How to Cut a Concrete Wall Vertically

Draw a vertical cut line on the wall in the location where you want to cut it. To ensure the vertical line is straight, drop a chalk line tool from the top of the wall and then push it against the wall at the bottom. Place a level beside the string to ensure it is level and then snap the chalk line against the concrete.

Protect the surrounding area if the concrete wall is in or near a living area. Hang sheets of plastic up over all doors and other openings using painter's tape. This prevents dust from entering other areas of the home. If the concrete wall is outdoors, skip this step.

Don heavy work gloves, a dust mask, ear plugs and protective eyewear. Install a masonry saw blade into a circular saw and plug the saw into an electrical outlet.

Place the saw at the top of the concrete wall, using a stepladder if required. Squeeze the trigger and push the blade into the chalk line by 1/4 to 1/2 inch. Pull the saw blade slowly down the wall until you reach the bottom.

Screw the hose of a compressor to the air line valve on a concrete chain saw. Set the pressure on the compressor to a minimum of 20 pounds per square inch, or psi. Attach a garden hose to the water inlet valve located just above or below the air valve and turn the hose on.

Start the concrete chain saw and push the tip against a portion of the chalk line, but not at the top of the wall. Starting the cut in the center of the wall creates a straighter line. Push the saw tip in until it penetrates the wall.

Pull it gently all the way down until you reach the floor or the end of the desired cut line. Pull the saw out and release the trigger.

Place the top of the saw back at the starting location and squeeze the trigger while moving the blade upward to cut through the remaining top portion of the wall.