This standard concrete curb detail shows a cast-in-place concrete curb bearing on a four-inch subbase course with adjacent pavement on one side and backfill up to the top of the curb on the other. The curb profile features a top width of six inches with a three-eighths-inch radius on the back edge and a three-quarters-inch radius on the front edge, sloping toward the roadway at two percent. The overall height is sixteen inches with a base width of nine inches, and a variable curb exposure dimension designated as E is set typically to six inches. Contraction joints are specified at a maximum spacing of fifteen feet and at ramps, while expansion joints are required at a maximum spacing of two hundred feet at points of tangency and driveway ends.
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