continuous placement, checking the flow-line grade as you go.
3. Place and consolidate. Fill in lifts and consolidate with an internal vibrator, taking care not to touch the form faces or disturb the subgrade and pull fines into the mix.
4. Shape and tool the gutter pan. Strike the curb face and tool the gutter pan to hold at least a 2% slope so water runs to the outlet without ponding.
5. Joint at 10–15 feet. Tool or saw contraction joints every 10 to 15 feet, and place expansion joints at structures, inlets, and curb returns.
6. Finish and edge. Apply a light broom or float texture and edge the lip and joints for durability.
7. Cure immediately. Apply a white-pigmented curing compound right after finishing — the thin gutter pan dries fastest and scales first if curing waits.