Cutting concrete blocks can be difficult if you don’t have the tools or experience to back it up. However, there is an array of methods out there for the average DIYer.
The technique that you use should align with your skill level and the type of concrete block that you are cutting. Different blocks handle cutting differently, so making sure you find the right method will ensure that you achieve a clean finish.
Continue reading as we delve into some useful methods for cutting concrete blocks you can implement to do so successfully.
How to Cut Dense Concrete Blocks
Dense concrete blocks are designed for strength and robustness, so power tools are the best approach.
When working with these blocks, mark out the cut line using a pencil and a straight edge. Use an angle grinder with a diamond masonry blade to score along the mark. A shallow first pass will help guide the tool, while also preventing chipping.
Use slow and deliberate passes, letting the blade work through at its own pace. It is advisable to use a masonry saw, which will provide you with an even cleaner finish. If possible, line up the blade and allow the saw to steadily drop through.
Consistent control is key here because dense blocks generate heat quickly. This method will enable you to achieve a precise, professional finish for structural work or visible edges.
Cutting Breeze Blocks
Breeze blocks are much easier to cut due to being lighter and brittle. You can achieve a clean cut with breeze blocks by marking the line, then using a bolster chisel to score across the face.
You should only need a handful of firm taps to establish a groove, because they split in the way you would expect.
Rotate the block and repeat the scoring on each side to guide the break. Once the groove wraps all the way around, you can place the bolster in your top line before striking it with a hammer. Breeze blocks tend to break cleanly along the scored path, so this is a quick and easy method for various projects, such as garden walls, planters, and non-load-bearing work.
How to Cut Concrete Blocks by Hand
You may prefer to work without power tools, or you may only be cutting a small number of concrete blocks. Either way, cutting by hand helps achieve an accurate finish without the noise and dust that power tools produce.
Once you have marked your line, use a wide masonry bolster to chip a shallow track along it. From there, make sure that you maintain a consistent angle and work your way around all sides of the block. This is vital, as it will control the eventual break.
With the guide established, deliver firm blows to split the block along the line. Hand cutting doesn’t produce a perfectly machined edge, but it will give you excellent control and is a great method for shaping blocks to fit tight corners.
How to Cut Concrete Blocks Without a Saw
You may cut concrete blocks without a saw due to noise restrictions, limited tools, or because you are working in a confined space.
Using controlled splitting techniques is a good idea here. A popular approach is to score your line deeply with a cold chisel, prior to inserting masonry wedges into the groove. Make sure to tap each edge gently in rotation to apply pressure evenly. The gradual force increase encourages blocks to split cleanly along marked lines.
For hollow concrete blocks or lighter blocks, we recommend using a progressive removal method. Chip away the material along the line until the block gives way naturally. While this may take patience, it eliminates the need for powered cutting tools and reduces dust, therefore being ideal for indoor and enclosed work areas.
Quick Summary
The ability to cut concrete blocks doesn’t extend solely to highly skilled professionals with years of experience.
Find a method that works for you, the type of block you are cutting, and the tools that you have available to you. This will help you achieve precise and clean cuts for your project.
If you require any further assistance with concrete blocks, feel free to get in touch.