How Do You Cut Concrete Blocks?

To cut concrete blocks, mark the cut all the way around with chalk, score the cut with a hammer and chisel, and then set the block on sturdy, level ground. Hold a chisel perpendicular to the block at the score mark, and sharply hit the chisel with a 6-pound sledgehammer.

  1. Mark the cut

    Measure the location for the cut, and mark it with a piece of chalk against a straightedge. Mark the cut all the way around the block.

  2. Don safety equipment

    Put on safety goggles, heavy-duty gloves and a dust mask to protect yourself while cutting the block.

  3. Score the cut

    Hold a chisel perpendicular to the block at the chalk line. Gently strike the chisel with a hammer to a depth of about 1/8 inch. Move the chisel along the line until the entire cut mark is scored to a depth of 1/8 inch.

  4. Set up the cut

    Place the block on the ground in a relatively level, sturdy position. Hold a cold chisel in the center of the scored line at the top of the block. Keep the chisel perpendicular to the block and lined up with the score mark.

  5. Strike the chisel

    Hold a 6-pound sledgehammer near the head. Strike the chisel with a sharp blow. If the block does not cut all the way through, strike a second time.