Score the length of the cut three or four times with the chisel.
How to cut a doorway in a concrete block wall.
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.
In the photo above the right side of the right vertical rail has been cut.
This lumber should be within 1 8 inch of what the width of the concrete block wall is now when you add the thickness of.
Cut through the remaining lines until you have created the opening.
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.
A huge water cooled cutting saw attaches to each rail and is slowly moved up and down the rails.
Step 5 insert the masonry saw blade in one of the holes and cut along the line.
The concrete cutting contractor used a hammer drill to drill and bolt two parallel metal rails to the concrete wall.
One way is to face the concrete block opening with treated 2 by 10 material.
Don t force a blade into a cut.
A circular saw with a masonry blade can also be used to either score or completely cut through the block.
If your cut doesn t need to be exact use a cold chisel and hand sledge to cut the concrete.
Cutting the foundation wall.
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.
Step 4 re form the blocks as needed.