- 1). Mark the trench in the concrete by spray painting the outline of the trench onto the concrete.
- 2). Hold the jackhammer with a firm grip and place the tip along one of the lines, leaning it slightly in toward you.
- 3). Start the jackhammer and dig into the concrete, guiding the jackhammer toward the center of the trench. Continue to keep a firm hold on the jackhammer but don't push down on it.
- 4). Stop the jackhammer when you break through the bottom of the slab. Remove the concrete chunks from the trench.
- 5). Continue to dig the trench with the jackhammer. If the trench is wider than a few feet, work on one side until the trench is halfway done and then move to the other side.
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