What are control/expansion/tension joints and where should they be?
Concrete will crack over time. Concrete control joints are either hand tooled, saw-cut, or keyway lines in the concrete that provide a weak area across the concrete to release tension caused by shrinking, movement, etc. In other words, these joints give the concrete a place to crack. Control joints if done correctly should be spaced about one and a half times the narrower width of the concrete up to twelve feet apart. Control lines should be spaced no farther than 12 to 14 feet apart in every direction for driveways and patios.
