Groover A hand tool featuring a V-shaped blade used to tool control joints directly into freshly poured concrete to prevent random surface cracking.
Concrete naturally shrinks and cracks as it cures. A groover is used to create neat, straight control joints every 5 feet, which is the standard spacing for NYC sidewalk flags. By scoring a line at least one-quarter of the slab's depth, the groover creates a weak plane where the concrete can safely crack out of sight. This keeps the sidewalk looking clean and organized, preventing random, jagged cracks that lead to DOT violations.
Frequently Asked Questions About Groover
What is a groover?
A hand tool with a V-shaped blade used to form control joints in fresh concrete.
How deep should a tooled joint be?
Deep enough to create a genuine weakened plane, commonly about one quarter of the slab depth.
What spacing is used on NYC sidewalks?
Joints generally follow the standard flag layout, around five feet, matching the familiar sidewalk grid.
Why not let concrete crack naturally?
Random jagged cracks look poor and can open into cited defects. Joints direct the crack to a straight line below the groove.