Cutting cement block. Make a series of passes until you have cut through the concrete block. For concrete or less in depth circular saws and cut off saws can do the trick. How to cut concrete. If the cinder block isnt quite cut though make another 2 or 3 cuts to finish bisecting it.
See how to modify or split blocks from the ab courtyard collection by allan block. Learn how to replace a rusted out steel door with a wider unit in a masonry wall. Fasten on the closer and adjust it. If youre using 1 hand to stabilize the block while your cut keep your fingers out of the way of the saw.
If you want to install a door or window in a wall made of cinder blocks you will need to cut a hole through the wall first. Cutting a hole through a cinder block wall is a messy and time consuming project and it requires safety equipment such as ear plugs a respirator and eye protection. Cut around the entire block with the saw then adjust it so it will cut 14 inch to 12 inch deeper into the block. A power saw produces a cleaner more even cut than does chiseling.