These joints should be cut in a quarter of the depth of the concrete slab during the very beginning of the curing process within 24 hours of the initial pour.
How to cut poured concrete wall.
Drive a nail into the concrete here.
So if your wall is 8 inches wide your two nails should be 8 inches apart.
Close up of cutting a door in a concrete foundation with a wet saw.
If your cut doesn t need to be exact use a cold chisel and hand sledge to cut the concrete.
Once both sides ware cut he used a sledge hammer and some wedges to knock the wall out of position and into the pre dug hole awaiting outside.
Break the concrete wall into small chunks with your preferred tool and let the debris fall to the ground as you work.
Don t force a blade into a cut.
Start at the top of the opening and cut carefully along the lines you made on the wall.
Ignore any rebar you come across and just break the concrete free of the metal.
Score the length of the cut three or four times with the chisel.
This process took approximately one hour to complete.
Line up the blade of a concrete saw over the marks on one side of the wall.
The contractor was able to cut from the house sill framing to the concrete footing at the bottom.
A circular saw with a masonry blade can also be used to either score or completely cut through the block.
Measure out from that nail to where the other face of your wall will be and place another nail.