Step 5 insert the masonry saw blade in one of the holes and cut along the line.
How to cut a doorway in a concrete block wall.
One way is to face the concrete block opening with treated 2 by 10 material.
If your cut doesn t need to be exact use a cold chisel and hand sledge to cut the concrete.
Choose which side you will start with and punch a hole in the other side with a sledgehammer which will help draw concrete dust away from you as you cut through the wall.
A circular saw with a masonry blade can also be used to either score or completely cut through the block.
Step 4 re form the blocks as needed.
When you get near the edges of the opening you may wish to switch to a masonry chisel and hammer to prevent accidental damage to the surrounding walls.
Use a sledge hammer to break through the concrete inside the scribed lines.
Knock the first one out in the centre then use a multipurpose handsaw to cut the mortar and remove the blocks.
The concrete cutting contractor used a hammer drill to drill and bolt two parallel metal rails to the concrete wall.
A huge water cooled cutting saw attaches to each rail and is slowly moved up and down the rails.
Each time the saw makes a full pass up and down the contractor increases the depth of the saw blade so that it eventually cuts through a 10 concrete wall.
Score the length of the cut three or four times with the chisel.
Removing all the blocks taking outside cutting and re fitting the halves i guess it ll all be tidied up afterwards with plaster etc.
Cutting the foundation wall.
In the photo above the right side of the right vertical rail has been cut.