Civil · C-KY6MK

Joint Intervals Table

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Concrete sidewalks and flatwork utilize score joints, contraction joints, and expansion or isolation joints to control cracking and movement. Score joints feature a one-eighth to one-quarter inch width with a one-quarter inch typical radius. Contraction joints extend to a depth of D/3 with a one-eighth to one-quarter inch width and a one-quarter inch radius. Expansion and isolation joints incorporate a three-eighth inch fiber expansion board with a backer rod, a joint sealer, and interface with drainage structures, manholes, footings, or sidewalks and driveways. The joint intervals table specifies a spacing of five feet typical for score joints at locations shown on plans, fifteen feet maximum for contraction joints at the end of ramps and driveways, and two hundred feet for expansion and isolation joints at points of tangency and at ends of each driveway or other fixed objects, noting that monolithic curb and sidewalk shall be forty-five feet maximum. Notes permit contraction joints in place of score joints, construction cold joints in place of contraction joints, and specify a medium broom finish with no tool marks.

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