If your cut doesn t need to be exact use a cold chisel and hand sledge to cut the concrete.
How to cut an opening in a concrete wall.
Don t force a blade into a cut.
Get a friend to hold one end while you hold the other and run the line over the region to be cut.
Double check your marks on both sides of the wall.
How to make cutouts through a concrete wall.
A huge water cooled cutting saw attaches to each rail and is slowly moved up and down the rails.
Lift the line simultaneously from each end and slap it to the ground.
Designate the area of finished concrete to be cut using chalk lines.
Anyway the landord was adding an overhead door for the next tenant and the concrete cutters came in one morning anchored tracks to the wall and ran the rail saws in about 8 hours they had a 12 ft overhead door cut but like above left the concrete in the hole.
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Mark the wall where you plan to make your cuts using a tape measure to verify the exact location and dimensions for the new opening.
A circular saw with a masonry blade can also be used to either score or completely cut through the block.
When you re cutting concrete that is already poured and finished use a chalk line to mark the region.
Repeat step 1 on the other side of the opening.
Score the length of the cut three or four times with the chisel.
The ring saw can cut concrete quickly and accurately with very little setup.
Steel lintels in concrete block walls are placed in the mortar between blocks so the first step will be opening a space for the lintel itself.