What is curb and gutter in construction?

Linear feet, broken out by section type, because that is how crews price and place it. Cubic yards show up secondarily: estimators convert the lf to concrete volume to order material and to sanity check the takeoff, since each section detail has a fixed cross-section. If the cy total looks wildly off against the lf at a known cf per lf, something in the takeoff is wrong.

A slipform curb machine extrudes the section continuously behind string line or stringless guidance, covering long runs fast with a small crew. Hand-forming means setting forms, pouring, and finishing by hand, which is unavoidable on tight radii, short island returns, transitions, closure pours, and repairs. Hand work can cost half again or more per lf, so the machine versus hand split belongs in the takeoff, not buried in an average.

A 6 inch vertical curb with a 24 inch gutter pan is a common commercial section, and it is the one the detail callouts on most civil C-sheets point to. Roll, ribbon and depressed curb vary from it: roll curb lowers the face so vehicles can cross it, ribbon curb drops the separate pan, and depressed curb flattens at drive entrances and accessible ramps. Treat these as common practice rather than a standard, because the governing dimension always comes from the section detail on the plans.

No. Sidewalk, asphalt paving, and aggregate base are separate takeoff lines and often separate subcontracts, even though they meet at the curb. What the curb scope does include is its own base preparation, the depressed and transition sections at driveways and ADA ramps, and expansion joints. Coordinate grades carefully: curb usually pours before the asphalt, and the gutter flow line sets the drainage the paving must match.